CN109116907A - Negative pressure biasing circuit and power amplifier - Google Patents
Negative pressure biasing circuit and power amplifier Download PDFInfo
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- CN109116907A CN109116907A CN201810918564.1A CN201810918564A CN109116907A CN 109116907 A CN109116907 A CN 109116907A CN 201810918564 A CN201810918564 A CN 201810918564A CN 109116907 A CN109116907 A CN 109116907A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/567—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for temperature compensation
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Abstract
The present invention provides a kind of negative pressure biasing circuit and power amplifier, negative pressure biasing circuit includes: temperature sensing circuit, analog to digital conversion circuit and linear voltage-stabilizing circuit；Temperature sensing circuit connects linear voltage-stabilizing circuit by analog to digital conversion circuit；Temperature sensor is used to obtain the temperature signal of negative pressure biasing circuit ambient enviroment；Analog to digital conversion circuit is used to carry out analog-to-digital conversion to the temperature voltage signal to generate digital temperature signal；Linear voltage-stabilizing circuit for adjusting feedback voltage according to the digital temperature signal, and generates bias voltage relevant to temperature according to the feedback voltage.Negative pressure biasing circuit provided in an embodiment of the present invention, can make the grid voltage of power tube the bias voltage effect under variation with temperature and change, avoid influence of the temperature change to the output power of power amplifier, improve the performance of power amplifier, and circuit structure is simple, it is easy to accomplish.
Description
Technical field
The invention belongs to biasing circuit technical fields, are to be related to a kind of negative pressure biasing circuit and power is put more specifically
Big device.
Background technique
As the Typical Representative of third generation semiconductor material, there are wide bandgap semiconductor gallium nitride many silicon materials not have
Standby excellent properties are the defect semiconductor materials of high frequency, high pressure, high temperature and high-power applications.With gallium nitride technology into
Gradually mature and commercialization, the gallium nitride power semiconductor technology of step, especially major diameter silicon based gallium nitride epitaxy technology have become
For high-performance, the power technology solution of low cost.Gallium nitride power amplifier is widely used to power supply, honeycomb base at present
It stands, the various aspects such as satellite communication and phased-array radar.
But the device property based on gallium nitride power amplifier, under identical gate bias voltage, with temperature
It increases, the output power of power amplifier can be with becoming smaller, and then will lead to the degradation of gallium nitride power amplifier.How
The performance for improving gallium nitride power amplifier, becomes urgent problem to be solved.
Summary of the invention
The purpose of the present invention is to provide a kind of negative pressure biasing circuit and power amplifiers, it is intended to it solves in the prior art,
Gallium nitride power amplifier is under identical gate bias voltage, and with the raising of temperature, output power becomes smaller, and leads to gallium nitride function
The problem of degradation of rate amplifier.
To achieve the above object, the embodiment of the present invention provides a kind of negative pressure biasing circuit, comprising: temperature sensing circuit, mould
Number conversion circuit and linear voltage-stabilizing circuit；The temperature sensing circuit, for obtaining the temperature of negative pressure biasing circuit ambient enviroment
Signal, and the temperature signal is sent to analog-digital conversion circuit as described；Analog-digital conversion circuit as described, for the temperature electricity
It presses signal to carry out analog-to-digital conversion and generates digital temperature signal, and the digital temperature signal is sent to the linear voltage stabilization electricity
Road；The linear voltage-stabilizing circuit, for adjusting feedback voltage according to the digital temperature signal, and it is raw according to the feedback voltage
At bias voltage relevant to temperature.
Further, the negative pressure biasing circuit further include: voltage-regulating circuit；The voltage-regulating circuit, for giving birth to
The linear voltage-stabilizing circuit is sent at the first reference voltage, and by first reference voltage；The linear voltage-stabilizing circuit, also
For generating the bias voltage after the feedback voltage and first reference voltage are carried out differential amplification.
Further, the voltage-regulating circuit is connect with the analog-digital converter, is also used to generate the second reference voltage,
And second reference voltage is sent to the analog-digital converter；The analog-digital converter, for by the temperature signal with
Second reference voltage is compared, and obtains the digital temperature signal, and is sent to the linear voltage-stabilizing circuit.
