WO2020019805A1 - Current source circuit and implementation method therefor - Google Patents

Current source circuit and implementation method therefor Download PDF

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Publication number
WO2020019805A1
WO2020019805A1 PCT/CN2019/084981 CN2019084981W WO2020019805A1 WO 2020019805 A1 WO2020019805 A1 WO 2020019805A1 CN 2019084981 W CN2019084981 W CN 2019084981W WO 2020019805 A1 WO2020019805 A1 WO 2020019805A1
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current
mos tube
circuit
temperature coefficient
gate
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PCT/CN2019/084981
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French (fr)
Chinese (zh)
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耿玮生
郭晓锋
李林喜
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广州金升阳科技有限公司
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Publication of WO2020019805A1 publication Critical patent/WO2020019805A1/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
    • G05F1/463—Sources providing an output which depends on temperature

Definitions

  • the invention relates to the technical field of integrated circuits, in particular to a current source circuit and an implementation method thereof, and in particular to an arbitrary temperature coefficient current source circuit and an implementation method thereof.
  • the commonly used current source circuit is one of the very important circuits in the design of integrated circuits. It provides the necessary bias current for the normal operation of other modules in the chip. Its performance greatly affects the overall performance of the chip.
  • the existing current source circuit usually generates a current with a fixed positive temperature coefficient and a fixed negative temperature coefficient, or superposes two types of temperature coefficient currents to generate an approximately zero temperature coefficient current required by the subsequent stage.
  • the fixed positive temperature coefficient, negative temperature coefficient, or zero temperature coefficient current is constant, because the temperature coefficient is unchanged.
  • this current source circuit often cannot meet the design needs, or the temperature coefficient. Too large or too small temperature coefficient. Therefore, a current source with an arbitrary temperature coefficient is required to better match the temperature characteristics of the subsequent circuit.
  • the object of the present invention is to provide a current source circuit and an implementation method thereof.
  • the current source can be an arbitrary temperature coefficient or have two temperature coefficients in a full temperature range, so as to meet the temperature characteristic requirement of the subsequent stage circuit for the bias current. Its structure is simple, and it can realize high-performance current source with less area.
  • the present invention provides a current source circuit capable of generating an arbitrary temperature coefficient characteristic, including: a first current generating circuit, a second current generating circuit, a first proportional current circuit, a second proportional current circuit, and a first Three-ratio current circuit, where,
  • An input terminal of the first current generating circuit is connected to a power supply voltage VDD, an output terminal of the first current generating circuit is connected to an input terminal of the first proportional current circuit, and the first proportional current circuit outputs a current IP1. ;
  • An input terminal of the second current generating circuit is connected to a power supply voltage VDD, and an output current of an output terminal of the second current generating circuit is subtracted from an output current IP1 of the first proportional current circuit, and is output to a second proportional current.
  • An input terminal of the third proportional current circuit is connected to a zero temperature coefficient current, and an output terminal of the third proportional current circuit outputs a current IP3;
  • the output current IP2 of the second proportional current circuit is added to the output current IP3 of the third proportional current circuit, and a final current is output.
  • the second current generating circuit is a zero temperature coefficient current circuit
  • the second current generating circuit is a positive temperature coefficient current circuit.
  • the positive temperature coefficient current circuit includes a MOS tube PM1, a MOS tube PM2, a MOS tube PM3, a MOS tube PM4, a MOS tube NM1, a MOS tube NM2, a resistor R1, a transistor Q1, and a transistor Q2;
  • the source of MOS tube PM1, the source of MOS tube PM2, the source of MOS tube PM3, and the source of MOS tube PM4 are connected to the supply voltage VCC, the gate of MOS tube PM1, the gate of MOS tube PM2, and MOS tube PM3.
  • the gate of the MOS transistor PM4 is connected to the gate of the MOS transistor PM4.
  • the drain of the MOS transistor PM2 is connected to the gate of the MOS transistor PM2 and connected to the drain of the MOS transistor NM2.
  • the drain of the MOS transistor PM1 is connected to the drain of the MOS transistor NM1.
  • the gate of MOS tube NM1 is connected to the drain of MOS tube NM1 and the gate of MOS tube NM2, the source of MOS tube NM1 is connected to the emitter of transistor Q1, and the source of MOS tube NM2 is connected to one end of resistor R1.
  • the other end of resistor R1 is connected to the emitter of transistor Q2; the base of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q1 is connected to the collector of transistor Q2; the drain of MOS transistor PM3 is used as a positive temperature coefficient current circuit
  • the output terminal outputs a current IPTAT1, and the drain of the MOS tube PM4 outputs a positive temperature coefficient current IPTAT2 to the zero temperature coefficient current circuit.
  • the zero temperature coefficient current circuit includes a resistor R2, a transistor Q3, an operational amplifier, a MOS tube NM3, a resistor R3, and a current mirror unit composed of a MOS tube PM5, a MOS tube PM6, and a MOS tube PM7;
  • the base of the transistor Q3 and the collector are grounded, and the emitter of the transistor Q3 is connected to one end of the resistor R2; the other end of the resistor R2 is connected to the positive temperature coefficient current IPTAT2 and output to the positive input end of the operational amplifier; the operational amplifier The negative input terminal is connected to the source of the MOS tube NM3 and one end of the resistor R3, and the other end of the resistor R3 is grounded; the output end of the operational amplifier is connected to the gate of the MOS tube NM3; the drain of the MOS tube NM3 Connected to the drain of MOS tube PM5 and the gate of MOS tube PM5, the gate of MOS tube PM5, the gate of MOS tube PM6 and the gate of MOS tube PM7 are connected, the source of MOS tube PM5, and the gate of MOS tube PM6 The source and the source of the MOS tube PM7 are connected to the supply voltage VDD in common.
  • the drain of the MOS tube PM6 is used as the output terminal of the zero temperature coefficient current circuit.
  • the first proportional current circuit is composed of a mirror image of the MOS tube NM4 and the MOS tube NM5; the source of the MOS tube NM4 and the source of the MOS tube NM5 are grounded; The input terminal of a proportional current circuit; the gate of the MOS tube NM5 is connected to the gate of the MOS tube NM4, and the drain of the MOS tube NM5 outputs the current IP1;
  • the second proportional current circuit is composed of the MOS tube NM6 and the MOS tube NM7.
  • the source of the MOS tube NM6 and the source of the MOS tube NM7 are grounded.
  • the drain and the gate of the MOS tube NM6 are connected and used as the second proportional current.
  • the input end of the circuit; the gate of the MOS tube NM7 is connected to the gate of the MOS tube NM6, and the drain of the MOS tube NM7 outputs the current IP2;
  • the third proportional current circuit is composed of the MOS tube NM8 and the MOS tube NM9.
  • the source of the MOS tube NM9 and the source of the MOS tube NM8 are grounded.
  • the drain and the gate of the MOS tube NM9 are connected and used as the third proportional current.
  • the input end of the circuit; the gate of the MOS tube NM8 is connected to the gate of the MOS tube NM9, and the drain of the MOS tube NM8 outputs an IP3 current.
  • the present invention also provides a method for implementing a current source circuit, which realizes any positive temperature coefficient current or a current with two temperature coefficients in a full temperature range, including the following steps:
  • Step 1 The positive temperature coefficient current generating circuit generates two positive temperature coefficient currents IPTAT1 and IPTAT2.
  • Step 2 output the positive temperature coefficient current IPTAT2 to the zero temperature coefficient current generating circuit, and the zero temperature coefficient current generating circuit generates two zero temperature coefficient currents IZTC1 and IZTC2;
  • Step three use the first proportional current circuit to mirror the zero temperature coefficient current IZTC1 as the current IP1; and subtract it from the positive temperature coefficient current IPTAT1 to obtain the current IP21 input to the input terminal of the second proportional current circuit;
  • Step four use the second proportional current circuit to mirror the IP21 current as the current IP2;
  • Step 5 Use a third proportional current circuit to mirror the zero temperature coefficient current IZTC2 as the current IP3; the IP2 current and the IP3 current are added to generate and output the arbitrary positive temperature coefficient current or have two temperatures in the entire temperature range Coefficient of current.
  • Achieving any negative temperature coefficient current or current with two temperature coefficients over the full temperature range includes the following steps:
  • Step 1 The positive temperature coefficient current generating circuit generates two positive temperature coefficient currents IPTAT1 and IPTAT2.
  • Step 2 output the positive temperature coefficient current IPTAT2 to the zero temperature coefficient current generating circuit, and the zero temperature coefficient current generating circuit generates two zero temperature coefficient currents IZTC1 and IZTC2;
  • Step three use the first proportional current circuit to mirror the positive temperature coefficient current ITPAT1 as the current IP1; and subtract it from the zero temperature coefficient current IZTC1 to obtain the current IP21 input to the input terminal of the second proportional current circuit;
  • Step four use the second proportional current circuit to mirror the IP21 current as the current IP2;
  • Step 5 Use a third proportional current circuit to mirror the zero temperature coefficient current IZTC2 as the current IP3; the IP2 current and the IP3 current are added to generate and output the arbitrary negative temperature coefficient current or have two temperatures in the entire temperature range Coefficient of current.
