CN106559041B - A kind of bias control circuit and control method of radio-frequency power amplifier - Google Patents
A kind of bias control circuit and control method of radio-frequency power amplifier Download PDFInfo
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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
- H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
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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
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
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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
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
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Abstract
This application discloses a kind of bias control circuits of radio-frequency power amplifier, including controller and delay detection circuit.Controller includes a control circuit and multiple low-dropout regulators；Determine which low-dropout regulator is opened according to the output of each voltage comparator in delay detection circuit when control circuit works.The delay detection circuit includes a detecting circuit, a series connection bleeder circuit and at least one comparator.The detecting circuit includes diode one, resistance five and capacitor one.The series connection bleeder circuit provides at least one reference voltage value by multiple concatenated resistance.For each comparator there are two input terminal and an output end, one of input terminal receives the output voltage of detecting circuit, another input terminal receives some reference voltage value of series connection bleeder circuit, and output end connects the control circuit in controller.The application improves the efficiency of radio-frequency power amplifier under the premise of ensuring lower dynamic error amplitude of the vector always as far as possible.
Description
Technical field
This application involves a kind of bias control circuits of radio-frequency power amplifier, more particularly to a kind of penetrating for dynamic switch
The bias control circuit of frequency power amplifier.
Background technique
WLAN (wireless local area network, WLAN) uses time division duplex (time-
Division duplexing, TDD) mode, most general standard is 802.11 series standards that IEEE is defined, and meets the series
The wireless local area network technology of standard is known as WiFi.WLAN communication device has generally comprised radio frequency in the end of transmission channel
Power amplifier is sent to antenna for the power amplification for emitting signal to be met to mission need and externally emits.In order to save
Electricity, radio-frequency power amplifier are just opened when needing to send signal, without being shut off when sending signal.Therefore, wireless local area
Radio-frequency power amplifier in net communication device is in during dynamic switch.
Power amplifier is high power device, and work when needs to consume very big electric current, while generating many heats.
Power amplifier can undergo a temperature to rise to stable process from closing to unlatching.With the variation of temperature, power amplification
Many parameters such as gain, bias current of device etc. are all changing over time, and common is brilliant using GaAs hetero-junction bipolar
The power amplifier of body pipe (GaAs HBT) technique manufacture shows particularly evident.If the temperature in power amplifier is not yet steady
Timing just amplifies input signal, then the amplified signal exported will generate distorted signals.
Power amplifier uses Error Vector Magnitude (error vector magnitude, EVM) Lai Hengliang performance.Error
Amplitude of the vector is divided into two kinds --- static error amplitude of the vector and dynamic error amplitude of the vector.Static error amplitude of the vector refers to function
Rate amplifier is always on and is in the Error Vector Magnitude tested under stable state.Dynamic error amplitude of the vector refers to function
The Error Vector Magnitude that rate amplifier is tested during dynamic opens and closes.Obvious dynamic error amplitude of the vector can draw
Enter the time-variant nonlinear of power amplifier, it is higher compared to static error amplitude of the vector, while also closer to the radio frequency of dynamic switch
The actual working environment of power amplifier is used to measure the non-thread of the radio-frequency power amplifier in WLAN communication device
Property.Dynamic error amplitude of the vector is higher, indicates that linearity of radio-frequency power amplifier is poorer, vice versa.
With the progress of wireless local area network technology, wireless transmission rate is higher and higher, and higher transmission rate is by higher
What the modulation of rank and broader bandwidth were realized.Both of which requires the wireless signal sent to have higher papr
(peak-to-average power ratio, PAPR), this is also higher to the linearity of radio-frequency power amplifier.When adopting
When with lower order modulated, distorted signals caused by the time-variant nonlinear of power amplifier can also receive.When communication modulation order
After raising, the requirement to distorted signals is greatly improved, during must just taking method to reduce power amplifier dynamic switch
It is non-linear.For example, 802.11a agreement regulation highest uses 64 rank quadrature amplitude modulation (quadrature amplitude
Modulation, QAM), it is desirable that Error Vector Magnitude is up to -25dB.And 802.11ac agreement regulation highest is using 256 ranks just
The modulation of friendship amplitude, while Error Vector Magnitude being required to be up to -32dB.