Further, the analog-digital converter includes: multiple comparators；Second reference voltage includes multiple benchmark electricity
The first input end of each comparator is pressed to connect one to one respectively with multiple reference voltages, the of each comparator
Two input terminals are connect with the temperature signal；Each comparator is used for the temperature signal and the reference voltage being correspondingly connected with
It is compared, generates corresponding comparison result；Wherein, the digital temperature signal includes the corresponding relatively knot of each comparator
Fruit.
Further, the negative pressure biasing circuit further include: band-gap reference circuit；The band-gap reference circuit is used for root
The bandgap voltage reference is generated according to the control of selection signal and is sent to the voltage-regulating circuit, so that the voltage tune
Whole circuit generates first reference voltage or second reference voltage according to the bandgap voltage reference.
Further, the band-gap reference circuit includes: ground terminal, negative power end, positive temperature coefficient current source, trims electricity
Resistance circuit, negative temperature coefficient potential circuit；The ground terminal by negative temperature coefficient potential circuit, it is described trim resistance circuit and
Positive temperature coefficient current source is connect with negative power end；The resistance circuit that trims is connect with the voltage-regulating circuit, is used for root
The bandgap voltage reference is generated according to the control of selection signal and is sent to the voltage-regulating circuit；The voltage adjustment electricity
Road, for generating first reference voltage or second reference voltage according to the bandgap voltage reference.
Further, the resistance circuit that trims includes: selection signal input terminal, resistance string, selector and voltage output
End；The both ends of the resistance string are connect with the negative temperature coefficient potential circuit and the positive temperature coefficient current source respectively；Institute
It states selection signal input terminal to connect with the selector, the selection signal is simultaneously sent to by selection signal for receiving input
The selector；Each input terminal of the selector connects one to one with each divider node of the resistance string respectively,
The voltage that the selector is used to gate corresponding divider node according to the selection signal generates the bandgap voltage reference, and
The voltage-regulating circuit is sent to by the voltage output end.
Further, the resistance circuit that trims includes: multiple selection signal input terminals, multiple NOT gates, multiple switch pipe
With multiple resistance；One end of first resistor connects the negative temperature coefficient potential circuit, one end company of the other end and second resistance
It is connected to the first dividing point；The other end of the second resistance and one end of 3rd resistor are connected to the second dividing point；The third
One end of the other end of resistance and the 4th resistance is connected to third dividing point；The other end of 4th resistance and the 5th resistance
One end is connected to the 4th dividing point；The other end of 5th resistance and one end of the 6th resistance are connected to the 5th dividing point；Institute
One end of the other end and the 7th resistance of stating the 6th resistance is connected to the 6th dividing point；The other end and the 8th of 7th resistance
One end of resistance is connected to the 7th dividing point；The other end of 8th resistance and one end of the 9th resistance are connected to the 8th partial pressure
Point；The other end of 9th resistance connects the positive temperature coefficient current source；First dividing point passes sequentially through first and opens
Guan Guan, the 9th switching tube connect the voltage output end with the 13rd switching tube；Second dividing point passes sequentially through second and opens
Guan Guan, the 9th switching tube connect the voltage output end with the 13rd switching tube；The third dividing point passes sequentially through third and opens
Guan Guan, the tenth switching tube connect the voltage output end with the 13rd switching tube；4th dividing point passes sequentially through the 4th and opens
Guan Guan, the tenth switching tube connect the voltage output end with the 13rd switching tube；5th dividing point passes sequentially through the 5th and opens
Guan Guan, the 11st switching tube connect the voltage output end with the 14th switching tube；6th dividing point passes sequentially through the 6th
Switching tube, the 11st switching tube connect the voltage output end with the 14th switching tube；7th dividing point passes sequentially through
Seven switching tubes, the 12nd switching tube connect the voltage output end with the 14th switching tube；5th dividing point passes sequentially through
8th switching tube, the 12nd switching tube connect the voltage output end with the 14th switching tube；First selection signal input terminal is logical
Cross the first NOT gate be separately connected the grid of first switch tube, the grid of third switching tube, the 5th switching tube grid opened with the 7th
Close the grid of pipe；First selection signal is separately connected the grid of second switch by the first NOT gate and the second NOT gate, the 4th opens
Close grid, the grid of the 6th switching tube and the grid of the 8th switching tube of pipe；Second selection signal input terminal passes through third NOT gate
It is separately connected the grid of the 9th switching tube and the grid of the 11st switching tube；Second selection signal input terminal by third NOT gate with
4th NOT gate is separately connected the grid of the tenth switching tube and the grid of the 12nd switching tube；Third selection signal input terminal passes through the
Five NOT gates connect the grid of the 13rd switching tube；Third selection signal input terminal connect the tenth with the 6th NOT gate by the 5th NOT gate
The grid of four switching tubes.
