CN111628725A - LC voltage-controlled oscillator circuit with noise circulation - Google Patents

LC voltage-controlled oscillator circuit with noise circulation Download PDF

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Publication number
CN111628725A
CN111628725A CN202010564508.XA CN202010564508A CN111628725A CN 111628725 A CN111628725 A CN 111628725A CN 202010564508 A CN202010564508 A CN 202010564508A CN 111628725 A CN111628725 A CN 111628725A
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circuit
noise
capacitor
resistor
voltage
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CN111628725B (en
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吉新村
沈梦琪
张宪伟
郭宇锋
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Nanjing University of Posts and Telecommunications
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Nanjing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1228—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more field effect transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

The invention discloses a noise-circulating LC voltage-controlled oscillator circuit, which comprises a resonator circuit and a noise-circulating active core circuit; the resonator circuit consists of an inductor, a capacitor and a resistor, and ensures the oscillator to start oscillation; the active core circuit with the noise circulation is used for offsetting resistance loss generated by passive devices in the resonator circuit, so that the oscillator can stably work. The advantages are that: the circuit simultaneously saves a tail current source, thereby avoiding the influence of flicker noise of the current source on phase noise and simultaneously reducing the power consumption of the voltage-controlled oscillator. Compared with the traditional cross-coupled voltage-controlled oscillator, in the circuit, the active core using the noise cycle greatly restrains the effective noise power of the active device, provides the same negative resistance, has high frequency and improves the phase noise.

