CN105720932A - Power amplifier adaptive to power supply voltage - Google Patents
Power amplifier adaptive to power supply voltage Download PDFInfo
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- CN105720932A CN105720932A CN201410728085.5A CN201410728085A CN105720932A CN 105720932 A CN105720932 A CN 105720932A CN 201410728085 A CN201410728085 A CN 201410728085A CN 105720932 A CN105720932 A CN 105720932A
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Abstract
The invention provides a power amplifier adaptive to a power supply voltage. The power amplifier comprises a voltage comparison module, which is used for comparing a first power supply voltage with each reference voltage in a plurality of reference voltages, and obtaining a plurality of comparison results; a current setting module, which is used for determining an output current value according to the plurality of comparison results; a linear transconductance circuit module, which is used for determining a grid voltage value of an output stage module according to the output current value; and the output stage module, which is used for outputting a corresponding static working current value according to the grid voltage value. The voltage comparison module can obtain different comparison results according to different values of the power supply voltages, so that the current setting module can determine diffident output current values, and finally, the linear transconductance circuit module can determine different grid voltages of an output stage according to different current values, so that the output stage can output different static working current values, and the range of the power supply voltage of the power amplifier can be effectively expanded.
Description
Technical field
The present invention relates to Analog Electronics Technique, particularly relate to the power amplifier of a kind of adaptive supply voltage.
Background technology
Power line carrier communication is a kind of communication mode utilizing this medium of electric lines of force to carry out carrier-wave transmission.Fast development along with network technology and information technology, domestic and international application low-voltage power line transfer rate is in the high speed power line ZAP of 1Mbps information, along with high speed power line carrier communication constantly improves, it is possible to transmit data, voice, video and electric power by an electric lines of force simultaneously.Wherein, power amplifier plays very important effect in power-line carrier communication system.In the power amplifiers, the grid voltage of power tube, as a controllable parameter, plays very important effect.Unstability due to electrical network, it is possible to can make the brownout that electrical network exports, if now the output-stage power pipe of power amplifier continues with the current work under normal condition before, then can cause bad impact to electronic device.
When supply voltage is on the low side, on market, the power amplifier for power line carrier link drive amplification all can set a brownout threshold voltage and hysteresis voltage, when supply voltage is lower than brownout threshold voltage, the output pipe of power amplifier is turned off, until supply voltage returns to more than hysteresis voltage and just opened by power tube.
But reduce, by prior art, the method that power amplifier is had undesirable effect, when supply voltage is lower than brownout threshold voltage, the output pipe of power amplifier tube turns off, namely the restriction value of now power amplifier output-stage electric current is 0%, and when supply voltage returns to more than hysteresis voltage, power tube is opened, namely the restriction value of now power amplifier output-stage electric current is 100%, namely reducing the method that power amplifier is had undesirable effect in prior art can make the output stage current value of power amplifier only exist 0% and 100% two kind of restriction value, so that the usable range of supply voltage is relatively small, limit the use field of power amplifier.
Summary of the invention
The embodiment of the present invention provides the power amplifier of a kind of adaptive supply voltage, to overcome the problem that power amplifier power supply voltage usable range of the prior art is little.
First aspect present invention provides the power amplifier of a kind of adaptive supply voltage, including:
Voltage comparison module, is used for receiving the first supply voltage, is compared respectively with each reference voltage in multiple reference voltages by described first supply voltage, obtains multiple comparative result, and export the plurality of comparative result to current settings module respectively；
Described current settings module, for receiving the plurality of comparative result of described voltage comparison module output, determines the output current value of described current settings module according to the plurality of comparative result, and by described output current value output to linear transconductance circuit module；
Described linear transconductance circuit module, for receiving the described output current value of described current settings module output, determines the input voltage value of described output level module according to described output current value, and by described input voltage value output to output level module；
Described output level module, the static working current value of the described input voltage value output correspondence for determining according to described linear transconductance circuit module；
Operation transconductance amplifier, the input of described operation transconductance amplifier connects signal to be amplified, and the outfan of described output transconductance amplifier connects the input of described output level module.