Further, the linear voltage-stabilizing circuit includes: negative power end, ground terminal, adjustment pipe, error amplifier, feedback
Resistance and bias voltage output；Negative power end connects bias voltage output by adjusting pipe, and bias voltage output passes through
Feedback resistance connects ground terminal；The negative-phase input of the error amplifier is for inputting the first reference voltage, normal phase input end
The feedback resistance is connected, output end connects the grid of the adjustment pipe.
The embodiment of the present invention also provides a kind of power amplifier, including power tube, modulator circuit and generating positive and negative voltage are converted
Circuit, which is characterized in that further include negative pressure biasing circuit described in any of the above embodiments.
The beneficial effect of negative pressure biasing circuit and power amplifier provided in an embodiment of the present invention is: with prior art phase
Than negative pressure biasing circuit provided in an embodiment of the present invention obtains temperature signal by temperature sensing circuit, and analog to digital conversion circuit will
The temperature signal is converted to digital temperature signal, and the linear voltage-stabilizing circuit is generated according to the digital temperature signal and temperature
Relevant bias voltage, can make the grid voltage of power tube the bias voltage effect under variation with temperature and change, avoid
Influence of the temperature change to the output power of power amplifier, improves the performance of power amplifier, and circuit structure is simple, easily
In realization.
Detailed description of the invention
Fig. 1 is the structural block diagram of negative pressure biasing circuit provided in an embodiment of the present invention；
Fig. 2 is the structural block diagram of band-gap reference circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram provided in an embodiment of the present invention for trimming resistance circuit；
Fig. 4 is the circuit diagram of linear voltage-stabilizing circuit provided in an embodiment of the present invention；
Fig. 5 is the song that the bandgap voltage reference of band-gap reference circuit provided in an embodiment of the present invention output varies with temperature
Line；
Fig. 6 is the curve that the temperature signal of temperature sensing circuit provided in an embodiment of the present invention output varies with temperature；
Fig. 7 is the curve of the bias voltage over temperature variation of negative pressure biasing circuit provided in an embodiment of the present invention output.
Appended drawing reference: temperature sensing circuit 10, analog to digital conversion circuit 20, linear voltage-stabilizing circuit 30, voltage-regulating circuit 40,
Band-gap reference circuit 50, negative temperature coefficient potential circuit 51 trim resistance circuit 52, and positive temperature coefficient current source 53, error is put
Big device 31, adjusts pipe 32.
Specific embodiment
In order to which technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
Specific embodiment:
As shown in Figure 1, the embodiment of the present invention provides a kind of negative pressure biasing circuit, comprising: temperature sensing circuit 10, modulus turn
Change circuit 20 and linear voltage-stabilizing circuit 30；The temperature sensing circuit 10 is connect with analog-digital conversion circuit as described 20, for obtaining
The temperature signal of negative pressure biasing circuit ambient enviroment, and the temperature signal is sent to analog-digital conversion circuit as described 20；It is described
Analog to digital conversion circuit 20 is connect with the linear voltage-stabilizing circuit 30, for carrying out analog-to-digital conversion generation to the temperature voltage signal
Digital temperature signal, and the digital temperature signal is sent to the linear voltage-stabilizing circuit 30；The linear voltage-stabilizing circuit 30,
For adjusting feedback voltage according to the digital temperature signal, and biased electrical relevant to temperature is generated according to the feedback voltage
Pressure.
