CN111585515A - Envelope tracking power supply - Google Patents
Envelope tracking power supply Download PDFInfo
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- CN111585515A CN111585515A CN202010524056.2A CN202010524056A CN111585515A CN 111585515 A CN111585515 A CN 111585515A CN 202010524056 A CN202010524056 A CN 202010524056A CN 111585515 A CN111585515 A CN 111585515A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses an envelope tracking power supply which comprises a linear regulator and a switching regulator, wherein the linear regulator comprises a multi-threshold comparator, a first digital control circuit and a power tube unit, and the switching regulator comprises a second digital control circuit, a driving circuit, a power switch tube unit and an inductor; the first input end of the first digital control circuit is connected with the first output end of the multi-threshold comparator, the first output end of the first digital control circuit is connected with the first input end of the power tube unit, and the second output end of the first digital control circuit is connected with the first input end of the second digital control circuit; the first input end of the driving circuit is connected with the first output end of the second digital control circuit, the first output end of the driving circuit is connected with the first input end of the power switch tube unit, and the first output end of the power switch tube unit is connected with the input end of the inductor, so that the technical problem that an extra power loss is increased as a current sampling circuit and a hysteresis comparator are arranged in a switching regulator of an existing envelope tracking power supply is solved.
Description
Technical Field
The application relates to the technical field of mobile communication, in particular to an envelope tracking power supply.
Background
The envelope tracking technology tracks the envelope of a radio frequency signal by adjusting the Power supply voltage of a linear Power amplifier, so that the Power amplifier is positioned near a peak value of Added Power Efficiency (PAE) as long as possible, and the Efficiency of the linear Power amplifier in a Power back-off area is remarkably improved. In envelope tracking technology, the modulator used to regulate the power amplifier supply voltage is commonly referred to as an envelope tracking power supply. The envelope tracking power supply is the core of the envelope tracking technology, and the performance of the envelope tracking power supply directly influences the performance of the whole envelope tracking power amplifier system. First, the envelope tracking power supply itself should have a high efficiency. Second, the envelope tracking power supply should have a higher bandwidth than the envelope of the rf input signal so that its output voltage can track the envelope well. Third, the size of the envelope tracking power supply should be reduced as much as possible, making integration of the rf or mm-wave front end system easier.
The existing envelope tracking power supply is formed by connecting a switching regulator and an analog linear regulator in parallel, and because a current sampling circuit and a hysteresis comparator are arranged in the switching regulator, extra power loss is increased.
Disclosure of Invention
The application provides an envelope tracking power supply which is used for solving the technical problem that an existing envelope tracking power supply is provided with a current sampling circuit and a hysteresis comparator in a switching regulator, and extra power loss is increased.
In view of the above, the present application provides an envelope tracking power supply comprising a linear regulator and a switching regulator, the linear regulator comprising a multi-threshold comparator, a first digital control circuit and a power tube unit, the switching regulator comprising a second digital control circuit, a driving circuit, a power tube unit and an inductor;
the first input end of the first digital control circuit is connected with the first output end of the multi-threshold comparator, the first output end of the first digital control circuit is connected with the first input end of the power tube unit, and the second output end of the first digital control circuit is connected with the first input end of the second digital control circuit;
the first input end of the driving circuit is connected with the first output end of the second digital control circuit, and the first output end of the driving circuit is connected with the first input end of the power switch tube unit;
and the first output end of the power switch tube unit is connected with the input end of the inductor.
Optionally, the power tube unit includes several rows of power tubes;
each column of the power tubes comprises: MOS tube MPB1MOS tube MPCMOS tube MNCAnd MOS transistor MNB1；
The MOS tube MPB1The source electrode of the MOS transistor is connected with the power supply, and the drain electrode of the MOS transistor is connected with the MOS transistor MPCA source electrode of (a);
MOS manages MNCDrain electrode of the MOS transistor MP is connected with the MOS transistor MPCThe source electrode of the MOS transistor MN is connected with the drain electrode of the MOS transistor MNB1A drain electrode of (1);
MOS manages MNB1The source of (2) is grounded;
each row of MOS tubes MPCAnd each column of the MOS transistor MNCThe gates of all the first and second digital control circuits are connected with the first output end of the first digital control circuit.