In the first possible implementation of first aspect, described voltage comparison module includes multiple hysteresis voltage comparator；
Multiple described hysteresis voltage comparators are connected in parallel, and the negative input end of each described hysteresis voltage comparator connects a reference voltage in the plurality of reference voltage respectively, and the positive input terminal of each described hysteresis voltage comparator connects described first supply voltage.
In conjunction with the first possible implementation of first aspect, in the implementation that the second of first aspect is possible, described current settings module includes switch element and sum unit；
Described switch element, for receiving the comparative result of each described hysteresis voltage comparator output, and exports corresponding current value according to each described comparative result to described sum unit；
Described sum unit, for the corresponding current value of each described switch element output is sued for peace, obtains output current value.
In conjunction with the implementation that the second of first aspect is possible, in the third possible implementation of first aspect, described switch element includes multiple switch, the input of each described switch and the outfan of a hysteresis voltage comparator connect, the input of each described switch is also connected with an input current, and the outfan of each described switch is connected with described sum unit；
If the described comparative result of described hysteresis voltage comparator output is 0, then switch off described in；
If the described comparative result of described hysteresis voltage comparator output is 1, then described switch Guan Bi, with the input current value corresponding with described switch to the output of described sum unit.
In the 4th kind of possible implementation of first aspect, the drain electrode of drain electrode and described N-channel enhancement mode MOSFET that described output level module includes P-channel enhancement type metal oxide semiconductor field effect tube MOSFET and N-channel enhancement mode MOSFET, described P-channel enhancement type MOSFET connects；
Described linear transconductance circuit module specifically for:
According to the described output current value that described current settings module is determined, it is determined that primary grid voltage corresponding for described P-channel enhancement type MOSFET and described second grid voltage corresponding for N-channel enhancement mode MOSFET；
The source electrode of described P-channel enhancement type MOSFET connects the second source voltage set, and the drain electrode of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET is connected, the source ground of described N-channel enhancement mode MOSFET.
In conjunction with the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation of first aspect, the outfan of described operation transconductance amplifier is connected with the grid of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET.
In conjunction with the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation of first aspect, also include: output stage overcurrent protection module, for described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET is carried out overcurrent protection；
The input of described output stage overcurrent protection module is connected with the drain electrode of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET；
The outfan of described output stage overcurrent protection module is connected with the grid of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET respectively.
In conjunction with in the 4th kind of possible implementation of first aspect, in the 7th kind of possible implementation of first aspect, described linear transconductance circuit module includes:
First current source, the second current source, the first bias voltage generation module, the second bias voltage generation module, the first floating voltage module, the second floating voltage module, the first power supply and the second power supply；
The input of described first current source connects power supply, the outfan of described first current source connects the first bias voltage generation module and the first floating voltage module, the outfan of described first floating voltage module connects the grid of described P-channel enhancement type MOSFET, described first bias voltage generation module and described first floating voltage wired in parallel；
The input of described second current source connects power supply, the outfan of described second current source connects the second bias voltage generation module and the second floating voltage module, the outfan of described second floating voltage module connects the grid of described N-channel enhancement mode MOSFET, described second bias voltage generation module and described second floating voltage wired in parallel.
The power amplifier of the adaptive supply voltage in the present invention, including: voltage comparison module, for receiving the first supply voltage, described first supply voltage is compared respectively with each reference voltage in multiple reference voltages, obtain multiple comparative result, and the plurality of comparative result is exported respectively to current settings module；Described current settings module, for receiving the plurality of comparative result of described voltage comparison module output, determines the output current value of described current settings module according to the plurality of comparative result, and by described output current value output to linear transconductance circuit module；Described linear transconductance circuit module, for receiving the described output current value of described current settings module output, determines the input voltage value of described output level module according to described output current value, and by described input voltage value output to output level module；Described output level module, the static working current value of the described input voltage value output correspondence for determining according to described linear transconductance circuit module；Operation transconductance amplifier, the input of described operation transconductance amplifier connects signal to be amplified, and the outfan of described output transconductance amplifier connects the input of described output level module.