The course of work of the negative pressure biasing circuit are as follows: temperature sensing circuit 10 can be according to two bipolar transistors in electricity
The difference of the base-emitter voltage of the two diodes principle directly proportional to temperature generates positive temperature coefficient whens current density is not equal
Voltage, i.e., the described temperature signal, and the temperature signal is sent to analog-digital conversion circuit as described 20；The analog-to-digital conversion electricity
The temperature signal is compared by road 20 with a series of reference voltages, generates set of number signal, i.e., the described digital temperature letter
Number, and the digital temperature signal is sent to the linear voltage-stabilizing circuit 30；The linear voltage-stabilizing circuit 30 is according to the number
Word temperature signal adjusts the size of feedback resistance, obtains feedback voltage relevant to temperature, and by the feedback voltage and benchmark
Voltage generates bias voltage relevant to temperature after carrying out differential amplification by difference amplifier.
As shown in fig. 6, in the curve that the temperature signal that the temperature sensing circuit 10 generates varies with temperature, it is described
Temperature signal is to rise and the raised voltage signal of absolute value with temperature.
Negative pressure biasing circuit provided in an embodiment of the present invention obtains temperature signal by temperature sensing circuit 10, and modulus turns
It changes circuit 20 and the temperature signal is converted into digital temperature signal, the linear voltage-stabilizing circuit 30 is believed according to the digital temperature
Number relevant to temperature bias voltage is generated, can make the grid voltage of power amplifier in the case where the bias voltage is acted on temperature
Change and change, avoids influence of the temperature change to the output power of power amplifier, improve the performance of power amplifier, and
Circuit structure is simple, it is easy to accomplish.
In one embodiment, the negative pressure biasing circuit further include: voltage-regulating circuit 40；The voltage-regulating circuit
40 connect with the linear voltage-stabilizing circuit 30, for generating the first reference voltage, and first reference voltage are sent to institute
State linear voltage-stabilizing circuit 30；The linear voltage-stabilizing circuit 30, be also used to by the feedback voltage and first reference voltage into
The bias voltage is generated after row differential amplification.
Optionally, the voltage-regulating circuit 40 may include operational amplifier, resistance string and adjustment pipe 32；Resistance string with
Adjustment pipe 32 is connected in series to form the access from ground terminal to negative power end, and the negative-phase input of operational amplifier connects resistance string
In feedback node, constitute negative-feedback, normal phase input end connects bandgap voltage reference, other nodes of resistance string for generate with
The proportional reference voltage of bandgap voltage reference.
In one embodiment, the voltage-regulating circuit 40 is connect with the analog-digital converter, is also used to generate second
Reference voltage, and second reference voltage is sent to the analog-digital converter；The analog-digital converter is used for the temperature
Degree signal is compared with second reference voltage, generates the digital temperature signal, and the digital temperature signal is sent out
Give the linear voltage-stabilizing circuit.
Second reference voltage can be single voltage, can also be multiple voltages with different voltages value.
In one embodiment, the analog-digital converter includes: multiple comparators；Second reference voltage includes multiple
Reference voltage；The first input end of each comparator connects one to one with multiple reference voltages respectively, each ratio
The second input terminal compared with device is connect with the temperature signal；Each comparator be used for by the temperature signal be correspondingly connected with
Reference voltage is compared, and generates corresponding comparison result；The digital temperature signal includes the corresponding comparison of each comparator
As a result.
In one embodiment, the negative pressure biasing circuit further include: band-gap reference circuit 50；The band-gap reference circuit
50 connect with the voltage-regulating circuit 40, for generating the bandgap voltage reference according to the control of selection signal and being sent to
The voltage-regulating circuit 40, so that the voltage-regulating circuit 40 generates first base according to the bandgap voltage reference
Quasi- voltage or second reference voltage.
Optionally, the band-gap reference circuit 50 includes start-up circuit, positive temperature coefficient voltage generation circuit, negative temperature system
Number voltage generation circuit and add circuit；The start-up circuit drives the band gap for starting the band-gap reference circuit 50
Reference circuit 50 gets rid of degeneracy bias point；Positive temperature coefficient voltage generation circuit is for generating positive temperature coefficient voltage；Negative temperature
Coefficient voltages generative circuit is for generating negative temperature coefficient voltage；Add circuit be used for by the positive temperature coefficient voltage with it is described
Negative temperature coefficient voltage is added, and generates temperature independent bandgap voltage reference.