Optionally, the device further comprises a MOS tube MPB0；
The MOS tube MPB0And each of the MOS transistors MPB1Forming a first current mirror;
the MOS tube MPB0The source electrode of the transistor is connected with a power supply;
the MOS tube MPB1And the MOS transistor MPB0The grid of the MOS transistor MP is connected with the MOS transistor MPB0Is connected to the drain of (1).
Optionally, the MOS transistor MN is further includedB0；
MOS manages MNB0And each MOS transistor MNB1Forming a second current mirror;
MOS manages MNB0The source of (2) is grounded;
MOS manages MNB1And the MOS transistor MNB0The grid of the MOS transistor is connected with the MOS transistor MNB0Is connected to the drain of (1).
Optionally, a voltage-current conversion circuit is further included;
the voltage-current conversion circuit, the plurality of first current mirrors and the plurality of second current mirrors form a bias current generation circuit;
the first output end of the voltage-current conversion circuit is connected with the MOS transistor MPB0A second output end connected with the MOS transistor MNB0Of the substrate.
Optionally, the second digital control circuit comprises a first inverter and an RS flip-flop.
Optionally, the power switch tube unit includes a MOS tube MPAnd MOS transistor MN；
The MOS tube MPAnd the MOS transistor MNThe grid electrodes of the grid electrodes are all connected with the first output end of the driving circuit;
the MOS tube MPThe source electrode of the transistor is connected with a power supply;
the MOS tube MNIs grounded, and the MOS transistor MNAnd the MOS transistor MPThe drains of which are connected to the input of the inductor.
According to the technical scheme, the method has the following advantages:
the application discloses an envelope tracking power supply which comprises a linear regulator and a switching regulator, wherein the linear regulator comprises a multi-threshold comparator, a first digital control circuit and a power tube unit, and the switching regulator comprises a second digital control circuit, a driving circuit, a power switch tube unit and an inductor; the first input end of the first digital control circuit is connected with the first output end of the multi-threshold comparator, the first output end of the first digital control circuit is connected with the first input end of the power tube unit, and the second output end of the first digital control circuit is connected with the first input end of the second digital control circuit; the first input end of the driving circuit is connected with the first output end of the second digital control circuit, and the first output end of the driving circuit is connected with the first input end of the power switch tube unit; the first output end of the power switch tube unit is connected with the input end of the inductor.
The method compares the difference value of the input envelope voltage and the output voltage with a plurality of threshold values through a multi-threshold comparator, obtains a plurality of digital control signals for controlling a power tube unit through a first digital control circuit to control the on-off number of MOS tubes in the power tube unit, thereby controlling the output voltage of an envelope tracking power supply to enable the output voltage of the envelope tracking power supply to be approximately equal to the input envelope voltage, controls the on-off of a switch tube in the power switch tube unit according to the digital control signal output by the first digital control circuit by utilizing a second digital control circuit to control the output current of a switch regulator, does not need to arrange a current sampling circuit and a hysteresis comparator in the switch regulator, simplifies the circuit design and reduces the power loss at the same time, thereby solving the problem that the existing envelope tracking power supply is provided with the current sampling circuit and the hysteresis comparator in the switch regulator, adding to the technical problem of additional power consumption.
Drawings
Fig. 1 is a schematic diagram of a connection between a conventional envelope tracking power supply and a linear power amplifier provided in an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a conventional linear regulator according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a conventional switching regulator according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a connection between an envelope tracking power supply and a linear power amplifier according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a linear regulator according to an embodiment of the present disclosure;
fig. 6 is a schematic circuit diagram of a switching regulator according to an embodiment of the present disclosure;
fig. 7 is a schematic flowchart of a process for controlling an output voltage of a linear regulator according to an embodiment of the present application.