Referring to Fig. 1, this is a kind of radio-frequency power amplifier of existing dynamic switch, mainly by controller, biased electrical
Road and amplifying circuit three parts are formed.The biasing of the radio-frequency power amplifier of controller i.e. existing dynamic switch controls
Circuit, mainly a low-dropout regulator (low-dropout regulator, LDO), input terminal is power amplifier
Open and close control port PAEN, output end are used to provide a steady dc voltage Vd for biasing circuit.Biasing circuit
For exporting stable bias current Ib to the base stage of power transistor according to DC voltage Vd.There are many realization sides for biasing circuit
Formula, Fig. 1 are only shown schematically one kind: DC voltage Vd passes through cascade one R1 of resistance, two Q2 of one Q1 of transistor and transistor
Ground connection, wherein the base stage of one Q1 of transistor and two Q2 of transistor and collector are shorted uses as diode.One Q1 of transistor
Collector connection three Q3 of transistor base stage, the collector of three Q3 of transistor connects operating voltage Vcc, emitter output biasing
Electric current Ib.Amplifying circuit includes one L1 of power transistor Q4, one C1 of capacitor and inductance.The base stage of power transistor Q4 passes through capacitor
One C1 connection rf inputs RFin, collector are also used as radio frequency to export by one L1 connection operating voltage Vcc of inductance, collector
Hold RFout, emitter ground connection.
The bias control circuit of the radio-frequency power amplifier of existing dynamic switch shown in FIG. 1, control method such as Fig. 2
It is shown.When the open and close control port PAEN of power amplifier receives open signal (for example, high level), low voltage difference
Voltage-stablizer is switched on and exports DC voltage Vd, and just output bias current Ib gives power transistor Q4 to biasing circuit therewith, amplification
Circuit begins to work.When the open and close control port PAEN of power amplifier receives shutdown signal (for example, low level)
When, low-dropout regulator is shut off and stops exporting DC voltage Vd, and biasing circuit just stops output bias current Ib therewith and gives
Power transistor Q4, amplifying circuit just stop working.
The bias control method of the radio-frequency power amplifier of existing dynamic switch shown in Fig. 2, the problem is that very
Difficulty obtains balance between efficiency and dynamic error amplitude of the vector.With the radio-frequency power amplifier in WLAN communication device
For, 1 (indicating to open power amplifier), which is set, from the open and close control port PAEN of power amplifier inputs to radiofrequency signal
There can be a time difference between power amplifier, this time difference is usually 0.2~1 μ s.By selecting low-dropout regulator
So that it is exported higher DC voltage Vd, the bias current Ib of power amplifier can be made higher, to there are more heats pair
Entire circuit is heated, and circuit is made to enter thermal steady state faster, to make power amplifier after radiofrequency signal input
The parameters such as gain it is more stable, excessive time-variant nonlinear will not be introduced, to guarantee lower dynamic error amplitude of the vector.However
Higher DC voltage Vd and bias current Ib is used to make the efficiency of power amplifier very low.If using lower direct current
Vd and bias current Ib is pressed, although efficiency can improve, power amplifier enters the heat-staple time can be very long, when radio frequency is believed
Power amplifier does not enter thermal steady state also when number input, the parameters such as gain of power amplifier be acted upon by temperature changes and
Changing, signal will be made to generate distortion.
In order to improve dynamic switch radio-frequency power amplifier dynamic error amplitude of the vector, some prior arts are mentioned
Out.
The Chinese invention patent application that application publication number is CN103368508A, data of publication of application is on October 23rd, 2013
In " radio-frequency power amplifier with low dynamic error vector magnitude ", disclose a kind of with lower dynamic error vector quantity
Be worth the radio-frequency power amplifier of (i.e. dynamic error amplitude of the vector), improved by providing variable supply voltage dynamic error to
Measure magnitude.The disadvantages of this solution is that there are first order amplifying circuit two transistors of stacked on top to need higher work electricity
Pressure, will receive limitation in the occasion for needing low voltage operating.
The Chinese invention patent application that application publication number is CN104467745A, data of publication of application is on March 25th, 2015
In " dynamic error vector magnitude duty cycle correction ", a kind of compensation dynamic error vector magnitude (i.e. dynamic error vector is disclosed
Amplitude) system, change the offset signal for being supplied to amplifier by the duty ratio of amplifier.The disadvantages of this solution is to correct
The size of signal is solely dependent upon duty ratio.In the case where duty ratio is certain, when correcting current that the program provides, is the same.But
Be power amplifier open and close control port PAEN enable signal in period very long and very short two kinds, although accounting for
For sky than the same, the situation that the temperature change of obvious power amplifier can be shorter than the period when period is very long is big, it is therefore desirable to
It is different when correcting current is obviously and the period is very short.