In one embodiment, as shown in Fig. 2, the band-gap reference circuit 50 includes: ground terminal, negative power end, positive temperature
Degree coefficient current source 53 trims resistance circuit 52, negative temperature coefficient potential circuit 51；Ground terminal passes through negative temperature coefficient voltage electricity
Road 51 described trims resistance circuit 52 and positive temperature coefficient current source 53 is connect with negative power end；It is described to trim resistance circuit 52
It is connect with the voltage-regulating circuit 40, temperature independent band-gap reference electricity is generated for the control according to selection signal
It presses and is sent to the voltage-regulating circuit 40；The voltage-regulating circuit 40, for being generated according to the bandgap voltage reference
First reference voltage proportional to the bandgap voltage reference or the second reference voltage.
The bandgap voltage reference for trimming the generation of resistance circuit 52 are as follows:
Wherein, VBEFor the junction voltage of the base-emitter of transistor, there is negative temperature coefficient；VTFor thermal voltage, have just
Temperature coefficient；RtrimTo trim resistance, R is resistance identical with resistance type is trimmed.
By the way that R is rationally arrangedtrimWith the ratio of R, the bandgap voltage reference of available zero-temperature coefficient；When because technique it is inclined
When the factors such as difference or device mismatch cause the bandgap voltage reference of output to deviate, change resistance by changing selection signal
RtrimResistance value, and then change bandgap voltage reference output valve, greatly improve output voltage precision.It is illustrated in figure 5 band
The curve that the bandgap voltage reference that gap reference circuit 50 exports varies with temperature.
In one embodiment, as shown in figure 3, the resistance circuit 52 that trims includes: selection signal input terminal, resistance
String, selector and voltage output end；The both ends of the resistance string respectively with the negative temperature coefficient potential circuit 51 and it is described just
Temperature coefficient current source 53 connects；The selection signal input terminal is connect with the selector, selection letter for receiving input
Number and the selection signal is sent to the selector；Each input terminal of the selector is each with the resistance string respectively
A divider node connects one to one, and the selector is used to gate the voltage of corresponding divider node according to the selection signal
The bandgap voltage reference is generated, and the voltage-regulating circuit 40 is sent to by the voltage output end.
By trimming resistance circuit 52 described in setting, the electric resistance partial pressure of different proportion can be formed according to selection signal, is adjusted
The size of whole output voltage, the influence that the factors such as process deviation and device mismatch of elimination generate bandgap voltage reference improve band
The output accuracy of gap benchmark.
In one embodiment, the resistance circuit 52 that trims includes: multiple selection signal input terminals, multiple NOT gates, more
A switching tube and multiple resistance；One end of first resistor R1 connects the negative temperature coefficient potential circuit 51, the other end and second
One end of resistance R2 is connected to the first dividing point；The other end of the second resistance R2 and one end of 3rd resistor R3 are connected to the
Two dividing points；The other end of the 3rd resistor R3 and one end of the 4th resistance R4 are connected to third dividing point；4th electricity
One end of the other end and the 5th resistance R5 that hinder R4 is connected to the 4th dividing point；The other end of the 5th resistance R5 and the 6th electricity
One end of resistance R6 is connected to the 5th dividing point；The other end of the 6th resistance R6 and one end of the 7th resistance R7 are connected to the 6th
Dividing point；The other end of the 7th resistance R7 and one end of the 8th resistance R8 are connected to the 7th dividing point；8th resistance
One end of the other end of R8 and the 9th resistance R9 are connected to the 8th dividing point；The other end connection of the 9th resistance R9 is described just
Temperature coefficient current source 53；First dividing point passes sequentially through first switch tube MP1, the 9th switching tube MP9 is opened with the 13rd
Close the pipe MP13 connection voltage output end；Second dividing point passes sequentially through second switch MP2, the 9th switching tube MP9