Detailed Description
As shown in fig. 1, is an envelope tracking power supply circuit which is widely used at present. A high-efficiency switching regulator and a high-bandwidth analog linear regulator are connected in parallel to supply power to the linear power amplifier, and the analog linear regulator working in a voltage negative feedback mode is used for ensuring the tracking precision of an output envelope signal. Output current pair of analog linear regulatorThe switching regulator performs hysteresis control to control the ripple current of the inductor, and the current feedback loop reduces the current provided by the analog linear regulator, so that the existing analog linear regulator is only responsible for providing envelope power of a high frequency part and compensating noise generated by the switching regulator, and the existing switching regulator is responsible for providing envelope power of a low frequency part. As shown in fig. 2, a schematic diagram of a circuit structure of a conventional analog linear regulator, which includes an operational transconductance amplifier, a floating gate bias circuit and a CLASS AB output stage, is shown. As shown in FIG. 3, the circuit structure of the conventional switching regulator is schematically illustrated by sampling the output current I of the analog linear regulatorLAHysteresis control is performed on the switching regulator. As the modulation signal bandwidth and peak-to-average power ratio (PAPR) increase, the circuit has deficiencies in signal tracking accuracy and overall power consumption optimization. First, in order to track the envelope signal of the high frequency portion, the analog linear regulator needs to have a high bandwidth, which increases the power consumption of the analog linear regulator itself and reduces the overall efficiency of the envelope tracking power supply. Meanwhile, to ensure stable operation of the analog linear regulator having a high bandwidth, the difficulty of circuit design increases, and additional frequency compensation devices (Rc1, Rc2, Cc1, Cc2) are required. Secondly, the analog linear regulator needs to have a large output voltage slew rate, and a large driving current needs to be provided at the gates of the output-stage high-power transistors M15 and M16, so that the power consumption of the analog linear regulator is increased, and the efficiency of the envelope tracking power supply is reduced. In addition, because the hysteresis comparator and the current sampling circuit, namely the sampling resistor, are arranged in the switching regulator, extra power loss is increased, and the overall efficiency of the envelope tracking power supply is further reduced.
In view of this, embodiments of the present application provide an envelope tracking power supply, which is used to solve the technical problem that an additional power loss is increased when a current sampling circuit and a hysteresis comparator are arranged in a switching regulator of an existing envelope tracking power supply.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, 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 application.
Referring to fig. 4, 5 and 6, an envelope tracking power supply according to an embodiment of the present application includes a linear regulator and a switching regulator, where the linear regulator includes a multi-threshold comparator, a first digital control circuit and a power transistor unit, and the switching regulator includes a second digital control circuit, a driving circuit, a power transistor unit and an inductor;
the first input end of the first digital control circuit is connected with the first output end of the multi-threshold comparator, the first output end of the first digital control circuit is connected with the first input end of the power tube unit, and the second output end of the first digital control circuit is connected with the first input end of the second digital control circuit;
the first input end of the driving circuit is connected with the first output end of the second digital control circuit, and the first output end of the driving circuit is connected with the first input end of the power switch tube unit;
the first output end of the power switch tube unit is connected with the input end of the inductor.
It should be noted that the input signal of the linear regulator is the input envelope voltage VENVOutput voltage of VOUTOutput current is ILA. Input signal VENVAn input signal, an output signal V, also for an envelope tracking power supplyOUTThe output signal of the envelope tracking power supply is also. The multi-threshold comparator in this embodiment has N +1 positive thresholds, each of which is Vth0、Vth1、...VthN-1、VthNWherein V isth0<Vth1<...<VthN-1<VthN. The multi-threshold comparator also has N +1 negative thresholds, respectively-Vth0、-Vth1、...-VthN-1、-VthNwherein-VthN<-VthN-1<...<-Vth1<-Vth0. The multi-threshold comparator outputs a voltage VOUTAnd an input envelope voltage VENVIs compared with a plurality of set threshold values when V is less thanOUT-VENV<-VthjWhen (wherein-V)thjJ is more than or equal to j and less than or equal to N) of the jth negative threshold voltage, and a digital control signal is output through a first digital control circuit connected with the multi-threshold comparator to control the on and off of a power tube in the power tube unit; when V isOUT-VENV>VthjWhen (wherein V)thjJ is more than or equal to 0 and less than or equal to N) and outputs a digital control signal through a first digital control circuit to control the on and off of a power tube in a power tube unit, and a multi-threshold comparator outputs a voltage VOUTAnd an input voltage VENVThe difference value is compared with a plurality of threshold values set in the linear regulator, the comparison result is output, and then a digital control circuit generates a digital control signal to control the conduction quantity of the power tubes in the power tube unit, so that the output current I of the linear regulator can be controlledLAAnd the output voltage VOUTThe size of (2). By the above regulation process, the output voltage V of the linear regulator can be realizedOUTIs approximately equal to VENVThereby ensuring the tracking accuracy of the output envelope signal. The input signal of the switching regulator is a digital control signal generated by a first digital control circuit, and the output current is ISW. The second digital control circuit outputs a signal V according to the digital control signal output by the first digital control circuitPWMAnd the conduction of the switch tube in the power switch tube unit is controlled by the driving circuit to control the magnitude of the power inductive current, thereby controlling the output current ISWThe size of (2).