  • a current source circuit and an implementation method thereof according to the present invention generate a desired arbitrary temperature coefficient current by recombining a positive temperature coefficient current and a zero temperature coefficient current.
  • the circuit is simple to implement and is suitable for use in the future. Generation of various temperature coefficient currents.
  • FIG. 1 is a schematic block diagram of a first embodiment of the present invention
  • FIG. 2 is a circuit structural diagram of a first embodiment of the present invention
  • FIG. 4 is a characteristic curve diagram of a positive temperature coefficient output current according to a first embodiment of the present invention.
  • FIG. 5 is a circuit configuration diagram of a second embodiment of the present invention.
  • FIG. 6 is a graph of output current characteristics with two temperature coefficients according to a second embodiment of the present invention.
  • FIG. 7 is a characteristic curve diagram of a negative temperature coefficient output current according to a second embodiment of the present invention.
  • FIG. 1 is a schematic block diagram of a current source circuit according to an embodiment of the present invention. As shown in FIG. 1, it includes a first current generating circuit 10, a second current generating circuit 11, a first proportional current circuit 12, a second proportional current circuit 13, a third proportional current circuit 14, a current subtraction node 13A, and a current phase Add node 14A.
  • the first current generating circuit 10 outputs a first current IZTC1 and a third current IZTC2 with zero temperature coefficient; the second current generating circuit outputs a second current IPTAT1 which is proportional to the temperature; the first proportional current circuit configures the first current IZTC1 as required After the scaling factor, the IP1 current is output; the second current IPTAT1 and the first proportional current circuit output IP1 are collected at node 13A, subtracted and output the IP21 current to the second proportional current circuit.
  • the second proportional current circuit configures the IP21 current to a required proportionality factor, and then outputs the IP2 current.
  • the third proportional current circuit configures the third current IZTC2 to a required proportionality factor, and outputs an IP3 current.
  • the IP2 current and the IP3 current are collected at the node 14A, and after adding, the required positive temperature coefficient current IOUT is output.
  • FIG. 2 is a circuit configuration diagram of the first embodiment.
  • the second current generating circuit 11 generates positive temperature coefficient currents IPTAT1 and IPTAT2, including MOS transistors PM1, PM2, PM3, PM4, NM1, NM2, resistors R1, and transistors Q1 and Q2.
  • the source of PM1, the source of PM2, the source of PM3, and the source of PM4 are connected to the supply voltage VCC.
  • the gate of PM1, the gate of PM2, the gate of PM3, and the gate of PM4 are connected, and the drain of PM2 is connected.
  • the electrode is connected to the drain of NM2 after being connected to the gate of PM2; the drain of PM1 is connected to the drain of NM1, the gate of NM1 is connected to the drain of NM1 and the gate of NM2, and the source of NM1 is connected to Q1
  • the emitter of NM2 is connected to one end of resistor R1, and the other end of resistor R1 is connected to the emitter of Q2; the base of Q1 is connected to the base of Q2, and the collector of Q1 is connected to the collector of Q2; the drain of PM3 Output the second current IPTAT1 to the current subtraction node 13A, and the drain of PM4 outputs the current IPTAT2 to the first current generation circuit;
  • IPTAT1 and IPTAT2 are positive temperature coefficient currents.
  • the first current generating circuit 10 generates zero temperature coefficient currents IZTC1 and IZTC2.
  • the first current generating circuit 10 includes MOS transistors PM5, PM6, PM7, NM3, operational amplifier OPA, resistors R2 and R3, NPN transistor Q3, the base and collector of transistor Q3 are grounded, and the emitter of transistor Q3 is connected to one end of R2 ;
  • the other end of R2 is connected to the current IPTAT2 and is connected to the positive input end of the operational amplifier;
  • the negative input end of the operational amplifier is connected to the source of MOS tube NM3 and one end of R3, and the other end of R3 is grounded;
  • the operational amplifier The output end is connected to the tube gate of NM3;
  • the drain of NM3 is connected to the drain and gate of PM5, the gate of PM5, the gate of PM6 and the gate of PM7 are connected, the source of PM5 and the source of PM6
  • the source of PM7 is connected to the supply voltage VDD.
  • the drain of PM6 outputs the first current IZTC1 to the input terminal of the first proportional current circuit
  • the drain of PM7 outputs the third current IZTC2 to the input terminal of the third proportional current circuit.
  • the PM5 tube is mirrored to the sixth PMOS tube and the seventh PMOS tube, and outputs the first and second zero temperature coefficient currents; the fifth PMOS tube, the sixth PMOS tube, and the seventh PMOS tube form a current mirroring unit.
  • the second current generating circuit generates a voltage reference circuit that is proportional to the temperature IPTAT2 and resistor R2 and transistor Q3; IPTAT2 is connected to one end of R2 resistor; the other end of R2 resistor is connected to the emitter of transistor Q3, and the base and collector of transistor Q3 are grounded; Voltage VREF1 proportional to temperature;
  • the reference voltage VREF1 is output to the OPA positive terminal.
  • the output of the op amp is connected to the gate of the NMOS tube NM3.
  • the NM3 source is connected to one end of the resistor R3 and output to the negative phase input of the op amp.
  • the other end of the resistor R3 is grounded.
  • the drain of N3 is used as the current.
  • the current mirror unit consists of three PMOSs PM5, PM6 and PM7.
  • the device size is set according to 1: 1: 1.
  • the output currents IZTC1 and IZTC2 are as follows:
  • R1 and R2 are the same type of resistor, and their temperature characteristics are the same; k 'is a temperature independent coefficient.
  • the first proportional current circuit 12 is composed of a fourth NMOS transistor NM4 and a fifth NMOS transistor NM5.
  • the second proportional current circuit 13 is composed of a sixth NMOS transistor NM6 and a seventh NMOS transistor NM7.
  • the source of NM6 and the source of NM7 are grounded.
  • the drain of NM6 is connected to the gate and connected to the second current generating circuit current IPTAT1 and the current subtracting node 13A of the first proportional current circuit output IP1;
  • the third proportional current circuit 14 is composed of an eighth NMOS transistor NM8 and a ninth NMOS transistor NM9.
  • the source of NM9 and the source of NM8 are grounded.
  • the drain and gate of NM9 are connected and connected to the first current generating circuit current IZTC2; the gate of NM8 is connected to the gate of NM9, and the drain of NM8 mirrors the output IP3 current;
  • the output of the second proportional current circuit IP2 and the third proportional current circuit IP3 are collected at the node 14A, and the output current IOUT is added after the addition.
  • IP21 currents with different temperature characteristics can be obtained:
  • IP2 currents with different temperature coefficients can be obtained:
  • FIG. 1 Another embodiment of the present invention. Its structural block diagram is the same as that of the first embodiment, as shown in FIG. 1. It includes a first current generating circuit 10, a second current generating circuit 11, a first proportional current circuit 12, a second proportional current circuit 13, a third proportional current circuit 14, a current subtraction node 13A, and a current addition node 14A.
  • the difference from the first embodiment is that the first current generating circuit 10 generates a positive temperature coefficient current, the first current IPTAT1 and the current IPTAT2; the second current generating circuit 11 generates a zero temperature coefficient second current IZTC1 and a current IZTC2; the first ratio The input current of the current circuit is the first current IPTAT1; the input current IP21 of the second proportional current circuit is obtained by subtracting the output IZTC1 of the second current generating circuit from the output IP1 of the first proportional current circuit; the input current IZTC2 of the third proportional current circuit is obtained by the second Generated by the current generation circuit.
  • the output current IOUT is still obtained by adding the IP2 current and the IP3 current, and the output current IOUT is a negative temperature coefficient current.
  • FIG. 5 is a circuit configuration diagram of the second embodiment.
  • the first current generating circuit 10 is a positive temperature coefficient current generating circuit, and the structure is the same as that of the second current generating circuit of the first embodiment, and the principle is not described again.
  • the second current generating circuit 11 is a zero temperature coefficient current generating circuit, which is the same as the first current generating circuit of the first embodiment, and the principle is not described again.
  • the structure of the third proportional current circuit 14 is completely the same as that of the first embodiment. Its output current IP3 is
  • the output of the second proportional current circuit IP2 and the third proportional current circuit IP3 are collected at the node 14A, and the output current IOUT is added after the addition.
  • IP21 currents with different temperature characteristics can be obtained:
  • IP2 currents with different temperature coefficients can be obtained:

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Abstract

A current source circuit and an implementation method therefor, which can generate a current with an arbitrary temperature coefficient, and can also generate a current having two temperature coefficients in a full temperature range, meeting the temperature property requirement of a post-stage circuit for a bias current. The current source circuit comprises: a first current generating circuit (10) for generating a positive temperature coefficient current or a zero temperature coefficient current; and a second current generating circuit (11) for generating a zero temperature coefficient current or a positive temperature coefficient current. The result of the subtraction between the two temperature coefficient currents is obtained, subjected to proportional adjustment, and then added to the zero temperature coefficient current, so as to generate the final desired output current.