The voltage output end is connect with the 13rd switching tube MP13；The third dividing point passes sequentially through third switching tube MP3, the tenth
Switching tube MP10 connect the voltage output end with the 13rd switching tube MP13；4th dividing point passes sequentially through the 4th switch
Pipe MP4, the tenth switching tube MP10 connect the voltage output end with the 13rd switching tube MP13；5th dividing point successively leads to
It crosses the 5th switching tube MP5, the 11st switching tube MP11 and connect the voltage output end with the 14th switching tube MP14；Described 6th
Dividing point passes sequentially through the 6th switching tube MP6, the 11st switching tube MP11, and with the 14th switching tube MP14 to connect the voltage defeated
Outlet；7th dividing point passes sequentially through the 7th switching tube MP7, the 12nd switching tube MP12 and the 14th switching tube MP14 connects
Connect the voltage output end；5th dividing point passes sequentially through the 8th switching tube MP8, the 12nd switching tube MP12 and the 14th
The switching tube MP14 connection voltage output end；First selection signal input terminal is separately connected first by the first NOT gate INV1 and opens
Close the grid of pipe MP1, the grid of third switching tube MP3, the grid of the 5th switching tube MP5 and the grid of the 7th switching tube MP7；The
One selection signal is separately connected the grid of second switch MP2, the 4th switch by the first NOT gate INV1 and the second NOT gate INV2
The grid of the grid of pipe MP4, the grid of the 6th switching tube MP6 and the 8th switching tube MP8；Second selection signal input terminal passes through the
Three NOT gate INV3 are separately connected the grid of the 9th switching tube MP9 and the grid of the 11st switching tube MP11；Second selection signal is defeated
Enter grid and the 12nd switching tube that end is separately connected the tenth switching tube MP10 by third NOT gate INV3 and the 4th NOT gate INV4
The grid of MP12；Third selection signal input terminal passes through the grid of the 13rd switching tube MP13 of the 5th NOT gate INV5 connection；Third
Selection signal input terminal connect the grid of the 14th switching tube MP14 by the 5th NOT gate INV5 with the 6th NOT gate INV6.
The first switch tube MP1 to the 14th switching tube MP14 composition one eight selects one selector, optionally, described
Selector is also designed to 16 and selects one, 30 alternatives, so that the adjusting for trimming the partial pressure output of resistance is more accurate.
In one embodiment, as shown in figure 4, the linear voltage-stabilizing circuit 30 includes: negative power end, ground terminal, adjustment
Pipe 32, error amplifier 31, feedback resistance and bias voltage output；Negative power end is defeated by adjusting the connection bias voltage of pipe 32
Outlet, bias voltage output connect ground terminal by feedback resistance；The negative-phase input of the error amplifier 31 is for defeated
Enter the first reference voltage, normal phase input end connects the feedback resistance, and output end connects the grid of the adjustment pipe 32.
The bias voltage output is used to export the bias voltage that the linear voltage-stabilizing circuit 30 generates, the biased electrical
Pressure are as follows:
Wherein, VNLDOFor the bias voltage that linear voltage-stabilizing circuit 30 exports, VRFor the first reference voltage, Rf1For feedback resistance
In non-adjustable feedback resistance, Rf2For with Rf1Concatenated programmable feedback resistor.
Programmable feedback resistor Rf2It is adjusted, and then obtained according to the digital temperature signal that the analog-digital converter generates
The resistance varied with temperature can be such that power puts by formula (2) it is found that bias voltage relevant to temperature can be obtained at this time
The grid voltage of big device under the bias voltage effect variation with temperature and change, avoid temperature change to the defeated of power amplifier
The influence of power out improves the performance of power amplifier, is illustrated in figure 7 the bias voltage over temperature of negative pressure biasing circuit generation
The curve of variation.
The embodiment of the present invention also provides a kind of power amplifier, including power tube, modulator circuit and generating positive and negative voltage are converted
Circuit, which is characterized in that further include negative pressure biasing circuit described in any of the above embodiments.
Optionally, the power amplifier can be gallium nitride power amplifier.