Description

LC voltage-controlled oscillator circuit with noise circulation
Technical Field
The invention relates to a noise-circulating LC voltage-controlled oscillator circuit, belonging to the technical field of microelectronics.
Background
In SOC systems on chip, a phase-locked loop circuit is designed to provide a clock frequency for the system. The traditional phase-locked loop applied to the SOC has large power consumption and area and poor phase noise, the voltage-controlled oscillator is the core part of the phase-locked loop, and the oscillator circuit with low power consumption, small area and good phase noise has important value.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a noise-circulating LC voltage-controlled oscillator circuit.
In order to solve the above technical problem, the present invention provides a noise-cycled LC voltage-controlled oscillator circuit, which includes a resonator circuit and a noise-cycled active core circuit;
the resonance circuit is used for ensuring the oscillator to start oscillation through a circuit formed by an inductor, a capacitor and a resistor;
the active core circuit of the noise cycle is used for counteracting the resistance loss generated by the passive device in the resonator circuit.
Further, the resonant circuit comprises capacitors C2 and C3, variable capacitors C4 and C5, an inductor L, and resistors R3 and R4;
the capacitor C2, the variable capacitor C4, the variable capacitor C5 and the capacitor C3 are sequentially connected in series to form a series circuit, one end of the series circuit is respectively connected with a VCON end of the inductor L and an active core circuit with noise circulation, and the other end of the series circuit is respectively connected with a VCON end of the inductor L and the active core circuit with noise circulation;
one end of the resistor R3 is connected with a part connected with a capacitor C2 and a variable capacitor C4; one end of the resistor R4 is connected with a part connected with a capacitor C3 and a variable capacitor C5; the other end of the resistor R3 is connected to the other end of the resistor R4.
Furthermore, the variable capacitors C4 and C5 are connected with the control voltage Vc in between.
Furthermore, the input end of the inductor L is connected with a power supply VDD。
Further, the other end of the resistor R3 and the other end of the resistor R4 are connected to ground.
Further, the active core circuit of the noise cycle comprises NMOS cross-coupled pairs M0 and M1, capacitors C0 and C1, resistors R0 and R1, and PMOS transistors M2 and M3;
the grid electrode of the NMOS tube M0 is respectively connected with one end of a capacitor C1, the drain electrode of the NMOS tube M1 and the other end of the series circuit, the other end of the capacitor C1 is respectively connected with the grid electrode of the PMOS tube M3 and one end of a resistor R1, and the other end of the resistor R1 is grounded; the source electrode of the NMOS transistor M0 is connected with the source electrode of the PMOS transistor M2, and the drain electrode of the PMOS transistor M2 is grounded;
the grid electrode of the NMOS tube M1 is connected with one end of a capacitor C0, the drain electrode of the NMOS tube M0 and one end of the series circuit, the other end of the capacitor C0 is respectively connected with the grid electrode of the PMOS tube M2 and one end of a resistor R0, and the other end of the resistor R0 is grounded; the source electrode of the NMOS transistor M1 is connected with the source electrode of the PMOS transistor M3, and the drain electrode of the PMOS transistor M3 is grounded.
The invention achieves the following beneficial effects:
the circuit simultaneously saves a tail current source, thereby avoiding the influence of flicker noise of the current source on phase noise and simultaneously reducing the power consumption of the voltage-controlled oscillator. Compared with the traditional cross-coupled voltage-controlled oscillator, in the circuit, the active core using the noise cycle greatly restrains the effective noise power of the active device, provides the same negative resistance, has high frequency and improves the phase noise.
Drawings
FIG. 1 is a block circuit diagram of the present invention;
fig. 2 is a model of a center-tapped inductor circuit employed by the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A noise-cycled LC voltage-controlled oscillator circuit includes a resonator circuit and a noise-cycled active core circuit;
the resonator circuit comprises an inductor L, capacitors C2 and C3, variable capacitors C4 and C5 and resistors R3 and R4, and oscillation starting of the oscillator is guaranteed.
The active core circuit of noise circulation realizes 'negative resistance' by NMOS tube cross coupling pairs M0 and M1, compensates energy loss in a resonant circuit, ensures that an oscillator can continuously work, and the drain terminals of the NMOS tubes M0 and M1 are differential output; the resistors R1 and R0 are respectively connected with the grids of the PMOS tubes M3 and M2 to provide direct current bias for the PMOS tubes; one end of each of the capacitors C0 and C1 is connected with the grid of the NMOS transistor M1 and M0, and the other end is connected with the grid of the PMOS transistor M2 and M3, so that the direct current isolation and alternating current connection functions are realized.
As shown in fig. 1, the capacitors C2, C3, C4 and C5 in the resonator circuit form a series circuit, and are connected in parallel with the inductor L; the input port of the inductor L is connected with power supply voltage, the output ports are VCAP and VCON respectively, the VCAP and VCON are not only connected with one ends of the capacitors C2 and C3 respectively, but also connected with the drains of the cross-coupled pair NMOS tubes M0 and M1 respectively, and the drain outputs of the NMOS tubes M0 and M1 are differential outputs.
The active core circuit of noise circulation is composed of NMOS pair cross coupling M0, M1, capacitors C0, C1, resistors R0, R1 and PMOS tubes M2, M3. Since the resonator is configured by the inductor L, the capacitors C2 and C3, the variable capacitors C4 and C5, and the resistors R3 and R4, there is a resistance loss. The NMOS cross coupling pair M0 and M1 is used for realizing negative resistance, so that the heat energy consumed when part of energy in a passive device passes through the resistance can be counteracted, and the circuit oscillation is maintained; the drain electrode of the NMOS transistor M0 is connected with the gate electrode of the NMOS transistor M1, the gate electrode of the NMOS transistor M1 is connected with the capacitor C0, the other port of the capacitor C0 is connected with the gate electrode of the PMOS transistor M2, the resistor R0 is connected with the gate electrode of the PMOS transistor M2 to generate direct current bias and control the oscillation amplitude of the voltage-controlled oscillator, the drain electrode of the PMOS transistor M2 is connected with the ground, and the other port of the resistor R0 is also connected with the ground; the flicker noise of the PMOS tube is less than that of the NMOS tube, the grid electrode of the PMOS tube M2 is connected with the resistor R0, the 1/f noise can be reduced, the frequency mixing is carried out to the oscillation frequency, and the 1/f noise of the voltage-controlled oscillator is reduced3Phase noise of the region improves phase noise at high frequencies.
The working principle is as follows: as shown in fig. 1 and 2, the NMOS transistor M0 and the PMOS transistor M2 on the same side are turned on and off simultaneously. When the NMOS transistor M0 and the PMOS transistor M2 are simultaneously turned on, only a part of noise current is transmitted to the resonant circuit in the NMOS transistor M0, resulting in phase noise; another part of the noise current continuously circulates back to the PMOS transistor M2 in the NMOS transistor M0, and finally flows to the ground, and no phase noise is generated. Therefore, the phase noise can be greatly reduced by adopting the LC VCO structure with noise circulation. The operation of the NMOS transistor M1 and the PMOS transistor M3 on the other side are the same as above. The circuit simultaneously saves a tail current source, thereby avoiding the influence of flicker noise of the current source on phase noise and simultaneously reducing the power consumption of the voltage-controlled oscillator. Compared with the traditional cross-coupled voltage-controlled oscillator, in the circuit, the active core using the noise cycle greatly restrains the effective noise power of the active device, provides the same negative resistance, has high frequency and improves the phase noise.
The invention adopts NMOS cross coupling pair as active core, the sources of NMOS tubes M0 and M1 are separated, the drains of NMOS tubes M0 and M1 are respectively connected with VCON and VCON ends of the resonance circuit, and the oscillation of the circuit is maintained; the drains of the NMOS transistors M0, M1 also serve as differential outputs. By varying the control voltage VCThe variable capacitors C4 and C5 are changed in value, so that the oscillation frequency of the oscillator is controlled. The resistors R0 and R1 respectively provide bias voltage for the PMOS tubes M2 and M3 to change the output frequency. The active core circuit solves the problem that phase noise is poor due to active devices in the voltage-controlled oscillator.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (6)