Wherein, voltage comparison module can obtain different comparative results according to the different value of input supply voltage, so that current settings module can obtain different current values, linear transconductance circuit module is finally made to may determine that the different grid voltages of output stage according to different current values, so that the static working current value that output stage output is different, the scope of the supply voltage of the power amplifier effectively expanded, further expands the range of application of power amplifier.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation of the power amplifier of the adaptive supply voltage that Fig. 1 provides for the embodiment of the present invention；
The concrete structure schematic diagram of the voltage comparison module that Fig. 2 provides for the embodiment of the present invention；
The concrete structure schematic diagram of the current settings module that Fig. 3 provides for the embodiment of the present invention；
The structural representation of the producing method of the input current that the input of each switch that Fig. 4 provides for the embodiment of the present invention connects；
The concrete structure schematic diagram of the linear transconductance circuit module that Fig. 5 provides for the embodiment of the present invention；
The concrete structure schematic diagram of the output stage overcurrent protection module that Fig. 6 provides for the embodiment of the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
The structural representation of the power amplifier of the adaptive supply voltage that Fig. 1 provides for the embodiment of the present invention, as it is shown in figure 1, described adaptive supply voltage power amplifier 100 may include that
Voltage comparison module 101, for receiving the first supply voltage, described first supply voltage is compared respectively with each reference voltage in multiple reference voltages, obtains multiple comparative result, and the plurality of comparative result is exported respectively to current settings module 102.
Optionally, as shown in Figure 2, voltage comparison module 101 can include multiple hysteresis voltage comparator 1011, and multiple hysteresis voltage comparators 1011 are connected in parallel, difference according to practical application scene, multiple different reference voltage can be set, and the negative input end of each described hysteresis voltage comparator 1011 connects a reference voltage in multiple reference voltage respectively, concrete, first supply voltage can carry out dividing potential drop through resistance R1 and resistance R2, namely, magnitude of voltage after the dividing potential drop of what the positive input terminal of each described hysteresis voltage comparator 1011 connected is the first supply voltage, wherein, after the first source voltage that the positive input terminal of hysteresis voltage comparator 1011 connects
ValueWherein, VinIt it is the magnitude of voltage of the first supply voltage.
Wherein, voltage comparison module 101 is arranged the comparator with sluggishness in order that avoid the voltage dithering on electric lines of force and effect of noise and cause power tube switching back and forth between different states.
It should be noted that the difference of the reference voltage that the negative input end of adjacent two hysteresis voltage comparators 1011 connects should be greater than the hysteresis voltage value of hysteresis voltage comparator 1011.
Optionally, for each in multiple hysteresis voltage comparators 1011, the first supply voltage after the dividing potential drop that the reference voltage of negative input end connection connects more than positive input terminal, the outfan output low level of described hysteresis voltage comparator 1011, namely, outfan output " 0 " of hysteresis voltage comparator 1011, the first supply voltage after the dividing potential drop that the reference voltage of negative input end connection connects less than positive input terminal, the outfan output high level of described hysteresis voltage comparator 1011, that is, outfan output " 1 " of hysteresis voltage comparator 1011.
Described current settings module 102, for receiving the plurality of comparative result of described voltage comparison module 101 output, the output current value of described current settings module 102 is determined according to the plurality of comparative result, and by described output current value output to linear transconductance circuit module 103.
Optionally, as shown in Figure 3, described current settings module 102 can include switch element 1021 and sum unit 1022, described switch element 1021, including multiple switches, for receiving the comparative result of each described hysteresis voltage comparator 1011 output, and export the current value of correspondence to described sum unit 1022 according to each described comparative result；
Described sum unit 1022, for the corresponding current value that each described switch element 1021 is exported is sued for peace, obtains output current value.