In the present embodiment, generated by using the negative pressure biasing circuit that any of the above-described embodiment provides relevant to temperature inclined
Set voltage, can make the grid voltage of power amplifier the bias voltage effect under variation with temperature and change, avoid temperature
Change the influence to the output power of power amplifier, improves the performance of power amplifier, and negative pressure biasing circuit electricity
Line structure is simple, it is easy to accomplish.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of negative pressure biasing circuit characterized by comprising temperature sensing circuit, analog to digital conversion circuit and linear voltage stabilization electricity
Road；
The temperature sensing circuit, for obtaining the temperature signal of negative pressure biasing circuit ambient enviroment, and by the temperature signal
It is sent to analog-digital conversion circuit as described；
Analog-digital conversion circuit as described generates digital temperature signal for carrying out analog-to-digital conversion to the temperature voltage signal, and will
The digital temperature signal is sent to the linear voltage-stabilizing circuit；
The linear voltage-stabilizing circuit, for adjusting feedback voltage according to the digital temperature signal, and according to the feedback voltage
Generate bias voltage relevant to temperature.
2. negative pressure biasing circuit according to claim 1, which is characterized in that the negative pressure biasing circuit further include: voltage
Adjustment circuit；
The voltage-regulating circuit for generating the first reference voltage, and first reference voltage is sent to described linear
Voltage regulator circuit；
The linear voltage-stabilizing circuit is also used to generate after the feedback voltage is carried out differential amplification with first reference voltage
The bias voltage.
3. negative pressure biasing circuit according to claim 2, which is characterized in that
The voltage-regulating circuit is also used to generate the second reference voltage, and second reference voltage is sent to the mould
Number converter；
The analog-digital converter obtains the number for the temperature signal to be compared with second reference voltage
Temperature signal, and the digital temperature signal is sent to the linear voltage-stabilizing circuit.
4. negative pressure biasing circuit according to claim 3, which is characterized in that the analog-digital converter includes: multiple comparisons
Device；Second reference voltage includes multiple reference voltages；
The first input end of each comparator connects one to one with multiple reference voltages respectively, each comparator
Second input terminal is connect with the temperature signal；
Each comparator generates corresponding relatively knot for the temperature signal to be compared with the reference voltage being correspondingly connected with
Fruit；
Wherein, the digital temperature signal includes the corresponding comparison result of each comparator.
5. negative pressure biasing circuit according to claim 2 or 3, which is characterized in that the negative pressure biasing circuit further include: band
Gap reference circuit；
The band-gap reference circuit, for generating bandgap voltage reference according to the control of selection signal and being sent to the voltage tune
Whole circuit, so that the voltage-regulating circuit generates first reference voltage or described the according to the bandgap voltage reference
Two reference voltages.
6. negative pressure biasing circuit according to claim 5, which is characterized in that the band-gap reference circuit include: ground terminal,
Negative power end, trims resistance circuit and negative temperature coefficient potential circuit at positive temperature coefficient current source；
The ground terminal by negative temperature coefficient potential circuit, described trim resistance circuit and positive temperature coefficient current source and negative electricity
Source connection；
It is described to trim resistance circuit, for generating the bandgap voltage reference according to the control of selection signal and being sent to the electricity
Press adjustment circuit；
The voltage-regulating circuit, for generating first reference voltage or second base according to the bandgap voltage reference
Quasi- voltage.
7. negative pressure biasing circuit according to claim 6, which is characterized in that the resistance circuit that trims includes: selection letter
Number input terminal, resistance string, selector and voltage output end；
The both ends of the resistance string are connect with the negative temperature coefficient potential circuit and the positive temperature coefficient current source respectively；
The selection signal is simultaneously sent to the selection by the selection signal input terminal, selection signal for receiving input
Device；
Each input terminal of the selector connects one to one with each divider node of the resistance string respectively, the selection
The voltage that device is used to gate corresponding divider node according to the selection signal generates the bandgap voltage reference, and by described
Voltage output end is sent to the voltage-regulating circuit.