The envelope tracking power supply comprises a digital control linear regulator and a digital control switch regulator which are connected in parallel, and the input signal is input envelope voltage VENVOutput voltage of VOUTOutput current is IOUT＝ILA+ISW。ILAIs the output current of the linear regulator, ISWIs the output current of the switching regulator. The linear regulator in this application is responsible for regulating the output voltage VOUTTo make it track the input envelope voltage VENVThe linear regulator and the switching regulator are connected in parallel toThe output end load supplies power, the digital control switching regulator is responsible for providing the current of the middle-frequency power part and the low-frequency power part, and the digital control linear regulator is responsible for providing the current of the high-frequency power part, so that the bandwidth can be improved, and the efficiency can be optimized.
The embodiment of the application compares the difference value of the input envelope voltage and the output voltage with a plurality of threshold values through a multi-threshold comparator, obtains a plurality of digital control signals for controlling a power tube unit through a first digital control circuit to control the on-off number of MOS tubes in the power tube unit, thereby controlling the output voltage of the envelope tracking power supply to enable the output voltage of the envelope tracking power supply to be approximately equal to the input envelope voltage, controls the on-off of a switch tube in the power switch tube unit according to the digital control signal output by the first digital control circuit by utilizing a second digital control circuit to control the output current of a switch regulator, does not need to arrange a current sampling circuit and a hysteresis comparator in the switch regulator, simplifies the circuit design and reduces the power loss at the same time, thereby solving the problem that the existing envelope tracking power supply is provided with a current sampling circuit and a hysteresis comparator in the switch regulator, adding to the technical problem of additional power consumption.
The above is a detailed description of a first embodiment of an envelope tracking power supply provided herein, and the following is a detailed description of a second embodiment of an envelope tracking power supply provided herein.
Referring to fig. 4, 5 and 6, an envelope tracking power supply according to an embodiment of the present application includes a linear regulator and a switching regulator, where the linear regulator includes a multi-threshold comparator, a first digital control circuit and a power transistor unit, and the switching regulator includes a second digital control circuit, a driving circuit, a power transistor unit and an inductor;
the first input end of the first digital control circuit is connected with the first output end of the multi-threshold comparator, the first output end of the first digital control circuit is connected with the first input end of the power tube unit, and the second output end of the first digital control circuit is connected with the first input end of the second digital control circuit;
the first input end of the driving circuit is connected with the first output end of the second digital control circuit, and the first output end of the driving circuit is connected with the first input end of the power switch tube unit;
the first output end of the power switch tube unit is connected with the input end of the inductor.
It should be noted that the second digital control circuit in this embodiment includes a first inverter and an RS flip-flop.
Further, the power switch tube unit in this embodiment includes a MOS tube MPAnd MOS transistor MN；
MOS transistor MPGrid and MOS tube MNThe grid electrodes of the grid electrodes are all connected with the first output end of the driving circuit;
MOS transistor MPThe source electrode of the transistor is connected with a power supply;
MOS transistor MNIs grounded, and the MOS transistor MPDrain electrode of (1) and MOS transistor MNThe drains of which are connected to the input of the inductor.
Further, the power tube unit in the embodiment of the present application includes a plurality of rows of power tubes;
each column of power tubes comprises: MOS tube MPB1MOS tube MPCMOS tube MNCAnd MOS transistor MNB1；
MOS tube MPB1The source electrode of the MOS transistor is connected with a power supply, and the drain electrode of the MOS transistor is connected with an MOS transistor MPCA source electrode of (a);
MOS tube MNCDrain electrode of the MOS transistor MPCThe source electrode of the MOS transistor is connected with the MOS transistor MNB1A drain electrode of (1);
MOS tube MNB1The source of (2) is grounded;
MOS transistor MP of each rowCGate of (1) and each column of MOS transistor MNCThe gates of all the first and second digital control circuits are connected with the first output end of the first digital control circuit.