The Chinese invention patent application that application publication number is CN104753471A, data of publication of application is on July 1st, 2015
In " system, circuit and method about the correction of dynamic error vector magnitude ", a kind of correction dynamic error vector magnitude is disclosed
The system of (i.e. dynamic error amplitude of the vector) adjusts the offset signal of amplifying stage by generating correcting current.The disadvantages of this solution
It is to open each time and requires an additional smooth electric current, therefore the efficiency of meeting step-down amplifier.
Summary of the invention
The technical problem to be solved by the application is to provide a kind of biasing of the radio-frequency power amplifier of dynamic switch controls
Circuit not only has lower dynamic error amplitude of the vector, but also has taken into account efficiency.
In order to solve the above technical problems, the bias control circuit of radio-frequency power amplifier provided by the present application includes controller
With delay detection circuit.
The controller includes a control circuit and multiple low-dropout regulators；One input terminal of control circuit is function
The open and close control port of rate amplifier, remaining input terminal are the output ends of each voltage comparator in delay detection circuit,
Each output end of control circuit determines whether each low-dropout regulator is opened respectively；When the open and close control of power amplifier
When port processed receives open signal, control circuit work, and according to the output of each voltage comparator in delay detection circuit
Determine which low-dropout regulator is opened；When the open and close control port of power amplifier receives shutdown signal, control
Circuit processed does not work, and all low-dropout regulators are turned off；The output end of each low-dropout regulator is that biasing circuit mentions
For input voltage.
The delay detection circuit includes a detecting circuit, a series connection bleeder circuit and at least one comparator；Institute
Stating detecting circuit includes diode one, resistance five and capacitor one, the open and close of the anode connection power amplifier of diode one
Control port, the cathode of diode one is grounded by resistance five to be also grounded by capacitor one simultaneously, the cathode voltage of diode one
It is exactly the output voltage of detecting circuit；The series connection bleeder circuit provides at least one reference voltage by multiple concatenated resistance
Value；For each comparator there are two input terminal and an output end, one of input terminal receives the output voltage of detecting circuit,
Another input terminal receives some reference voltage value of series connection bleeder circuit, and output end connects the control circuit in controller.
Under the premise of what the application obtained has the technical effect that and ensure lower dynamic error amplitude of the vector always, improve as far as possible
The efficiency of radio-frequency power amplifier.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of the radio-frequency power amplifier of existing dynamic switch.
Fig. 2 is the bias control method flow chart of radio-frequency power amplifier in Fig. 1.
Fig. 3 is showing for the embodiment one of the bias control circuit of the radio-frequency power amplifier of dynamic switch provided by the present application
It is intended to.
Fig. 4 is the output voltage Vc of the detecting circuit in Fig. 3 and the open and close control port PAEN of power amplifier
The schematic diagram that input signal changes over time.
Fig. 5 is the bias control method flow chart of the radio-frequency power amplifier of dynamic switch provided by the present application.
Description of symbols in figure: PAEN is the open and close control port of power amplifier；RFin is that radiofrequency signal is defeated
Enter end；RFout is RF signal output；Vcc is operating voltage；Vd is the DC voltage of controller output；Vref is reference
Voltage；Ib is the bias current of biasing circuit output；Q is transistor；D is diode；LDO is low-dropout regulator；M1 is control
Circuit processed；R is resistance；C is capacitor；L is inductance.
Specific embodiment
Referring to Fig. 3, this is the reality of the bias control circuit of the radio-frequency power amplifier of dynamic switch provided by the present application
Example one is applied, is mainly made of controller and delay detection circuit two parts.