8. negative pressure biasing circuit according to claim 7, which is characterized in that the resistance circuit that trims includes: multiple choosings
Select signal input part, multiple NOT gates, multiple switch pipe and multiple resistance；
One end of one end connection negative temperature coefficient potential circuit of first resistor, the other end and second resistance is connected to first
Dividing point；The other end of the second resistance and one end of 3rd resistor are connected to the second dividing point；The 3rd resistor it is another
One end and one end of the 4th resistance are connected to third dividing point；The other end of 4th resistance is connect with one end of the 5th resistance
In the 4th dividing point；The other end of 5th resistance and one end of the 6th resistance are connected to the 5th dividing point；6th electricity
One end of the other end of resistance and the 7th resistance is connected to the 6th dividing point；The one of the other end of 7th resistance and the 8th resistance
End is connected to the 7th dividing point；The other end of 8th resistance and one end of the 9th resistance are connected to the 8th dividing point；It is described
The other end of 9th resistance connects the positive temperature coefficient current source；
First dividing point passes sequentially through first switch tube, the 9th switching tube and connect the voltage output with the 13rd switching tube
End；Second dividing point passes sequentially through second switch, the 9th switching tube and connect the voltage output with the 13rd switching tube
End；The third dividing point passes sequentially through third switching tube, the tenth switching tube and connect the voltage output with the 13rd switching tube
End；4th dividing point passes sequentially through the 4th switching tube, the tenth switching tube and connect the voltage output with the 13rd switching tube
End；5th dividing point passes sequentially through the 5th switching tube, the 11st switching tube, and with the 14th switching tube to connect the voltage defeated
Outlet；6th dividing point passes sequentially through the 6th switching tube, the 11st switching tube and connect the voltage with the 14th switching tube
Output end；7th dividing point passes sequentially through the 7th switching tube, the 12nd switching tube and connect the electricity with the 14th switching tube
Press output end；Described in 5th dividing point passes sequentially through the 8th switching tube, the 12nd switching tube is connect with the 14th switching tube
Voltage output end；
First selection signal input terminal be separately connected by the first NOT gate the grid of first switch tube, third switching tube grid,
The grid of 5th switching tube and the grid of the 7th switching tube；First selection signal is separately connected by the first NOT gate and the second NOT gate
The grid of second switch, the grid of the 4th switching tube, the grid of the 6th switching tube and the grid of the 8th switching tube；Second selection
Signal input part is separately connected the grid of the 9th switching tube and the grid of the 11st switching tube by third NOT gate；Second selection letter
Number input terminal is separately connected the grid of the tenth switching tube and the grid of the 12nd switching tube by third NOT gate and the 4th NOT gate；The
Three selection signal input terminals connect the grid of the 13rd switching tube by the 5th NOT gate；Third selection signal input terminal passes through the 5th
NOT gate connect the grid of the 14th switching tube with the 6th NOT gate.
9. negative pressure biasing circuit according to claim 1-3, which is characterized in that the linear voltage-stabilizing circuit packet
It includes: negative power end, ground terminal, adjustment pipe, error amplifier, feedback resistance and bias voltage output；
Negative power end connects bias voltage output by adjusting pipe, and bias voltage output is connected by feedback resistance and is grounded
End；
The negative-phase input of the error amplifier connects the feedback electricity for inputting the first reference voltage, normal phase input end
Resistance, output end connect the grid of the adjustment pipe.
10. a kind of power amplifier, including power tube, modulator circuit and positive-negative voltage conversion circuit, which is characterized in that also wrap
Include the described in any item negative pressure biasing circuits of claim 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810918564.1A CN109116907B (en) | 2018-08-13 | 2018-08-13 | Negative voltage bias circuit and power amplifier |
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| CN201810918564.1A CN109116907B (en) | 2018-08-13 | 2018-08-13 | Negative voltage bias circuit and power amplifier |
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| CN109116907B CN109116907B (en) | 2020-05-19 |
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| CN109947167A (en) * | 2019-03-14 | 2019-06-28 | 上海奥令科电子科技有限公司 | A kind of negative pressure linear voltage regulator |
| CN110011622A (en) * | 2019-04-15 | 2019-07-12 | 厦门雷迅科微电子股份有限公司 | A kind of biasing circuit of radio-frequency power amplifier |
| CN116088631A (en) * | 2023-04-11 | 2023-05-09 | 长鑫存储技术有限公司 | Power supply circuit and memory |
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| CN116088631A (en) * | 2023-04-11 | 2023-05-09 | 长鑫存储技术有限公司 | Power supply circuit and memory |
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| CN109116907B (en) | 2020-05-19 |
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