1. A noise-circulating LC voltage-controlled oscillator circuit is characterized by comprising a resonator circuit and a noise-circulating active core circuit;
the resonance circuit is used for ensuring the oscillator to start oscillation through a circuit formed by an inductor, a capacitor and a resistor;
the active core circuit of the noise cycle is used for counteracting the resistance loss generated by the passive device in the resonator circuit.
2. The noise-circulating LC voltage-controlled oscillator circuit according to claim 1, wherein the resonant circuit comprises capacitors C2, C3, variable capacitors C4, C5, an inductor L, resistors R3, R4;
the capacitor C2, the variable capacitor C4, the variable capacitor C5 and the capacitor C3 are sequentially connected in series to form a series circuit, one end of the series circuit is respectively connected with a VCON end of the inductor L and an active core circuit with noise circulation, and the other end of the series circuit is respectively connected with a VCON end of the inductor L and the active core circuit with noise circulation;
one end of the resistor R3 is connected with a part connected with a capacitor C2 and a variable capacitor C4; one end of the resistor R4 is connected with a part connected with a capacitor C3 and a variable capacitor C5; the other end of the resistor R3 is connected to the other end of the resistor R4.
3. The noise-cycled LC vco circuit of claim 2, wherein the intermediate control voltage Vc of the variable capacitors C4, C5 is applied.
4. The noise-cycled LC voltage-controlled oscillator circuit according to claim 2, wherein the input terminal of the inductor L is connected to a power supply VDD。
5. The noise-cycled LC voltage-controlled oscillator circuit according to claim 2, wherein the other terminal of the resistor R3 and the other terminal of the resistor R4 are connected to ground.
6. The noise-cycled LC voltage controlled oscillator circuit of claim 2, wherein the noise-cycled active core circuit comprises an NMOS cross-coupled pair M0 and M1, capacitors C0, C1, resistors R0, R1, and PMOS transistors M2, M3;
the grid electrode of the NMOS tube M0 is respectively connected with one end of a capacitor C1, the drain electrode of the NMOS tube M1 and the other end of the series circuit, the other end of the capacitor C1 is respectively connected with the grid electrode of the PMOS tube M3 and one end of a resistor R1, and the other end of the resistor R1 is grounded; the source electrode of the NMOS transistor M0 is connected with the source electrode of the PMOS transistor M2, and the drain electrode of the PMOS transistor M2 is grounded;
the grid electrode of the NMOS tube M1 is connected with one end of a capacitor C0, the drain electrode of the NMOS tube M0 and one end of the series circuit, the other end of the capacitor C0 is respectively connected with the grid electrode of the PMOS tube M2 and one end of a resistor R0, and the other end of the resistor R0 is grounded; the source electrode of the NMOS transistor M1 is connected with the source electrode of the PMOS transistor M3, and the drain electrode of the PMOS transistor M3 is grounded.
CN202010564508.XA 2020-06-19 2020-06-19 LC voltage-controlled oscillator circuit with noise circulation Active CN111628725B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112737510A (en) * 2021-03-30 2021-04-30 深圳大学 Voltage-controlled oscillator, voltage-controlled oscillation processing method and electronic equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103107811A (en) * 2012-12-07 2013-05-15 南京邮电大学 Low phase noise inductance capacitance voltage-controlled oscillator
CN103684258A (en) * 2012-09-21 2014-03-26 中国科学院微电子研究所 Integrated low-noise voltage-controlled oscillator
CN103684441A (en) * 2012-09-21 2014-03-26 中国科学院微电子研究所 Low-noise voltage-controlled oscillator
CN103731140A (en) * 2012-10-12 2014-04-16 中国科学院微电子研究所 High-frequency voltage-controlled oscillator with low phase noise
CN107248847A (en) * 2017-05-23 2017-10-13 电子科技大学 A kind of difference Kao Bizi voltage controlled oscillators

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103684258A (en) * 2012-09-21 2014-03-26 中国科学院微电子研究所 Integrated low-noise voltage-controlled oscillator
CN103684441A (en) * 2012-09-21 2014-03-26 中国科学院微电子研究所 Low-noise voltage-controlled oscillator
CN103731140A (en) * 2012-10-12 2014-04-16 中国科学院微电子研究所 High-frequency voltage-controlled oscillator with low phase noise
CN103107811A (en) * 2012-12-07 2013-05-15 南京邮电大学 Low phase noise inductance capacitance voltage-controlled oscillator
CN107248847A (en) * 2017-05-23 2017-10-13 电子科技大学 A kind of difference Kao Bizi voltage controlled oscillators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112737510A (en) * 2021-03-30 2021-04-30 深圳大学 Voltage-controlled oscillator, voltage-controlled oscillation processing method and electronic equipment

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