Description

一种电流源电路及其实现方法Current source circuit and implementation method thereof 技术领域Technical field
本发明涉及集成电路技术领域，具体涉及一种电流源电路及其实现方法，特别是涉及一种任意温度系数电流源电路及其实现方法。The invention relates to the technical field of integrated circuits, in particular to a current source circuit and an implementation method thereof, and in particular to an arbitrary temperature coefficient current source circuit and an implementation method thereof.
背景技术Background technique
常用的电流源电路是集成电路设计中非常重要的电路之一，它为芯片中其它模块的正常工作提供了必要的偏置电流，它的性能在很大程度上影响着芯片的整体性能。The commonly used current source circuit is one of the very important circuits in the design of integrated circuits. It provides the necessary bias current for the normal operation of other modules in the chip. Its performance greatly affects the overall performance of the chip.
现有电流源电路通常是产生具有固定正温度系数、固定负温度系数电流，或者对两种温度系数电流进行叠加，产生后级需要的近似零温度系数电流。The existing current source circuit usually generates a current with a fixed positive temperature coefficient and a fixed negative temperature coefficient, or superposes two types of temperature coefficient currents to generate an approximately zero temperature coefficient current required by the subsequent stage.
在实际应用中固定的正温度系数、负温度系数或者零温度系数电流，因为温度系数不变，在后级电路温度特性变化的情况下，这种电流源电路往往无法满足设计需要，或者温度系数过大、或者温度系数过小。因此，需要有任意温度系数的电流源，这样才能更好的匹配后级电路的温度特性需求。In practical applications, the fixed positive temperature coefficient, negative temperature coefficient, or zero temperature coefficient current is constant, because the temperature coefficient is unchanged. When the temperature characteristics of the subsequent circuit are changed, this current source circuit often cannot meet the design needs, or the temperature coefficient. Too large or too small temperature coefficient. Therefore, a current source with an arbitrary temperature coefficient is required to better match the temperature characteristics of the subsequent circuit.
发明内容Summary of the Invention
本发明目的是提供一种电流源电路及其实现方法，此电流源能够是任意温度系数或者在全温度范围内具有两种温度系数，用以满足后级电路对偏置电流的温度特性需求。其结构简单，能够利用较少的面积实现高性能电流源。The object of the present invention is to provide a current source circuit and an implementation method thereof. The current source can be an arbitrary temperature coefficient or have two temperature coefficients in a full temperature range, so as to meet the temperature characteristic requirement of the subsequent stage circuit for the bias current. Its structure is simple, and it can realize high-performance current source with less area.
为解决上述技术问题，本发明提供的一种能够产生任意温度系数特性的电流源电路，包括：第一电流产生电路，第二电流产生电路，第一比例电流电路，第二比例电流电路和第三比例电流电路，其中，In order to solve the above technical problems, the present invention provides a current source circuit capable of generating an arbitrary temperature coefficient characteristic, including: a first current generating circuit, a second current generating circuit, a first proportional current circuit, a second proportional current circuit, and a first Three-ratio current circuit, where,
所述第一电流产生电路的输入端连接供电电压VDD，所述第一电流产生电路的输出端与所述的第一比例电流电路的输入端相连；所述的第一比例电流电路输出电流IP1；An input terminal of the first current generating circuit is connected to a power supply voltage VDD, an output terminal of the first current generating circuit is connected to an input terminal of the first proportional current circuit, and the first proportional current circuit outputs a current IP1. ;
所述第二电流产生电路的输入端连接供电电压VDD，所述第二电流产生电路的输出端的输出电流与所述的第一比例电流电路的输出电流IP1相减，并输出到第二比例电流电路的输入端，第二比例电流电路的输出端输出电流IP2；An input terminal of the second current generating circuit is connected to a power supply voltage VDD, and an output current of an output terminal of the second current generating circuit is subtracted from an output current IP1 of the first proportional current circuit, and is output to a second proportional current. The input end of the circuit and the output end of the second proportional current circuit output current IP2;
所述第三比例电流电路的输入端接零温度系数电流，所述第三比例电流电路 的输出端输出电流IP3；An input terminal of the third proportional current circuit is connected to a zero temperature coefficient current, and an output terminal of the third proportional current circuit outputs a current IP3;
所述第二比例电流电路的输出电流IP2与第三比例电流电路的输出电流IP3相加，并输出最终电流。The output current IP2 of the second proportional current circuit is added to the output current IP3 of the third proportional current circuit, and a final current is output.
当所述第一电流产生电路为正温度系数电流电路时，所述的第二电流产生电路为零温度系数电流电路；When the first current generating circuit is a positive temperature coefficient current circuit, the second current generating circuit is a zero temperature coefficient current circuit;
当所述第一电流产生电路为零温度系数电流电路时，所述的第二电流产生电路为正温度系数电流电路。When the first current generating circuit is a zero temperature coefficient current circuit, the second current generating circuit is a positive temperature coefficient current circuit.
优选的，所述的正温度系数电流电路包括MOS管PM1、MOS管PM2、MOS管PM3、MOS管PM4、MOS管NM1、MOS管NM2、电阻R1、三极管Q1和三极管Q2；Preferably, the positive temperature coefficient current circuit includes a MOS tube PM1, a MOS tube PM2, a MOS tube PM3, a MOS tube PM4, a MOS tube NM1, a MOS tube NM2, a resistor R1, a transistor Q1, and a transistor Q2;
MOS管PM1的源极、MOS管PM2的源极、MOS管PM3的源极和MOS管PM4的源极连接到供电电压VCC，MOS管PM1的栅极、MOS管PM2的栅极、MOS管PM3的栅极和MOS管PM4的栅极相连接，MOS管PM2的漏极与MOS管PM2的栅极连接后接到MOS管NM2的漏极；MOS管PM1的漏极连接MOS管NM1的漏极，MOS管NM1的栅极分别与MOS管NM1的漏极、MOS管NM2的栅极相连接，MOS管NM1的源极连接到三极管Q1的发射极，MOS管NM2的源极连接电阻R1的一端，电阻R1的另一端连接三极管Q2的发射极；三极管Q1的基极连接三极管Q2的基极，三极管Q1的集电极与三极管Q2的集电极接地；MOS管PM3的漏极作为正温度系数电流电路的输出端输出电流IPTAT1，MOS管PM4的漏极输出正温度系数电流IPTAT2给所述的零温度系数电流电路。The source of MOS tube PM1, the source of MOS tube PM2, the source of MOS tube PM3, and the source of MOS tube PM4 are connected to the supply voltage VCC, the gate of MOS tube PM1, the gate of MOS tube PM2, and MOS tube PM3. The gate of the MOS transistor PM4 is connected to the gate of the MOS transistor PM4. The drain of the MOS transistor PM2 is connected to the gate of the MOS transistor PM2 and connected to the drain of the MOS transistor NM2. The drain of the MOS transistor PM1 is connected to the drain of the MOS transistor NM1. The gate of MOS tube NM1 is connected to the drain of MOS tube NM1 and the gate of MOS tube NM2, the source of MOS tube NM1 is connected to the emitter of transistor Q1, and the source of MOS tube NM2 is connected to one end of resistor R1. The other end of resistor R1 is connected to the emitter of transistor Q2; the base of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q1 is connected to the collector of transistor Q2; the drain of MOS transistor PM3 is used as a positive temperature coefficient current circuit The output terminal outputs a current IPTAT1, and the drain of the MOS tube PM4 outputs a positive temperature coefficient current IPTAT2 to the zero temperature coefficient current circuit.