The controller includes a control circuit M1 and multiple low-dropout regulators, schematically shows four in Fig. 3
A low-dropout regulator LDO1 to LDO4.An input terminal of control circuit M1 is the open and close control port of power amplifier
PAEN, remaining input terminal are the output end of each voltage comparator in delay detection circuit, each output end of control circuit M1
Determine whether each low-dropout regulator is opened respectively.When the open and close control port PAEN of power amplifier receives unlatching
When signal (for example, high level), control circuit M1 work, and according to the output of each voltage comparator in delay detection circuit
Level determines which low-dropout regulator is opened, and any time only has a low-dropout regulator job at this time.When power is put
When the open and close control port PAEN of big device receives shutdown signal (for example, low level), control circuit M1 does not work, institute
Some low-dropout regulators are turned off.Preferably, the DC voltage of each low-dropout regulator output is different.Such as low pressure
Three LDO3's of output voltage > low-dropout regulator of two LDO2 of output voltage > low-dropout regulator of poor one LDO1 of voltage-stablizer
The output voltage of four LDO4 of output voltage > low-dropout regulator.
The delay detection circuit includes a detecting circuit, a series connection bleeder circuit and multiple comparators, is shown in Fig. 3
Represent three voltage comparator U1 to U3 to meaning property.The detecting circuit includes one D1 of diode, five R5 of resistance and capacitor one
The open and close control port PAEN of the anode connection power amplifier of C1, one D1 of diode, the cathode of one D1 of diode pass through
Five R5 of resistance ground connection is also grounded by one C1 of capacitor simultaneously.The cathode voltage of one D1 of diode is exactly the output voltage of detecting circuit
Vc.The series connection bleeder circuit divides operating voltage Vcc by multiple concatenated resistance, schematically shows in Fig. 3
Four concatenated resistance R1 to R4.One output reference voltage of dividing point, one Vref1 between two R2 of one R1 of resistance and resistance, resistance
The partial pressure between four R4 of two output reference voltage of dividing point two Vref2, three R3 of resistance and resistance between three R3 of two R2 and resistance
Point three output reference voltage, three Vref3.There are two input terminal and an output end, one of input terminations for each comparator
The output voltage Vc of detecting circuit is received, another input terminal receives the output voltage of some dividing point of series connection bleeder circuit,
Control circuit M1 output level of the output end into controller.
Input of the DC voltage Vd of controller output as biasing circuit, bias current that biasing circuit exports or
Bias voltage is supplied to the power transistor in amplifying circuit.Common biasing circuit first is that providing base stage for power transistor
Bias current, the biasing circuit of example as shown in figure 1.Common biasing circuit second is that for power transistor provide collector bias electricity
Pressure, it is not shown.Bias control circuit provided herein can connect any existing biasing circuit, and finally be any existing
Power transistor in some amplifying circuits provides bias current and/or bias voltage.
It is open signal or pass that the detecting circuit, which is used to detect the open and close control port PAEN of power amplifier,
Signal is closed, usual high level 1 indicates that open signal, low level 0 indicate shutdown signal.Referring to Fig. 4, this is the defeated of detecting circuit
The schematic diagram that the input signal of the open and close control port PAEN of voltage Vc and power amplifier changes over time out.Work as power
The open and close control port PAEN of amplifier becomes high level from low level at the ta moment, this is usually opening for power amplifier
Signal is opened, one D1 of the diode conducting in detecting circuit starts to charge to one C1 of capacitor.Due to the conducting resistance of one D1 of diode
Very little, one C1 of capacitor is fully charged quickly, and the output voltage Vc rapid increase of detecting circuit simultaneously reaches stable at the subsequent t1 moment
It is worth and remains unchanged.When the open and close control port PAEN of power amplifier becomes low level from high level at the tb moment, this
The usually shutdown signal of power amplifier, one D1 of the diode shutdown in detecting circuit, one C1 of capacitor begin to pass through resistance five
R5 electric discharge.Since the resistance value of five R5 of resistance is larger, the discharge process of one C1 of capacitor is slower, and the output voltage Vc of detecting circuit also delays
Slow decline.At the subsequent t2 moment, the output voltage Vc of detecting circuit drops to one Vref1 of reference voltage.In subsequent t3
It carves, the output voltage Vc of detecting circuit drops to two Vref2 of reference voltage.At the subsequent t4 moment, the output electricity of detecting circuit
Pressure Vc drops to three Vref3 of reference voltage.When the resistance value of determining, each resistance of operating voltage Vcc is determining, the capacitance of one C1 of capacitor is true
After fixed, each reference voltage value also determines that, and the difference at t2 moment and tb moment, the difference at t3 moment and tb moment,
The difference at t4 moment and tb moment also determines that.