It should be noted that the power transistor unit in this embodiment includes N +1 power transistors, which are from the 0 th row to the nth row, and each power transistor includes a MOS transistor MPB1MOS tube MPCMOS tube MNCAnd MOS transistor MNB1。
Multi-threshold comparator collects output voltage V of envelope tracking power supplyOUTAnd will output the voltageVOUTAnd an input envelope voltage VENVThe difference value is compared with a plurality of set thresholds to obtain a comparison result, and the comparison result is generated by a first digital control circuit to respectively control the N +1 PMOS power tubes MPCAnd N +1 NMOS power tubes MNCN +1 bit digital control signal VPAnd N +1 bit digital control signal VN. When the digital control signal VP[j]When it is "0", the jth column PMOS power tube MPCConducting; when V isP[j]When the power is '1', the jth column PMOS power tube MPCIs turned off when VN[j]When the power is '1', the NMOS power tube MN in the jth columnCAnd conducting. VN[j]When the power is '0', the NMOS power tube MN in the jth columnCAnd (3) switching off, wherein j is more than or equal to 0 and less than or equal to N. Due to MPCAnd MPB1In series, MNCAnd MNB1In series, thus, MPB1On and off states of and MPCSame, MNB1On and off states of and MNCThe same is true. The multi-threshold comparator outputs a voltage VOUTAnd an input envelope voltage VENVThe difference value of the power tube unit is compared with a plurality of set threshold values, a plurality of digital control signals are generated through the first digital control circuit, and therefore the conduction quantity of PMOS power tubes and NMOS power tubes in the power tube unit can be controlled. As the number of PMOS power tubes increases, the output current ILAIs increased so that the output voltage V is increasedOUTIncreasing; as the number of the NMOS power tubes increases, the output current ILAIs reduced so that the output voltage V is reducedOUTAnd decreases.
The input signal of the switching regulator in the embodiment of the present application is a digital control signal V generated by a first digital control circuit in a linear regulatorP[0]And VN[0]Wherein, [0 ]]Indicating bit 0. The output current of the switching regulator is ISW. When V isP[0]V output by a second digital control circuit in the switching regulator is 0PWMWhen 1, the switch tube M in the power switch tube unitPOn, the power inductor current increases, thereby making the output current ISWIs also increased; when V isN[0]V output by a second digital control circuit in a switching regulator at 1PWMWhen it is 0, the power is onSwitch tube M in tube closing unitNOn, the power inductor current is reduced, so that the output current I is reducedSWAnd decreases. In addition, when VP [0 ]]When the output current is equal to 0, the PMOS power tube in the 0 th column of the power tube unit is conducted, and the output current I of the linear regulator isLAGreater than or equal to source current Ith_sc(ii) a When V isN[0]When the power transistor unit is equal to 1, the NMOS power transistor in the 0 th column of the power transistor unit is conducted, and the output current I of the linear regulator is obtainedLAIs less than or equal to-Ith_sn. Thus, the digital control signal V generated by the first digital control circuit in the linear regulatorP[0 and V ]N[0]Can reflect the output current I of the linear regulatorLAThe range of (3) is not required to be provided with a current sampling circuit in the switching regulator, and the second digital control circuit comprising the first inverter and the RS trigger replaces a hysteresis comparator in the traditional switching regulator, so that the power loss is reduced, and the overall efficiency of the envelope tracking power supply is improved.
Fig. 7 is a schematic flow chart of the output voltage control of the linear regulator. When the condition V is satisfiedOUT-VENV<-VthjWhen (wherein-V)thjJ is more than or equal to 0 and less than or equal to N) of the j-th negative threshold voltage, a digital control signal V is output through the first digital control circuitP[j]When the power transistor is 0, the jth column PMOS power transistor is conducted and outputs current ILAIncreasing, output voltage VOUTAnd (4) rising. When the current is not satisfied, the jth column PMOS power tube is turned off; when the condition V is satisfiedOUT-VENV>VthjWhen (wherein V)thjJ is more than or equal to 0 and less than or equal to N) of the positive threshold voltage, a digital control signal V is output through the first digital control circuitN[j]When the j column NMOS power tube is conducted, the current I is outputLAReducing, the output voltage VOUTAnd when the current is not satisfied, the NMOS power tube in the j column is turned off. Finally, the output voltage V of the linear regulator is adjusted through the adjusting processOUTApproximately equal to the input envelope voltage VENV。
Further, the embodiment of the present application further includes an MOS transistor MPB0；
MOS tube MPB0With each MOS transistor MPB1Forming a first current mirror;
MOS tube MPB0The source electrode of the transistor is connected with a power supply;
MOS tube MPB1Grid and MOS tube MPB0Grid of the MOS transistor MP and the MOS transistor MPB0Is connected to the drain of (1).