Concrete, described switch element 1021 includes multiple switch, the input of each described switch and the outfan of a hysteresis voltage comparator 1021 connect, and the input of each described switch is also connected with an input current, and the outfan of each described switch is connected with described sum unit 1022；Wherein, input 1, input 2 ... input the output result of hysteresis voltage comparator 1011 respectively corresponding for N, and electric current 1, electric current 2 ... electric current N respectively should export the current value to sum unit 1022 after corresponding switch Guan Bi.
If the described comparative result of described hysteresis voltage comparator 1011 output is 1, then described switch Guan Bi；If described comparative result is 0, then described switch off, and the corresponding current value of circuit that each switch is corresponding, when after switch Guan Bi, the input current value that this way switch is corresponding exports to sum unit 1022, so that described sum unit 1022 is according to described current value, try to achieve the current value that current settings module 102 should export.
In the attainable mode of one of the present invention, the producing method of the input current that the input of each switch connects can be as shown in Figure 4, wherein, bias current can be produced by current biasing circuit, electric current 1, electric current 2 ... electric current N are the current value obtained according to certain scaled mirror by bias current by current mirror, the ratio of its mirror image can be adjusted according to practical application scene, it is not any limitation as by the present invention, further, the producing method of the input current that the input of each switch connects is not any limitation as by the present invention.
Such as, voltage comparison module has 3 hysteresis voltage comparators, respectively CMP1, CMP2 and CMP3, current settings module then has three switches, respectively S1, S2 and S3, wherein, the input of S1 and the outfan of CMP1 connect, the input of S2 and the outfan of CMP2 connect, the input of S3 and the outfan of CMP3 connect, S1, the outfan of S2 and S3 is connected to sum unit, assume S1, after S2 and S3 Guan Bi, the current value that place circuit correspondence flows through is 1 μ A, and CMP1 is output as low level 0, CMP2 is output as high level 1, CMP3 is output as high level 1, then according to CMP1, the output result of CMP2 and CMP3 is known, S1 disconnects, S2 and S3 closes, circuit communication corresponding to S2 and S3, electric current flow to sum unit, sum unit now determines that the output electric current of current settings module is the current value sum flowed through that S2 and S3 place circuit is corresponding, namely 2 μ A.
It should be noted that in actual applications, after each switch Guan Bi, the current value that each switch place circuit correspondence flows through can be different, and the present invention is not to after each switch Guan Bi, and the size of the current value flowed through is any limitation as.
Described linear transconductance circuit module 103, for receiving the described output current value of described current settings module 102 output, the input voltage value of described output level module 104 is determined according to described output current value, and by described input voltage value output to output level module 104.
Described output level module 104, the static working current value of the described input voltage value output correspondence for determining according to described linear transconductance circuit module 103.
Optionally, as in figure 2 it is shown, described output level module 104 include P-channel enhancement type metal oxide semiconductor field effect tube (Metal-Oxide-SemiconductorField-EffectTransistor, referred to as: MOSFET), hereinafter referred to as MP；N-channel enhancement mode MOSFET, hereinafter referred to as MN.The drain electrode of described MP connects with the drain electrode of described MN.
Optionally, described linear transconductance circuit module 103 is specifically for the described output current value determined according to described current settings module 102, it is determined that the second grid voltage that primary grid voltage corresponding for described MP is corresponding with described MN；
The source electrode of described MP connects the second source voltage set, and the drain electrode of described MP and described MN is connected, the source ground of described MN.
Concrete, according to the description above it can be seen that when the outfan of power amplifier does not connect load, the electric current of MP flows into the drain electrode of MN by the drain electrode of MP, the source electrode being then passed through MN flows into ground, that is, the static working current value that current value is power amplifier now.