优选的，所述零温度系数电流电路包括电阻R2、三极管Q3、运算放大器、MOS管NM3、电阻R3以及由MOS管PM5、MOS管PM6和MOS管PM7组成的电流镜像单元；Preferably, the zero temperature coefficient current circuit includes a resistor R2, a transistor Q3, an operational amplifier, a MOS tube NM3, a resistor R3, and a current mirror unit composed of a MOS tube PM5, a MOS tube PM6, and a MOS tube PM7;
三极管Q3的基极与集电极接地，三极管Q3的发射极与电阻R2的一端相连；电阻R2的另一端与正温度系数电流IPTAT2相连，并输出到运算放大器的正向输入端；所述运算放大器的负向输入端与MOS管NM3的源极和电阻R3的一端相连，电阻R3的另一端接地；所述运算放大器的输出端与MOS管NM3的栅极相连；所述MOS管NM3的漏极与MOS管PM5的漏极和MOS管PM5的栅极相连，MOS管PM5的栅极、MOS管PM6的栅极和MOS管PM7的栅极相连接，MOS管PM5的源极、MOS管PM6的源极与MOS管PM7的源极共同连接到供电电压VDD，MOS管PM6的漏极 作为所述的零温度系数电流电路的输出端，MOS管PM7的漏极输出零温度系数电流给第三比例电流电路的输入端。The base of the transistor Q3 and the collector are grounded, and the emitter of the transistor Q3 is connected to one end of the resistor R2; the other end of the resistor R2 is connected to the positive temperature coefficient current IPTAT2 and output to the positive input end of the operational amplifier; the operational amplifier The negative input terminal is connected to the source of the MOS tube NM3 and one end of the resistor R3, and the other end of the resistor R3 is grounded; the output end of the operational amplifier is connected to the gate of the MOS tube NM3; the drain of the MOS tube NM3 Connected to the drain of MOS tube PM5 and the gate of MOS tube PM5, the gate of MOS tube PM5, the gate of MOS tube PM6 and the gate of MOS tube PM7 are connected, the source of MOS tube PM5, and the gate of MOS tube PM6 The source and the source of the MOS tube PM7 are connected to the supply voltage VDD in common. The drain of the MOS tube PM6 is used as the output terminal of the zero temperature coefficient current circuit. The drain of the MOS tube PM7 outputs a zero temperature coefficient current to the third ratio. Input of a current circuit.
优选的，所述第一比例电流电路，由MOS管NM4和MOS管NM5镜像组成；MOS管NM4的源极和MOS管NM5的源极接地，MOS管NM4的漏极和栅极相连并作为第一比例电流电路的输入端；MOS管NM5的栅极接MOS管NM4的栅极，MOS管NM5的漏极输出电流IP1；Preferably, the first proportional current circuit is composed of a mirror image of the MOS tube NM4 and the MOS tube NM5; the source of the MOS tube NM4 and the source of the MOS tube NM5 are grounded; The input terminal of a proportional current circuit; the gate of the MOS tube NM5 is connected to the gate of the MOS tube NM4, and the drain of the MOS tube NM5 outputs the current IP1;
所述第二比例电流电路，由MOS管NM6和MOS管NM7镜像组成；MOS管NM6的源极和MOS管NM7的源极接地，MOS管NM6的漏极和栅极相连并作为第二比例电流电路的输入端；MOS管NM7栅极接MOS管NM6栅极，MOS管NM7的漏极输出电流IP2；The second proportional current circuit is composed of the MOS tube NM6 and the MOS tube NM7. The source of the MOS tube NM6 and the source of the MOS tube NM7 are grounded. The drain and the gate of the MOS tube NM6 are connected and used as the second proportional current. The input end of the circuit; the gate of the MOS tube NM7 is connected to the gate of the MOS tube NM6, and the drain of the MOS tube NM7 outputs the current IP2;
所述第三比例电流电路，由MOS管NM8和MOS管NM9镜像组成；MOS管NM9的源极和MOS管NM8的源极接地，MOS管NM9的漏极和栅极连接并作为第三比例电流电路的输入端；MOS管NM8栅极接MOS管NM9栅极，MOS管NM8的漏极输出IP3电流。The third proportional current circuit is composed of the MOS tube NM8 and the MOS tube NM9. The source of the MOS tube NM9 and the source of the MOS tube NM8 are grounded. The drain and the gate of the MOS tube NM9 are connected and used as the third proportional current. The input end of the circuit; the gate of the MOS tube NM8 is connected to the gate of the MOS tube NM9, and the drain of the MOS tube NM8 outputs an IP3 current.
为达到上述目的，本发明还提供一种电流源电路的实现方法，实现任意正温度系数电流或者在全温度范围内具有两种温度系数的电流，包括如下步骤：In order to achieve the above object, the present invention also provides a method for implementing a current source circuit, which realizes any positive temperature coefficient current or a current with two temperature coefficients in a full temperature range, including the following steps:
步骤一，正温度系数电流产生电路产生两路正温度系数电流IPTAT1和IPTAT2； Step 1. The positive temperature coefficient current generating circuit generates two positive temperature coefficient currents IPTAT1 and IPTAT2.
步骤二，将正温度系数电流IPTAT2输出到零温度系数电流产生电路，零温度系数电流产生电路产生两路零温度系数电流IZTC1和IZTC2；Step 2: output the positive temperature coefficient current IPTAT2 to the zero temperature coefficient current generating circuit, and the zero temperature coefficient current generating circuit generates two zero temperature coefficient currents IZTC1 and IZTC2;
步骤三，利用第一比例电流电路将零温度系数电流IZTC1镜像为电流IP1；并与正温度系数电流IPTAT1相减，得到电流IP21输入到第二比例电流电路的输入端；Step three: use the first proportional current circuit to mirror the zero temperature coefficient current IZTC1 as the current IP1; and subtract it from the positive temperature coefficient current IPTAT1 to obtain the current IP21 input to the input terminal of the second proportional current circuit;
步骤四，利用第二比例电流电路将所述IP21电流镜像为电流IP2；Step four: use the second proportional current circuit to mirror the IP21 current as the current IP2;
步骤五，利用第三比例电流电路将零温度系数电流IZTC2镜像为电流IP3；所述IP2电流和IP3电流相加，产生并输出所述任意正温度系数电流或者在全温度范围内具有两种温度系数的电流。Step 5: Use a third proportional current circuit to mirror the zero temperature coefficient current IZTC2 as the current IP3; the IP2 current and the IP3 current are added to generate and output the arbitrary positive temperature coefficient current or have two temperatures in the entire temperature range Coefficient of current.
实现任意负温度系数电流或者在全温度范围内具有两种温度系数的电流，包括如下步骤：Achieving any negative temperature coefficient current or current with two temperature coefficients over the full temperature range includes the following steps:
步骤一，正温度系数电流产生电路产生两路正温度系数电流IPTAT1和IPTAT2； Step 1. The positive temperature coefficient current generating circuit generates two positive temperature coefficient currents IPTAT1 and IPTAT2.
步骤二，将正温度系数电流IPTAT2输出到零温度系数电流产生电路，零温度系数电流产生电路产生两路零温度系数电流IZTC1和IZTC2；Step 2: output the positive temperature coefficient current IPTAT2 to the zero temperature coefficient current generating circuit, and the zero temperature coefficient current generating circuit generates two zero temperature coefficient currents IZTC1 and IZTC2;
步骤三，利用第一比例电流电路将正温度系数电流ITPAT1镜像为电流IP1；并与零温度系数电流IZTC1相减，得到电流IP21输入到第二比例电流电路的输入端；Step three: use the first proportional current circuit to mirror the positive temperature coefficient current ITPAT1 as the current IP1; and subtract it from the zero temperature coefficient current IZTC1 to obtain the current IP21 input to the input terminal of the second proportional current circuit;
步骤四，利用第二比例电流电路将所述IP21电流镜像为电流IP2；Step four: use the second proportional current circuit to mirror the IP21 current as the current IP2;
步骤五，利用第三比例电流电路将零温度系数电流IZTC2镜像为电流IP3；所述IP2电流和IP3电流相加，产生并输出所述任意负温度系数电流或者在全温度范围内具有两种温度系数的电流。Step 5: Use a third proportional current circuit to mirror the zero temperature coefficient current IZTC2 as the current IP3; the IP2 current and the IP3 current are added to generate and output the arbitrary negative temperature coefficient current or have two temperatures in the entire temperature range Coefficient of current.
与现有的技术相比，本发明所述的一种电流源电路及其实现方法通过正温度系数电流与零温度系数电流再组合产生所需的任意温度系数电流，电路实现简单，适用于后级各种不同温度系数电流的产生。Compared with the prior art, a current source circuit and an implementation method thereof according to the present invention generate a desired arbitrary temperature coefficient current by recombining a positive temperature coefficient current and a zero temperature coefficient current. The circuit is simple to implement and is suitable for use in the future. Generation of various temperature coefficient currents.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1为本发明第一实施例原理框图；FIG. 1 is a schematic block diagram of a first embodiment of the present invention;
图2为本发明第一实施例电路结构图；FIG. 2 is a circuit structural diagram of a first embodiment of the present invention; FIG.
图3为本发明第一实施例具有两种温度系数的输出电流特性曲线图；3 is a graph of output current characteristics with two temperature coefficients according to the first embodiment of the present invention;
图4为本发明第一实施例正温度系数输出电流特性曲线图；4 is a characteristic curve diagram of a positive temperature coefficient output current according to a first embodiment of the present invention;
图5为本发明第二实施例电路结构图；5 is a circuit configuration diagram of a second embodiment of the present invention;
图6为本发明第二实施例具有两种温度系数的输出电流特性曲线图；6 is a graph of output current characteristics with two temperature coefficients according to a second embodiment of the present invention;
图7为本发明第二实施例负温度系数输出电流特性曲线图。FIG. 7 is a characteristic curve diagram of a negative temperature coefficient output current according to a second embodiment of the present invention.