Further, the embodiment of the application also comprises a MOS (metal oxide semiconductor) transistor MNB0；
MOS tube MNB0And each MOS transistor MNB1Forming a second current mirror;
MOS tube MNB0The source of (2) is grounded;
MOS tube MNB1Grid and MOS tube MNB0The grid of the MOS transistor is connected with the MOS transistor MNB0Is connected to the drain of (1).
Further, the embodiment of the application also comprises a voltage-current conversion circuit;
the voltage-current conversion circuit, the plurality of first current mirrors and the plurality of second current mirrors form a bias current generation circuit;
the first output end of the voltage-current conversion circuit is connected with the MOS transistor MPB0The second output end of the drain electrode is connected with the MOS tube MNB0Of the substrate.
It should be noted that the present embodiment includes 1 MPB0And 1 MNB0MOS tube MPB0And each MOS tube MPB1Form a first current mirror, MOS transistor MNB0And each MOS transistor MNB1Forming a second current mirror.
It will be appreciated that the voltage to current conversion circuit tracks the output voltage V of the power supply in terms of the envelopeOUTAnd an input envelope voltage VENVThe difference value of the source current and the sink current is generated, and the source current and the sink current can be calculated through a preset formula.
The preset formula is as follows:
Ith_sc＝Ith_sn＝I0+|VENV-VOUT|/R；
wherein, Ith_scIs a source current, Ith_snFor sinking current, I0For a fixed current value, R is the conversion factor.
When the difference between the input envelope voltage and the output voltage becomes large, the source current Ith_scSink current Ith_snAnd also increases. Passing I through a first current mirrorth_scMirror image to PMOS power tube MPB1Passing I through a second current mirrorth_snMirror image to NMOS power tube MNB1. When V isP[j]When the power is low, the jth row PMOS power tube MPB1、MPC[ conducting, the current flowing through it is equal to Ith_sc(ii) a When V isN[j]When the power is high, the j-th row NMOS power tube MNB1[j]、MNC[j]Is turned on and a current equal to I flows through itth_sn. That is, the current on each column of power tubes is generated by the bias current generating circuit at the output voltage VOUTAnd an input envelope voltage VENVWhen the difference is large, the source current I is generatedth_scOr sink current Ith_snAnd the current on the power tube unit is increased, the output voltage slew rate is improved, and the tracking precision of the envelope tracking power supply to the envelope signal is increased.
The envelope tracking power supply provided by the embodiment of the application, wherein the linear regulator is still a main energy consumption module, the application adopts the digitally controlled linear regulator to realize bandwidth expansion and maintain high efficiency, the difference value of input envelope voltage and output voltage is compared with a plurality of threshold values through the multi-threshold comparator, a plurality of digital control signals for controlling the power tube unit are obtained through the first digital control circuit to control the on-off number of MOS tubes in the power tube unit, so that the output voltage of the envelope tracking power supply can be controlled to be approximately equal to the input envelope voltage, the digitally controlled linear regulator selects the on-off of PMOS tubes and NMOS tubes in the power tube unit according to the difference value of the output voltage and the input envelope voltage, and the output current of the linear regulator is increased or reduced in stages, thereby realizing the adjustment of the output voltage. And then the second digital control circuit is used for controlling the on-off of a switch tube in the power switch tube unit according to the digital control signal output by the first digital control circuit so as to control the output current of the switch regulator, and a current sampling circuit and a hysteresis comparator are not required to be arranged in the switch regulator, so that the power loss is reduced while the circuit design is simplified, and the technical problem that the additional power loss is increased because the current sampling circuit and the hysteresis comparator are arranged in the switch regulator of the conventional envelope tracking power supply is solved.
Compared with the existing analog linear regulator, the linear regulator in the application has the following advantages:
1. the output voltage has a larger slew rate;
2. because the power tube unit in the application has smaller gate capacitance, the bandwidth can be larger under the condition of the same power consumption;
3. under the wide output current range, a complex frequency compensation circuit is not needed, and the stable work of the output end is ensured. In addition, the current on the power tube unit is generated by mirror image bias current, the magnitude of the bias current is dynamically adjusted according to the difference value of the output voltage and the input envelope voltage, and when the difference value of the output voltage and the input envelope voltage is larger, larger I is generated by the voltage-current conversion circuitth_scAnd Ith_snTherefore, the current on the power tube unit is increased, the output voltage slew rate is improved, and the tracking precision of the envelope tracking power supply to the envelope signal is increased.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should 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 in the embodiments of the present application.