Further, as it is shown in figure 5, described linear transconductance circuit module 103 may include that
First bias voltage generation module 1031a, the second bias voltage generation module 1031b, the first floating voltage module 1032a, the second floating voltage module 1032b, the first current source 1033a, the second current source 1033b, linear transconductance circuit module power supply 1034；
The input connecting linear conduction-cross circuit module power supply 1034 of described first bias voltage generation module 1031a, the input of described first current source 1033a connects the outfan of the first bias voltage generation module 1031a and the input of the first floating voltage module 1032a, the output head grounding of described first current source 1033a, the outfan of described first floating voltage module 1032a connects the grid of the MP of output level module 104；
The input connecting linear conduction-cross circuit module power supply 1034 of described second current source 1033b, the outfan of described second current source 1033b connects the input of the second bias voltage generation module 1031b and the input of the second floating voltage module 1032b, and the outfan of described second floating voltage module 1032b connects the grid of the MN of output level module 104.
Wherein, the output current value that the current value that the first current source 1033a and the second current source 1033b sets is determined as current settings module 102.
Such as, when the output current value of current settings module settings is 2 μ A, then now the current value of 2 μ A flows into linear conduction-cross circuit module, the bias voltage V that the first bias voltage generation module in the corresponding linear conduction-cross circuit module of the current value of 2 μ A and the second bias voltage generation module produce in linear conduction-cross circuit moduleBIAS1And VBIAS2Being 2V, the voltage VF1 of the first floating voltage module is the voltage of 1.4V and the second floating voltage module be VF2 is 0.5V, and voltage VDD1 and the VDD2 respectively 12V of linear transconductance circuit module power supply, then corresponding for MN grid voltage is VBIAS1The magnitude of voltage that grid that-VF1=0.6V, MP are corresponding is corresponding is VDD-VBIAS2+ VF2=10.5V.
It should be noted that, the circuit structure of the structural representation of modules involved in the embodiment of the present invention, it circuit components therein can be changed according to actual demand or increase circuit components therein, as long as can reach in this inventive embodiments the output result required for modules.
Operation transconductance amplifier 105, the input of described operation transconductance amplifier 105 connects signal to be amplified, and the outfan of described operation transconductance amplifier 106 connects the input of described output level module 104.
Optionally, the outfan of described operation transconductance amplifier 105 is connected with the grid of described MP and described MN.
In actual application, the input of the operation transconductance amplifier 105 of output level module 104 front portion can connect signal to be amplified so that the signal to be amplified after the outfan output processing of output level module 104, that is, the signal after output amplification.
Concrete, described operation transconductance amplifier 105 and output level module 104 constitute the power amplifier with two grades of enlarging functions, first the signal to be amplified of input can be carried out anti-phase amplification by operation transconductance amplifier 105, then the signal input after anti-phase amplification is carried out secondary amplification to output level module 104, signal after amplifying is carried out anti-phase amplification by output level module 104 again, now just can export the signal after the amplification identical with signal phase to be amplified.
Further, as it is shown in figure 1, the merit power amplifier 100 of described adaptive supply voltage also includes: output stage overcurrent protection module 106, for described MP and described MN is carried out overcurrent protection.
Concrete, the input of described output stage overcurrent protection module 106 is connected with the drain electrode of described MP and described MN, and the outfan of described output stage overcurrent protection module 106 is connected with the grid of described MP and described MN respectively.
Further; as shown in Figure 6; described output stage overcurrent protection module 106 specifically includes: power tube current sample rate current 1061, power tube maximum current initialization circuit 1062 and control circuit 1063; wherein the sample mode of the actual output current of power tube can be by power tube sample circuit 1061: is sampled by the voltage that power tube is drained, and just can learn the actual output current value I of power tubeActual, and power tube maximum current initialization circuit 1062 is used for determining power tube exportable maximum current value I in normal operationmax, control circuit 1063 is used for comparing IActualWith ImaxMagnitude relationship, and control the working method of grid of power tube according to magnitude relationship, work as IActualMore than ImaxTime, control circuit 1063 turns off power tube, that is, the grid voltage by MN pipe is pulled to low level, the grid voltage of MP pipe is pulled to high level, and works as IActualLess than ImaxTime, power tube is not done any process by control circuit 1063.