具体实施方式detailed description
第一实施例First embodiment
图1是本发明实施例提供的一种电流源电路原理框图。如图1所示，包括第一电流产生电路10，第二电流产生电路11，第一比例电流电路12，第二比例电流电路13，第三比例电流电路14，电流相减节点13A，电流相加节点14A。FIG. 1 is a schematic block diagram of a current source circuit according to an embodiment of the present invention. As shown in FIG. 1, it includes a first current generating circuit 10, a second current generating circuit 11, a first proportional current circuit 12, a second proportional current circuit 13, a third proportional current circuit 14, a current subtraction node 13A, and a current phase Add node 14A.
第一电流产生电路10输出零温度系数第一电流IZTC1和第三电流IZTC2；第二电流产生电路输出与温度成正比例的第二电流IPTAT1；第一比例电流电路将第一电流IZTC1配置成需要的比例系数后，输出IP1电流；第二电流IPTAT1与 第一比例电流电路输出IP1汇集于节点13A，相减并输出IP21电流到第二比例电流电路。第二比例电流电路将IP21电流配置成需要的比例系数后，输出IP2电流。第三比例电流电路将第三电流IZTC2配置成需要的比例系数后，输出IP3电流。IP2电流与IP3电流汇集于节点14A，相加后输出所需正温度系数电流IOUT。The first current generating circuit 10 outputs a first current IZTC1 and a third current IZTC2 with zero temperature coefficient; the second current generating circuit outputs a second current IPTAT1 which is proportional to the temperature; the first proportional current circuit configures the first current IZTC1 as required After the scaling factor, the IP1 current is output; the second current IPTAT1 and the first proportional current circuit output IP1 are collected at node 13A, subtracted and output the IP21 current to the second proportional current circuit. The second proportional current circuit configures the IP21 current to a required proportionality factor, and then outputs the IP2 current. The third proportional current circuit configures the third current IZTC2 to a required proportionality factor, and outputs an IP3 current. The IP2 current and the IP3 current are collected at the node 14A, and after adding, the required positive temperature coefficient current IOUT is output.
图2是第一实施例的电路结构图。如图2所示，第二电流产生电路11，产生正温度系数电流IPTAT1和IPTAT2，包括MOS管PM1、PM2、PM3、PM4、NM1、NM2，电阻R1，三极管Q1和Q2。PM1的源极、PM2的源极、PM3的源极、PM4的源极连接到供电电压VCC，PM1的栅极、PM2的栅极、PM3的栅极、PM4的栅极相连接，PM2的漏极与PM2的栅极连接后接到NM2的漏极；PM1的漏极连接NM1的漏极，NM1的栅极分别与NM1的漏极、NM2的栅极相连接，NM1的源极连接到Q1的发射极，NM2的源极连接电阻R1的一端，电阻R1的另一端连接Q2的发射极；Q1的基极连接Q2的基极，Q1的集电极与Q2的集电极接地；PM3的漏极输出第二电流IPTAT1到电流相减节点13A，PM4的漏极输出电流IPTAT2给第一电流产生电路；其中PM1、PM2为PMOS管，NM1、NM2为NMOS管，其尺寸设置为PM1:PM2＝1:1；Q1和Q2尺寸设置为Q1:Q2＝1:N(N>1，N为整数)；设置PM3和PM4为PMOS管，单位比例镜像PM2电流PM2:PM3:PM4＝1:1:1(也可以根据需要设置不同比例电流)。输出电流IPTAT1和IPTAT2为FIG. 2 is a circuit configuration diagram of the first embodiment. As shown in FIG. 2, the second current generating circuit 11 generates positive temperature coefficient currents IPTAT1 and IPTAT2, including MOS transistors PM1, PM2, PM3, PM4, NM1, NM2, resistors R1, and transistors Q1 and Q2. The source of PM1, the source of PM2, the source of PM3, and the source of PM4 are connected to the supply voltage VCC. The gate of PM1, the gate of PM2, the gate of PM3, and the gate of PM4 are connected, and the drain of PM2 is connected. The electrode is connected to the drain of NM2 after being connected to the gate of PM2; the drain of PM1 is connected to the drain of NM1, the gate of NM1 is connected to the drain of NM1 and the gate of NM2, and the source of NM1 is connected to Q1 The emitter of NM2 is connected to one end of resistor R1, and the other end of resistor R1 is connected to the emitter of Q2; the base of Q1 is connected to the base of Q2, and the collector of Q1 is connected to the collector of Q2; the drain of PM3 Output the second current IPTAT1 to the current subtraction node 13A, and the drain of PM4 outputs the current IPTAT2 to the first current generation circuit; PM1, PM2 are PMOS tubes, NM1, NM2 are NMOS tubes, and the size is set to PM1: PM2 = 1 : 1; Q1 and Q2 dimensions are set to Q1: Q2 = 1: N (N> 1, N is an integer); PM3 and PM4 are set as PMOS tubes, and the PM2 current is mirrored by PM2: PM3: PM4 = 1: 1: 1 (You can also set different proportions of current as required). Output current IPTAT1 and IPTAT2 are
Figure PCTCN2019084981-appb-000001
Figure PCTCN2019084981-appb-000001
由上式可得，IPTAT1和IPTAT2为正温度系数电流。From the above formula, IPTAT1 and IPTAT2 are positive temperature coefficient currents.
如图2所示，第一电流产生电路10，产生零温度系数电流IZTC1和IZTC2。As shown in FIG. 2, the first current generating circuit 10 generates zero temperature coefficient currents IZTC1 and IZTC2.
第一电流产生电路10包括MOS管PM5、PM6、PM7、NM3、运算放大器OPA，电阻R2和R3、NPN三极管Q3，三极管Q3的基极和集电极接地，三极管Q3的发射极与R2的一端相连；R2的另一端连接电流IPTAT2，并连接到运算放大器正向输入端；所述运算放大器负向输入端与MOS管NM3的源极和R3的一端相连，R3的另一端接地；所述运算放大器输出端与NM3的管栅极相连；NM3的漏极与PM5的漏极和栅极相连，PM5的栅极、PM6的栅极、PM7的栅极相连接，PM5的源极、PM6的源极与PM7的源极共同连接到供电电压VDD，PM6的漏极输出第一电流IZTC1给第一比例电流电路的输入端，PM7的漏极输出第三电流IZTC2给第三比 例电流电路的输入端。PM5管镜像到第六PMOS管和第七PMOS管，输出第一和第二零温度系数电流；所述第五PMOS管、第六PMOS管和第七PMOS管组成电流镜像单元。The first current generating circuit 10 includes MOS transistors PM5, PM6, PM7, NM3, operational amplifier OPA, resistors R2 and R3, NPN transistor Q3, the base and collector of transistor Q3 are grounded, and the emitter of transistor Q3 is connected to one end of R2 ; The other end of R2 is connected to the current IPTAT2 and is connected to the positive input end of the operational amplifier; the negative input end of the operational amplifier is connected to the source of MOS tube NM3 and one end of R3, and the other end of R3 is grounded; the operational amplifier The output end is connected to the tube gate of NM3; the drain of NM3 is connected to the drain and gate of PM5, the gate of PM5, the gate of PM6 and the gate of PM7 are connected, the source of PM5 and the source of PM6 The source of PM7 is connected to the supply voltage VDD. The drain of PM6 outputs the first current IZTC1 to the input terminal of the first proportional current circuit, and the drain of PM7 outputs the third current IZTC2 to the input terminal of the third proportional current circuit. The PM5 tube is mirrored to the sixth PMOS tube and the seventh PMOS tube, and outputs the first and second zero temperature coefficient currents; the fifth PMOS tube, the sixth PMOS tube, and the seventh PMOS tube form a current mirroring unit.