Pass in the delay detection circuit between the output level of each comparator and the output voltage Vc of detecting circuit
System, can be indicated with the following table 1.Here still by taking three voltage comparator U1 to U3 shown in Fig. 3 as an example, and 1 indicates high electricity
Flat, 0 indicates low level.When the output voltage Vc of detecting circuit is higher than one Vref1 of reference voltage, three comparators export height
Level.When the output voltage Vc of detecting circuit is between two Vref2 of one Vref1 of reference voltage and reference voltage, comparator one
U1 exports low level, and two U2 of comparator and three U3 of comparator export high level.When the output voltage Vc of detecting circuit is in reference electricity
When pressing between three Vref3 of two Vref2 and reference voltage, one U1 of comparator and two U2 of comparator export low level, three U3 of comparator
Export high level.When the output voltage Vc of detecting circuit is lower than three Vref3 of reference voltage, three comparators export low electricity
It is flat.Certainly, in various embodiments, the relationship between the output level of each comparator and the output voltage Vc of detecting circuit
Adjustable variation does not need the example for being limited as table 1.
The relationship of the output voltage Vc of the output level and detecting circuit of each comparator of table 1
In embodiment one shown in Fig. 3, series connection bleeder circuit provides three reference voltage values, the output electricity of detecting circuit
Therefore pressure Vc is fallen in by these three reference voltage values as in four sections of boundary, as shown in table 1.In other embodiments,
If series connection bleeder circuit provides n reference voltage value, therefore the output voltage Vc of detecting circuit is fallen in by this n with reference to electricity
Pressure value is as in n+1 section of boundary.In order to provide n reference voltage value, bleeder circuit of connecting is for example by n+1 resistance string
Connection divides operating voltage Vcc, and comparator for example has n, and low-dropout regulator for example has n+1, and wherein n is nature
Number.
For the output voltage Vc voltage of detecting circuit if it is less than three Vref3 of reference voltage, this generally indicates that power amplifier
Open and close port PAEN for the first time have open signal or port PAEN after shutdown signal continue for the long period
Some open signals, at this time due to being all for a long time before shutdown signal, circuit heat is substantially all to be dispersed, therefore biased electrical
Road intentionally gets highest DC voltage Vd.The output level of each voltage comparator is, for example, 000 (the 4 of corresponding table 1 at this time
Row), maximum one LDO1 of low-dropout regulator of output voltage is only opened, remaining low-dropout regulator is closed.Low voltage difference pressure stabilizing
One LDO1 of device can make circuit most enter thermal steady state fastly, so that the gain of power amplifier is compared in radiofrequency signal input
Stablize, the distortion very little of output signal, dynamic error amplitude of the vector is very low.
The output voltage Vc voltage of detecting circuit is if it is greater than three Vref3 of reference voltage and is less than two Vref2 of reference voltage,
This generally indicates that the unlatching letter that the open and close port PAEN of power amplifier just has after shutdown signal continue for first time
Number, circuit heat, which not yet all disperses still, at this time small part remnants, therefore biasing circuit intentionally gets higher DC voltage
Vd.At this time the output level of each voltage comparator be, for example, 001 (the 3rd row of corresponding table 1), it is big only to open output voltage time
Two LDO2 of low-dropout regulator, closes remaining low-dropout regulator.
The output voltage Vc voltage of detecting circuit is if it is greater than two Vref2 of reference voltage and is less than one Vref1 of reference voltage,
This generally indicates that the unlatching letter that the open and close port PAEN of power amplifier just has after shutdown signal continue for for the second time
Number, the second time was less than at the first time, and circuit heat, which not yet all disperses still, at this time more remnants, therefore biasing circuit is wished
Obtain lower DC voltage Vd.The output level of each voltage comparator is, for example, 011 (the 2nd row of corresponding table 1) at this time, only
Small three LDO3 of low-dropout regulator of output voltage time is opened, remaining low-dropout regulator is closed.