Claims (7)
1. An envelope tracking power supply comprising a linear regulator and a switching regulator, wherein the linear regulator comprises a multi-threshold comparator, a first digital control circuit and a power transistor unit, and the switching regulator comprises a second digital control circuit, a drive circuit, a power transistor unit and an inductor;
the first input end of the first digital control circuit is connected with the first output end of the multi-threshold comparator, the first output end of the first digital control circuit is connected with the first input end of the power tube unit, and the second output end of the first digital control circuit is connected with the first input end of the second digital control circuit;
the first input end of the driving circuit is connected with the first output end of the second digital control circuit, and the first output end of the driving circuit is connected with the first input end of the power switch tube unit;
and the first output end of the power switch tube unit is connected with the input end of the inductor.
2. The envelope tracking power supply of claim 1, wherein the power tube unit comprises a number of columns of power tubes;
each column of the power tubes comprises: MOS tube MPB1MOS tube MPCMOS tube MNCAnd MOS transistor MNB1；
The MOS tube MPB1The source electrode of the MOS transistor is connected with the power supply, and the drain electrode of the MOS transistor is connected with the MOS transistor MPCA source electrode of (a);
MOS manages MNCDrain electrode of the MOS transistor MP is connected with the MOS transistor MPCThe source electrode of the MOS transistor MN is connected with the drain electrode of the MOS transistor MNB1A drain electrode of (1);
MOS manages MNB1The source of (2) is grounded;
each row of MOS tubes MPCAnd each column of the MOS transistor MNCThe gates of all the first and second digital control circuits are connected with the first output end of the first digital control circuit.
3. The envelope tracking power supply of claim 2 further comprising a MOS transistor MPB0；
The MOS tube MPB0And each of the MOS transistors MPB1Forming a first current mirror;
the MOS tube MPB0The source electrode of the transistor is connected with a power supply;
the MOS tube MPB1And the MOS transistor MPB0The grid of the MOS transistor MP is connected with the MOS transistor MPB0Is connected to the drain of (1).
4. The envelope tracking power supply of claim 3 further comprising a MOS transistor MNB0；
MOS manages MNB0And each MOS transistor MNB1Forming a second current mirror;
MOS manages MNB0The source of (2) is grounded;
MOS manages MNB1And the MOS transistor MNB0The grid of the MOS transistor is connected with the MOS transistor MNB0Is connected to the drain of (1).
5. The envelope tracking power supply of claim 4 further comprising a voltage to current conversion circuit;
the voltage-current conversion circuit, the plurality of first current mirrors and the plurality of second current mirrors form a bias current generation circuit;
the first output end of the voltage-current conversion circuit is connected with the MOS transistor MPB0A second output end connected with the MOS transistor MNB0Of the substrate.
6. The envelope tracking power supply of claim 1 wherein the second digital control circuit comprises a first inverter and an RS flip-flop.
7. The envelope tracking power supply of claim 1 wherein the power switching transistor unit comprises a MOS transistor MPAnd MOS transistor MN；
The MOS tube MPAnd the MOS transistor MNThe grid electrodes of the grid electrodes are all connected with the first output end of the driving circuit;
the MOS tube MPThe source electrode of the transistor is connected with a power supply;
the MOS tube MNIs grounded, and the MOS transistor MNAnd the MOS transistor MPThe drains of which are connected to the input of the inductor.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106033953A (en) * | 2015-03-09 | 2016-10-19 | 中国科学院苏州纳米技术与纳米仿生研究所 | An envelope tracking amplifier and an amplifying circuit comprising the envelope tracking amplifier |
| CN107017765A (en) * | 2017-04-01 | 2017-08-04 | 唯捷创芯(天津)电子技术股份有限公司 | A kind of envelope tracking power supply, chip and communication terminal with series parallel structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106033953A (en) * | 2015-03-09 | 2016-10-19 | 中国科学院苏州纳米技术与纳米仿生研究所 | An envelope tracking amplifier and an amplifying circuit comprising the envelope tracking amplifier |
| CN107017765A (en) * | 2017-04-01 | 2017-08-04 | 唯捷创芯(天津)电子技术股份有限公司 | A kind of envelope tracking power supply, chip and communication terminal with series parallel structure |
| WO2018176968A1 (en) * | 2017-04-01 | 2018-10-04 | 唯捷创芯(天津)电子技术股份有限公司 | Envelope tracking power supply having series-parallel structure, chip, and communication terminal |
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