第二电流产生电路产生与温度成正比例电流IPTAT2与电阻R2、三极管Q3组成电压基准电路；IPTAT2接R2电阻一端；R2电阻另一端接三极管Q3发射极，三极管Q3的基极和集电极接地；产生与温度成比例电压VREF1；The second current generating circuit generates a voltage reference circuit that is proportional to the temperature IPTAT2 and resistor R2 and transistor Q3; IPTAT2 is connected to one end of R2 resistor; the other end of R2 resistor is connected to the emitter of transistor Q3, and the base and collector of transistor Q3 are grounded; Voltage VREF1 proportional to temperature;
Figure PCTCN2019084981-appb-000002
Figure PCTCN2019084981-appb-000002
基准电压VREF1输出到运放OPA正向端，运放输出接NMOS管NM3栅极，NM3源级接电阻R3一端并输出到运放负相输入端，电阻R3另一端接地；N3漏极作为电流输出到电流镜像单元，电流镜像单元由PM5、PM6和PM7三个PMOS组成，器件尺寸按照1:1:1设置，输出电流IZTC1和IZTC2，其电流大小如下：The reference voltage VREF1 is output to the OPA positive terminal. The output of the op amp is connected to the gate of the NMOS tube NM3. The NM3 source is connected to one end of the resistor R3 and output to the negative phase input of the op amp. The other end of the resistor R3 is grounded. The drain of N3 is used as the current. Output to the current mirror unit. The current mirror unit consists of three PMOSs PM5, PM6 and PM7. The device size is set according to 1: 1: 1. The output currents IZTC1 and IZTC2 are as follows:
Figure PCTCN2019084981-appb-000003
Figure PCTCN2019084981-appb-000003
上式中R1、R2为同类型电阻，其温度特性相同；假设
Figure PCTCN2019084981-appb-000004
k'为与温度无关的系数。在不同的工艺中电阻R3温度特性也不相同，考虑到电阻的二阶温度系数影响很小，在此将其一阶近似为R3＝R×(1+tc1×(T-25))，其中R为电阻方阻值(常数)，tc1为电阻温度系数，T为温度(摄氏度)；tc1为正数时电阻为正温度系数特性，tc1为负数时电阻为负温度系数特性。 In the above formula, R1 and R2 are the same type of resistor, and their temperature characteristics are the same;
Figure PCTCN2019084981-appb-000004
k 'is a temperature independent coefficient. The temperature characteristics of the resistor R3 are also different in different processes. Considering that the second-order temperature coefficient of the resistor has a small effect, the first order is approximated as R3 = R × (1 + tc1 × (T-25)), where R is the resistance resistance (constant), tc1 is the temperature coefficient of resistance, and T is the temperature (degrees Celsius); when tc1 is a positive number, the resistance is a positive temperature coefficient characteristic, and when tc1 is a negative number, the resistance is a negative temperature coefficient characteristic.
设置零温度系数产生电路中k'×T+V BEQ3的温度系数和R3电阻温度系数相同，则可以得到零温度系数电流IZTC1和IZTC2。 Set the temperature coefficient of k ′ × T + V BEQ3 and the temperature coefficient of R3 resistance in the zero temperature coefficient generation circuit to obtain the zero temperature coefficient current IZTC1 and IZTC2.
如图2所示，第一比例电流电路12，由第四NMOS管NM4和第五NMOS管NM5组成。NM4的源极和NM5的源极接地，NM4的漏极和栅极相连并接第一电流产生电路电流IZTC1；NM5栅极接NM4栅极，NM5的漏极镜像输出IP1电流；NM4和NM5尺寸设置为NM4:NM5＝N1:M1，因此，输出电流IP1为As shown in FIG. 2, the first proportional current circuit 12 is composed of a fourth NMOS transistor NM4 and a fifth NMOS transistor NM5. The source of NM4 and the source of NM5 are grounded, the drain of NM4 is connected to the gate and connected to the first current generating circuit current IZTC1; the gate of NM5 is connected to the gate of NM4, the drain of NM5 mirrors the output IP1 current; NM4 and NM5 sizes Set to NM4: NM5 = N1: M1, so the output current IP1 is
Figure PCTCN2019084981-appb-000005
Figure PCTCN2019084981-appb-000005
如图2所示，第二比例电流电路13，由第六NMOS管NM6和第七NMOS管NM7 组成。NM6的源极和NM7的源极接地，NM6的漏极和栅极相连并接第二电流产生电路电流IPTAT1与第一比例电流电路输出IP1的电流相减节点13A；NM7栅极接NM6栅极，NM7的漏极镜像输出IP2电流；NM4和NM5尺寸设置为NM6:NM7＝N2:M2。因此，输出电流IP2为As shown in FIG. 2, the second proportional current circuit 13 is composed of a sixth NMOS transistor NM6 and a seventh NMOS transistor NM7. The source of NM6 and the source of NM7 are grounded. The drain of NM6 is connected to the gate and connected to the second current generating circuit current IPTAT1 and the current subtracting node 13A of the first proportional current circuit output IP1; The drain of NM7 mirrors the output IP2 current; the sizes of NM4 and NM5 are set to NM6: NM7 = N2: M2. Therefore, the output current IP2 is
Figure PCTCN2019084981-appb-000006
Figure PCTCN2019084981-appb-000006
如图2所示，第三比例电流电路14，由第八NMOS管NM8和第九NMOS管NM9组成。NM9的源极和NM8的源极接地，NM9的漏极和栅极连接并接第一电流产生电路电流IZTC2；NM8栅极接NM9栅极，NM8的漏极镜像输出IP3电流；NM8和NM9尺寸设置为NM8:NM9＝N3:M3，因此，输出电流IP3为As shown in FIG. 2, the third proportional current circuit 14 is composed of an eighth NMOS transistor NM8 and a ninth NMOS transistor NM9. The source of NM9 and the source of NM8 are grounded. The drain and gate of NM9 are connected and connected to the first current generating circuit current IZTC2; the gate of NM8 is connected to the gate of NM9, and the drain of NM8 mirrors the output IP3 current; NM8 and NM9 sizes Set to NM8: NM9 = N3: M3, so the output current IP3 is
Figure PCTCN2019084981-appb-000007
Figure PCTCN2019084981-appb-000007
如图2所示，第二比例电流电路输出IP2与第三比例电流电路IP3汇集于节点14A，相加后输出电流IOUTAs shown in FIG. 2, the output of the second proportional current circuit IP2 and the third proportional current circuit IP3 are collected at the node 14A, and the output current IOUT is added after the addition.
Figure PCTCN2019084981-appb-000008
Figure PCTCN2019084981-appb-000008
通过设置不同的N1、M1，可以得到不同温度特性的IP21电流：By setting different N1 and M1, IP21 currents with different temperature characteristics can be obtained:
通过设置不同的N2、M2，可以得到不同温度系数的IP2电流：By setting different N2 and M2, IP2 currents with different temperature coefficients can be obtained:
如图3所示，当温度为常温27℃时，设置
Figure PCTCN2019084981-appb-000009
设置不同比例的N2:M2、N3:M3，可以得到具有两种温度系数特性的输出电流IOUT。 As shown in Figure 3, when the temperature is 27 ℃, set
Figure PCTCN2019084981-appb-000009
Setting different ratios of N2: M2 and N3: M3 can get the output current IOUT with two temperature coefficient characteristics.
如图4所示，当温度为低温-40℃时，设置
Figure PCTCN2019084981-appb-000010
设置不同比例的N2:M2、N3:M3，可以得到具有不同正温度系数特性的输出电流IOUT。 As shown in Figure 4, when the temperature is low -40 ° C, set
Figure PCTCN2019084981-appb-000010
Setting different ratios of N2: M2 and N3: M3 can get output current IOUT with different positive temperature coefficient characteristics.
第二实施例Second embodiment
本发明另一种实施例。其结构框图与第一实施例相同，如图1。包括第一电流产生电路10，第二电流产生电路11，第一比例电流电路12，第二比例电流电路13，第三比例电流电路14，电流相减节点13A，电流相加节点14A。Another embodiment of the present invention. Its structural block diagram is the same as that of the first embodiment, as shown in FIG. 1. It includes a first current generating circuit 10, a second current generating circuit 11, a first proportional current circuit 12, a second proportional current circuit 13, a third proportional current circuit 14, a current subtraction node 13A, and a current addition node 14A.
与第一实施例不同之处在于，第一电流产生电路10产生正温度系数电流第一电流IPTAT1和电流IPTAT2；第二电流产生电路11产生零温度系数第二电流 IZTC1和电流IZTC2；第一比例电流电路输入电流为第一电流IPTAT1；第二比例电流电路的输入电流IP21由第二电流产生电路输出IZTC1与第一比例电流电路输出IP1相减得到；第三比例电流电路输入电流IZTC2由第二电流产生电路生成。The difference from the first embodiment is that the first current generating circuit 10 generates a positive temperature coefficient current, the first current IPTAT1 and the current IPTAT2; the second current generating circuit 11 generates a zero temperature coefficient second current IZTC1 and a current IZTC2; the first ratio The input current of the current circuit is the first current IPTAT1; the input current IP21 of the second proportional current circuit is obtained by subtracting the output IZTC1 of the second current generating circuit from the output IP1 of the first proportional current circuit; the input current IZTC2 of the third proportional current circuit is obtained by the second Generated by the current generation circuit.
输出电流IOUT仍然由IP2电流与IP3电流相加得到，输出电流IOUT为负温度系数电流。The output current IOUT is still obtained by adding the IP2 current and the IP3 current, and the output current IOUT is a negative temperature coefficient current.
图5是第二实施例的电路结构图。如图5所示，第一电流产生电路10为正温度系数电流产生电路，与实施例一第二电流产生电路结构相同，原理不再赘述。第二电流产生电路11为零温度系数电流产生电路与第一实施例第一电流产生电路相同，原理不再赘述。FIG. 5 is a circuit configuration diagram of the second embodiment. As shown in FIG. 5, the first current generating circuit 10 is a positive temperature coefficient current generating circuit, and the structure is the same as that of the second current generating circuit of the first embodiment, and the principle is not described again. The second current generating circuit 11 is a zero temperature coefficient current generating circuit, which is the same as the first current generating circuit of the first embodiment, and the principle is not described again.