For the output voltage Vc voltage of detecting circuit if it is greater than one Vref1 of reference voltage, this generally indicates that power amplifier
The open signal that just has after shutdown signal continue for the third time of open and close port PAEN, when the third time is less than second
Between, circuit heat does not disperse substantially at this time, is in close to heat-staple state, therefore biasing circuit intentionally gets minimum direct current
Voltage Vd.The output level of each voltage comparator is, for example, 111 (the 1st rows of corresponding table 1) at this time, only opens output voltage most
Small four LDO4 of low-dropout regulator, closes remaining low-dropout regulator.Four LDO4 of low-dropout regulator will not both have been introduced very
Big time-variant nonlinear, while radio-frequency power amplifier work can be made in high efficiency state again.
It needs to illustrate, in various embodiments, whether the unlatching of each low-dropout regulator and each comparator
Output level between the adjustable variation of relationship.Control circuit M1 in the controller is according to each in delay detection circuit
The output level of a voltage comparator determines which low-dropout regulator is opened, and total principle is: when the output of detecting circuit
Voltage is lower, and it is more thorough to show that the heat of entire radio-frequency power amplifier distributes, and is switched on to be rapidly achieved thermostabilization and mentions
For the low-dropout regulator of bigger output voltage, this is conducive to improve dynamic error amplitude of the vector.When the output electricity of detecting circuit
It presses higher, it is more remaining to show that the heat of entire radio-frequency power amplifier still has, need to only open to be rapidly achieved thermostabilization and mention
For the low-dropout regulator of smaller output voltage, lesser output voltage is conducive to improve the efficiency of radio-frequency power amplifier.
Referring to Fig. 5, this is the stream of the bias control method of the radio-frequency power amplifier of dynamic switch provided by the present application
Cheng Tu.Firstly, series connection bleeder circuit provides n reference voltage, n+1 electricity is gone out using this n reference voltage as boundary line delimitation
Between pressure area.Secondly, determining which low voltage difference is steady in controller according to the voltage range where the output voltage Vc of detecting circuit
Depressor is opened.When the voltage range where the output voltage Vc of detecting circuit is closer to operating voltage Vcc, it is switched on output voltage
Smaller low-dropout regulator, lesser output voltage, which not only can satisfy, is rapidly achieved heat-staple requirement, can also improve and penetrate
The efficiency of frequency power amplifier.When the voltage range where the output voltage Vc of detecting circuit is further away from operating voltage Vcc, just open
The bigger low-dropout regulator of output voltage is opened, to be rapidly achieved thermostabilization.The radio-frequency power of dynamic switch provided by the present application
The bias control method of amplifier can be such that radio-frequency power amplifies under any circumstance by exporting different DC voltage Vd
Device is rapidly achieved thermostabilization, to improve the dynamic error amplitude of the vector of radio-frequency power amplifier.Always ensuring lower move
Under the premise of state Error Vector Magnitude, input of the lesser DC voltage Vd as biasing circuit is also used as far as possible, thus as far as possible
Improve the efficiency of radio-frequency power amplifier.
The above is only preferred embodiment of the present application, it is not used to limit the application.Come for those skilled in the art
It says, various changes and changes are possible in this application.Within the spirit and principles of this application, made any modification, equivalent
Replacement, improvement etc., should be included within the scope of protection of this application.
Claims (9)
1. a kind of bias control circuit of radio-frequency power amplifier, characterized in that including controller and delay detection circuit；
The controller includes a control circuit and n+1 low-dropout regulator；One input terminal of control circuit is power
The open and close control port of amplifier, remaining input terminal are the output end of each voltage comparator in delay detection circuit, control
Each output end of circuit processed determines whether each low-dropout regulator is opened respectively；When the open and close of power amplifier controls
When port receives open signal, control circuit work, and determined according to the output of each voltage comparator in delay detection circuit
Which fixed low-dropout regulator is opened；When the open and close control port of power amplifier receives shutdown signal, control
Circuit does not work, and all low-dropout regulators are turned off；The output end of each low-dropout regulator does not mention for biasing circuit
For input voltage；
The delay detection circuit includes a detecting circuit, a series connection bleeder circuit and n comparator；The detecting circuit
Including diode one, resistance five and capacitor one, the open and close control port of the anode connection power amplifier of diode one, two
The cathode of pole pipe one is grounded by resistance five and is also grounded simultaneously by capacitor one, and the cathode voltage of diode one is exactly detecting circuit
Output voltage；The series connection bleeder circuit provides n reference voltage value by n+1 concatenated resistance；Each comparator has
Two input terminals and an output end, one of input terminal receive the output voltage of detecting circuit, another input terminal receives
Some reference voltage value of series connection bleeder circuit, output end connect the control circuit in controller；
The series connection bleeder circuit marks off n+1 voltage range according to n reference voltage；Where the output voltage of detecting circuit
Voltage range determine whether each comparator is opened, further determine which low-dropout regulator is opened in the controller
It opens；When the voltage range where the output voltage of detecting circuit is higher, it is switched on the smaller low-dropout regulator of output voltage；When
Voltage range where the output voltage of detecting circuit is lower, is switched on the bigger low-dropout regulator of output voltage.