如图5所示，第一比例电流电路12结构与第一实施例相同。其输入端接第一电流产生电路电流IPTAT1；NM4和NM5尺寸设置为NM4:NM5＝N1:M1，因此，输出电流IP1为As shown in FIG. 5, the structure of the first proportional current circuit 12 is the same as that of the first embodiment. Its input terminal is connected to the first current generating circuit current IPTAT1; the sizes of NM4 and NM5 are set to NM4: NM5 = N1: M1, so the output current IP1 is
Figure PCTCN2019084981-appb-000011
Figure PCTCN2019084981-appb-000011
如图5所示，第二比例电流电路13结构与第一实施例相同。其输入接第二电流产生电路电流IZTC1与第一比例电流电路输出IP1的连接端13A；NM6和NM7尺寸设置为NM6:NM7＝N2:M2。因此，输出电流IP2为As shown in FIG. 5, the structure of the second proportional current circuit 13 is the same as that of the first embodiment. Its input is connected to the connection terminal 13A of the second current generating circuit current IZTC1 and the first proportional current circuit output IP1; the sizes of NM6 and NM7 are set to NM6: NM7 = N2: M2. Therefore, the output current IP2 is
Figure PCTCN2019084981-appb-000012
Figure PCTCN2019084981-appb-000012
如图5所示，第三比例电流电路14结构与第一实施例完全相同。其输出电流IP3为As shown in FIG. 5, the structure of the third proportional current circuit 14 is completely the same as that of the first embodiment. Its output current IP3 is
Figure PCTCN2019084981-appb-000013
Figure PCTCN2019084981-appb-000013
如图5所示，第二比例电流电路输出IP2与第三比例电流电路IP3汇集于节点14A，相加后输出电流IOUTAs shown in FIG. 5, the output of the second proportional current circuit IP2 and the third proportional current circuit IP3 are collected at the node 14A, and the output current IOUT is added after the addition.
Figure PCTCN2019084981-appb-000014
Figure PCTCN2019084981-appb-000014
通过设置不同的N1、M1，可以得到不同温度特性的IP21电流：By setting different N1 and M1, IP21 currents with different temperature characteristics can be obtained:
通过设置不同的N2、M2，可以得到不同温度系数的IP2电流：By setting different N2 and M2, IP2 currents with different temperature coefficients can be obtained:
如图6所示，当温度为常温27℃时，设置
Figure PCTCN2019084981-appb-000015
设置不同 比例的N2:M2、N3:M3，可以得到具有两种温度系数特性的输出电流IOUT。 As shown in Figure 6, when the temperature is 27 ° C, set
Figure PCTCN2019084981-appb-000015
Setting different ratios of N2: M2 and N3: M3 can get the output current IOUT with two temperature coefficient characteristics.
如图7所示，当温度为高温125℃时，设置
Figure PCTCN2019084981-appb-000016
设置不同比例的N2:M2、N3:M3，可以得到具有不同负温度系数特性的输出电流IOUT。 As shown in Figure 7, when the temperature is 125 ° C, set
Figure PCTCN2019084981-appb-000016
Setting different ratios of N2: M2 and N3: M3 can get the output current IOUT with different negative temperature coefficient characteristics.
以上仅是本发明的优选实施方式，应当指出的是，上述优选实施方式不应视为对本发明的限制，对于本技术领域的普通技术人员来说，在不脱离本发明的精神和范围内，还可以做出若干改进和润饰，比如增加电流修调功能，对电流镜像比例进行调整，对不同温度系数的拐点进行调整，这些改进和润饰也应视为本发明的保护范围，这里不再用实施例赘述，本发明的保护范围应当以权利要求所限定的范围为准。The above are only the preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be considered as a limitation to the present invention. For those of ordinary skill in the art, without departing from the spirit and scope of the present invention, You can also make several improvements and retouches, such as adding a current trimming function, adjusting the current mirror ratio, and adjusting the inflection points of different temperature coefficients. These improvements and retouches should also be considered as the scope of protection of the present invention, and are not used here anymore. The embodiments repeat that the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims (7)

  1. 一种电流源电路，其特征在于：包括第一电流产生电路，第二电流产生电路，第一比例电流电路，第二比例电流电路和第三比例电流电路；A current source circuit, comprising: a first current generating circuit, a second current generating circuit, a first proportional current circuit, a second proportional current circuit, and a third proportional current circuit;
    所述第一电流产生电路的输入端连接供电电压VDD，所述第一电流产生电路的输出端与所述的第一比例电流电路的输入端相连；所述的第一比例电流电路输出电流IP1；An input terminal of the first current generating circuit is connected to a power supply voltage VDD, an output terminal of the first current generating circuit is connected to an input terminal of the first proportional current circuit, and the first proportional current circuit outputs a current IP1. ;
    所述第二电流产生电路的输入端连接供电电压VDD，所述第二电流产生电路的输出端的输出电流与所述的第一比例电流电路的输出电流IP1相减，并输出到第二比例电流电路的输入端，第二比例电流电路的输出端输出电流IP2；An input terminal of the second current generating circuit is connected to a power supply voltage VDD, and an output current of an output terminal of the second current generating circuit is subtracted from an output current IP1 of the first proportional current circuit, and is output to a second proportional current. The input end of the circuit and the output end of the second proportional current circuit output current IP2;
    所述第三比例电流电路的输入端接零温度系数电流，所述第三比例电流电路的输出端输出电流IP3；An input terminal of the third proportional current circuit is connected to a zero temperature coefficient current, and an output terminal of the third proportional current circuit outputs a current IP3;
    所述第二比例电流电路的输出电流IP2与第三比例电流电路的输出电流IP3相加，并输出最终电流。The output current IP2 of the second proportional current circuit is added to the output current IP3 of the third proportional current circuit, and a final current is output.
  2. 根据权利要求1所述的电流源电路，其特征在于：The current source circuit according to claim 1, wherein:
    当所述第一电流产生电路为正温度系数电流电路时，所述的第二电流产生电路为零温度系数电流电路；When the first current generating circuit is a positive temperature coefficient current circuit, the second current generating circuit is a zero temperature coefficient current circuit;
    当所述第一电流产生电路为零温度系数电流电路时，所述的第二电流产生电路为正温度系数电流电路。When the first current generating circuit is a zero temperature coefficient current circuit, the second current generating circuit is a positive temperature coefficient current circuit.
  3. 根据权利要求2所述的电流源电路，其特征在于：所述的正温度系数电流电路包括MOS管PM1、MOS管PM2、MOS管PM3、MOS管PM4、MOS管NM1、MOS管NM2、电阻R1、三极管Q1和三极管Q2；The current source circuit according to claim 2, wherein the positive temperature coefficient current circuit comprises a MOS tube PM1, a MOS tube PM2, a MOS tube PM3, a MOS tube PM4, a MOS tube NM1, a MOS tube NM2, and a resistor R1. , Transistor Q1 and transistor Q2;
    MOS管PM1的源极、MOS管PM2的源极、MOS管PM3的源极和MOS管PM4的源极连接到供电电压VCC，MOS管PM1的栅极、MOS管PM2的栅极、MOS管PM3的栅极和MOS管PM4的栅极相连接，MOS管PM2的漏极与MOS管PM2的栅极连接后接到MOS管NM2的漏极；MOS管PM1的漏极连接MOS管NM1的漏极，MOS管NM1的栅极分别与MOS管NM1的漏极、MOS管NM2的栅极相连接，MOS管NM1的源极连接到三极管Q1的发射极，MOS管NM2的源极连接电阻R1的一端，电阻R1的另一端连接三极管Q2的发射极；三极管Q1的基极连接三极管Q2的基极，三极管Q1的集电极与三极管Q2的集电极接地；MOS管PM3的漏极作为正温度系数电流 电路的输出端输出电流IPTAT1，MOS管PM4的漏极输出正温度系数电流IPTAT2给所述的零温度系数电流电路。The source of MOS tube PM1, the source of MOS tube PM2, the source of MOS tube PM3, and the source of MOS tube PM4 are connected to the supply voltage VCC, the gate of MOS tube PM1, the gate of MOS tube PM2, and MOS tube PM3. The gate of the MOS transistor PM4 is connected to the gate of the MOS transistor PM4. The drain of the MOS transistor PM2 is connected to the gate of the MOS transistor PM2 and then connected to the drain of the MOS transistor NM2. The gate of MOS tube NM1 is connected to the drain of MOS tube NM1 and the gate of MOS tube NM2, the source of MOS tube NM1 is connected to the emitter of transistor Q1, and the source of MOS tube NM2 is connected to one end of resistor R1. The other end of resistor R1 is connected to the emitter of transistor Q2; the base of transistor Q1 is connected to the base of transistor Q2, the collector of transistor Q1 is connected to the collector of transistor Q2; the drain of MOS transistor PM3 is used as a positive temperature coefficient current circuit The output terminal outputs a current IPTAT1, and the drain of the MOS tube PM4 outputs a positive temperature coefficient current IPTAT2 to the zero temperature coefficient current circuit.
  4. 根据权利要求3所述的电流源电路，其特征在于：所述零温度系数电流电路包括电阻R2、三极管Q3、运算放大器、MOS管NM3、电阻R3以及由MOS管PM5、MOS管PM6和MOS管PM7组成的电流镜像单元；The current source circuit according to claim 3, wherein the zero temperature coefficient current circuit comprises a resistor R2, a transistor Q3, an operational amplifier, a MOS tube NM3, a resistor R3, and a MOS tube PM5, a MOS tube PM6, and a MOS tube. Current mirror unit composed of PM7;
    三极管Q3的基极与集电极接地，三极管Q3的发射极与电阻R2的一端相连；电阻R2的另一端与正温度系数电流IPTAT2相连，并输出到运算放大器的正向输入端；所述运算放大器的负向输入端与MOS管NM3的源极和电阻R3的一端相连，电阻R3的另一端接地；所述运算放大器的输出端与MOS管NM3的栅极相连；所述MOS管NM3的漏极与MOS管PM5的漏极和MOS管PM5的栅极相连，MOS管PM5的栅极、MOS管PM6的栅极和MOS管PM7的栅极相连接，MOS管PM5的源极、MOS管PM6的源极与MOS管PM7的源极共同连接到供电电压VDD，MOS管PM6的漏极作为所述的零温度系数电流电路的输出端，MOS管PM7的漏极输出零温度系数电流给第三比例电流电路的输入端。The base of the transistor Q3 and the collector are grounded, and the emitter of the transistor Q3 is connected to one end of the resistor R2; the other end of the resistor R2 is connected to the positive temperature coefficient current IPTAT2 and output to the positive input end of the operational amplifier; the operational amplifier The negative input terminal is connected to the source of the MOS tube NM3 and one end of the resistor R3, and the other end of the resistor R3 is grounded; the output end of the operational amplifier is connected to the gate of the MOS tube NM3; the drain of the MOS tube NM3 Connected to the drain of MOS tube PM5 and the gate of MOS tube PM5, the gate of MOS tube PM5, the gate of MOS tube PM6 and the gate of MOS tube PM7 are connected, the source of MOS tube PM5, and the gate of MOS tube PM6 The source and the source of the MOS tube PM7 are connected to the supply voltage VDD in common. The drain of the MOS tube PM6 is used as the output terminal of the zero temperature coefficient current circuit. The drain of the MOS tube PM7 outputs a zero temperature coefficient current to the third ratio. Input of a current circuit.
  5. 根据权利要求2所述的电流源电路，其特征在于：The current source circuit according to claim 2, wherein:
    所述第一比例电流电路，由MOS管NM4和MOS管NM5镜像组成；MOS管NM4的源极和MOS管NM5的源极接地，MOS管NM4的漏极和栅极相连并作为第一比例电流电路的输入端；MOS管NM5的栅极接MOS管NM4的栅极，MOS管NM5的漏极输出电流IP1；The first proportional current circuit is composed of the MOS tube NM4 and the MOS tube NM5. The source of the MOS tube NM4 and the source of the MOS tube NM5 are grounded. The drain and the gate of the MOS tube NM4 are connected as the first proportional current. The input end of the circuit; the gate of the MOS tube NM5 is connected to the gate of the MOS tube NM4, and the drain of the MOS tube NM5 outputs the current IP1;
    所述第二比例电流电路，由MOS管NM6和MOS管NM7镜像组成；MOS管NM6的源极和MOS管NM7的源极接地，MOS管NM6的漏极和栅极相连并作为第二比例电流电路的输入端；MOS管NM7栅极接MOS管NM6栅极，MOS管NM7的漏极输出电流IP2；The second proportional current circuit is composed of the MOS tube NM6 and the MOS tube NM7. The source of the MOS tube NM6 and the source of the MOS tube NM7 are grounded. The drain and the gate of the MOS tube NM6 are connected and used as the second proportional current. The input end of the circuit; the gate of the MOS tube NM7 is connected to the gate of the MOS tube NM6, and the drain of the MOS tube NM7 outputs the current IP2;
    所述第三比例电流电路，由MOS管NM8和MOS管NM9镜像组成；MOS管NM9的源极和MOS管NM8的源极接地，MOS管NM9的漏极和栅极连接并作为第三比例电流电路的输入端；MOS管NM8栅极接MOS管NM9栅极，MOS管NM8的漏极输出IP3电流。The third proportional current circuit is composed of the MOS tube NM8 and the MOS tube NM9. The source of the MOS tube NM9 and the source of the MOS tube NM8 are grounded. The drain and the gate of the MOS tube NM9 are connected and used as the third proportional current. The input end of the circuit; the gate of the MOS tube NM8 is connected to the gate of the MOS tube NM9, and the drain of the MOS tube NM8 outputs an IP3 current.
  6. 一种电流源电路的实现方法，其特征在于：包括以下步骤：A method for implementing a current source circuit is characterized in that it includes the following steps:
    步骤一，正温度系数电流产生电路产生两路正温度系数电流IPTAT1和IPTAT2；Step 1. The positive temperature coefficient current generating circuit generates two positive temperature coefficient currents IPTAT1 and IPTAT2.
    步骤二，将正温度系数电流IPTAT2输出到零温度系数电流产生电路，零温度系数电流产生电路产生两路零温度系数电流IZTC1和IZTC2；Step 2: output the positive temperature coefficient current IPTAT2 to the zero temperature coefficient current generating circuit, and the zero temperature coefficient current generating circuit generates two zero temperature coefficient currents IZTC1 and IZTC2;
    步骤三，利用第一比例电流电路将零温度系数电流IZTC1镜像为电流IP1；并与正温度系数电流IPTAT1相减，得到电流IP21输入到第二比例电流电路的输入端；Step three: use the first proportional current circuit to mirror the zero temperature coefficient current IZTC1 as the current IP1; and subtract it from the positive temperature coefficient current IPTAT1 to obtain the current IP21 input to the input terminal of the second proportional current circuit;
    步骤四，利用第二比例电流电路将所述IP21电流镜像为电流IP2；Step four: use the second proportional current circuit to mirror the IP21 current as the current IP2;
    步骤五，利用第三比例电流电路将零温度系数电流IZTC2镜像为电流IP3；所述IP2电流和IP3电流相加，产生并输出所述任意正温度系数电流或者在全温度范围内具有两种温度系数的电流。Step 5: Use a third proportional current circuit to mirror the zero temperature coefficient current IZTC2 as the current IP3; the IP2 current and the IP3 current are added to generate and output the arbitrary positive temperature coefficient current or have two temperatures in the entire temperature range Coefficient of current.
  7. 一种电流源电路的实现方法，其特征在于：包括以下步骤：A method for implementing a current source circuit is characterized in that it includes the following steps:
    步骤一，正温度系数电流产生电路产生两路正温度系数电流IPTAT1和IPTAT2；Step 1. The positive temperature coefficient current generating circuit generates two positive temperature coefficient currents IPTAT1 and IPTAT2.
    步骤二，将正温度系数电流IPTAT2输出到零温度系数电流产生电路，零温度系数电流产生电路产生两路零温度系数电流IZTC1和IZTC2；Step 2: output the positive temperature coefficient current IPTAT2 to the zero temperature coefficient current generating circuit, and the zero temperature coefficient current generating circuit generates two zero temperature coefficient currents IZTC1 and IZTC2;
    步骤三，利用第一比例电流电路将正温度系数电流ITPAT1镜像为电流IP1；并与零温度系数电流IZTC1相减，得到电流IP21输入到第二比例电流电路的输入端；Step three: use the first proportional current circuit to mirror the positive temperature coefficient current ITPAT1 as the current IP1; and subtract it from the zero temperature coefficient current IZTC1 to obtain the current IP21 input to the input terminal of the second proportional current circuit;
    步骤四，利用第二比例电流电路将所述IP21电流镜像为电流IP2；Step four: use the second proportional current circuit to mirror the IP21 current as the current IP2;
    步骤五，利用第三比例电流电路将零温度系数电流IZTC2镜像为电流IP3；所述IP2电流和IP3电流相加，产生并输出所述任意负温度系数电流或者在全温度范围内具有两种温度系数的电流。Step 5: Use a third proportional current circuit to mirror the zero temperature coefficient current IZTC2 as the current IP3; the IP2 current and the IP3 current are added to generate and output the arbitrary negative temperature coefficient current or have two temperatures in the entire temperature range Coefficient of current.
PCT/CN2019/084981 2018-07-24 2019-04-29 Current source circuit and implementation method therefor WO2020019805A1 (en)

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