2. the bias control circuit of radio-frequency power amplifier according to claim 1, characterized in that when power amplifier
When open and close control port receives open signal, any time only has a low-dropout regulator and opens.
3. the bias control circuit of radio-frequency power amplifier according to claim 1, characterized in that each low voltage difference pressure stabilizing
The DC voltage of device output is different.
4. the bias control circuit of radio-frequency power amplifier according to claim 1, characterized in that the detecting circuit is used
Come detect power amplifier open and close control port signal, the port be high level indicate open signal, which is
Low level indicates shutdown signal.
5. the bias control circuit of radio-frequency power amplifier according to claim 1, characterized in that the detecting circuit
In, the resistance value of resistance five is greater than the conducting resistance of diode one, therefore the charging time of capacitor one is less than discharge time.
6. the bias control circuit of radio-frequency power amplifier according to claim 4 or 5, characterized in that the detection electricity
Lu Zhong, when the open and close control port of power amplifier becomes high level from low level, the diode one in detecting circuit is led
It is logical, start to charge to capacitor one, the output voltage of detecting circuit rises and reaches stationary value and remains unchanged；Work as power amplifier
Open and close control port low level is become from high level, diode one in detecting circuit turns off, and capacitor one passes through resistance
Five electric discharges, the output voltage decline of detecting circuit.
7. a kind of bias control method of radio-frequency power amplifier, characterized in that the biasing of the radio-frequency power amplifier controls
Circuit includes controller and delay detection circuit；The controller includes a control circuit and n+1 low-dropout regulator；Control
Circuit processed determines whether each low-dropout regulator is opened；The delay detection circuit includes a detecting circuit, a series connection
Bleeder circuit and n comparator；
Firstly, the series connection bleeder circuit marks off n+1 voltage range according to n reference voltage；Secondly, according to detecting circuit
Output voltage where voltage range, determine whether each comparator is opened, further determine determine controller in which
A low-dropout regulator is opened；When the voltage range where the output voltage of detecting circuit is higher, it is smaller to be switched on output voltage
Low-dropout regulator；When the voltage range where the output voltage of detecting circuit is lower, it is switched on bigger low of output voltage
Pressure difference voltage-stablizer.
8. the bias control method of radio-frequency power amplifier according to claim 7, characterized in that defeated when detecting circuit
Voltage range out where voltage is lower, indicates that the heat of radio-frequency power amplifier distributes more, radio-frequency power amplifier
Just further away from thermal steady state, therefore the bigger low-dropout regulator of output voltage is opened to be rapidly achieved thermostabilization.
9. the bias control method of radio-frequency power amplifier according to claim 7, characterized in that defeated when detecting circuit
Voltage range out where voltage is higher, fewer, the radio-frequency power amplifier that indicates that the heat of radio-frequency power amplifier distributes
Just closer to thermal steady state, therefore open the smaller low-dropout regulator of output voltage, be rapidly achieved it is heat-staple simultaneously
Take into account efficiency.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019169592A1 (en) * | 2018-03-08 | 2019-09-12 | 海能达通信股份有限公司 | Radio frequency power amplifier circuit and output power switch control circuit and control method therefor |
| CN110247636B (en) * | 2018-03-08 | 2024-02-06 | 海能达通信股份有限公司 | Radio frequency power amplifier circuit, output power switch control circuit and control method thereof |
| CN110768630B (en) * | 2019-09-26 | 2023-05-26 | 广州慧智微电子股份有限公司 | Compensation circuit for amplitude modulation to amplitude modulation of radio frequency power amplifier |
| CN111030726B (en) * | 2019-12-13 | 2022-02-25 | 展讯通信（上海）有限公司 | Radio frequency front end control circuit and control method thereof, radio frequency front end control chip, system, storage medium and terminal |
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