Concrete, it is assumed that in the prior art, when the magnitude of voltage after source voltage is less than 1.154V, power amplifier output-stage automatically shuts down；When the magnitude of voltage after source voltage is more than 1.154V+Vsys, power amplifier output-stage conducting (wherein Vsys is hysteresis voltage).For above-mentioned power amplifier of the prior art, embodiments provide a kind of specific embodiment, for expanding the use scope of the supply voltage of above-mentioned prior art intermediate power amplifier, the present embodiment arranges 4 hysteresis voltage comparators, respectively CMP1, CMP2, CMP3 and CMP4, and 4 different reference voltages are set, represent below with reference to voltage Vref, concrete, 4 the reference voltage respectively Vref1 arranged in the present embodiment, Vref2, Vref3 and Vref4, the negative input end of CMP1 connects Vref1, the negative input end of CMP2 connects Vref2, the negative input end of CMP3 connects Vref3, the negative input end of CMP4 connects Vref4, the hysteresis voltage assuming hysteresis voltage comparator is 20mV, and the difference of the reference voltage that adjacent two hysteresis voltage comparator negative input ends connect is 64mV, i.e. Vref1=0.962V, Vref2=1.026V, Vref3=1.090V, Vref4=1.154V, when the value after the source voltage that the positive input terminal of hysteresis voltage comparator connects is 1.054V, now the value 1.054V after source voltage is less than 1.154V, will direct switch-off power amplifier output stage in prior art, power amplifier quits work, and the power amplifier of adaptive supply voltage provided by the invention, when the value after source voltage is 1.054V, power amplifier still works, and do not turn off, particularly as follows:
For CMP1, the reference voltage level that negative input end connects is 0.962V, value after the source voltage that positive input terminal connects is 1.054V, and the value 1.054V after the source voltage that the reference voltage level 0.962V that negative input end connects connects less than positive input terminal, the then outfan output high level of CMP1, namely output " 1 "；For CMP2, the reference voltage level that negative input end connects is 1.026V, value after the source voltage that positive input terminal connects is 1.054V, and the value 1.054V after the source voltage that the reference voltage level 1.026V that negative input end connects connects less than positive input terminal, the then outfan output high level of CMP2, namely output " 1 ", the ratio of CMP3 and CMP4 and CMP1 and CMP2 is relatively similar, do not repeat one by one herein, then, the outfan output low level of CMP3, namely output " 0 ", the outfan output low level of CMP4, namely output " 0 ", switch Guan Bi corresponding with CMP1 in current settings module, the switch Guan Bi corresponding with CMP2, corresponding with CMP3 switches off, corresponding with CMP4 switches off, after assuming switch Guan Bi corresponding for CMP1, the current value that this switch place circuit passes through is I1After switch Guan Bi corresponding for=10 μ A, CMP2, the current value that this switch place circuit passes through is I2=10 μ A, then the output current value of current settings module is I1And I2Sum, i.e. 20 μ A, then by this current value input to linear transconductance circuit module, according to the current value of input, linear transconductance circuit module determines that the input voltage value that the grid of MP and MN in output level module is corresponding is 10.5V and 0.6V, and now the static working current value of output level module is 50 μ A.According to above-mentioned analysis, when being divided to the supply voltage of described power amplifier less than 1.154V, power amplifier provided by the invention still can normally use, the current value simply now exported less than when the supply voltage being divided to described power amplifier be current value during 1.154V.
The embodiment of the present invention provides the power amplifier of a kind of adaptive supply voltage, including: voltage comparison module, for receiving the first supply voltage, described first supply voltage is compared respectively with each reference voltage in multiple reference voltages, obtain multiple comparative result, and the plurality of comparative result is exported respectively to current settings module；Described current settings module, for receiving the plurality of comparative result of described voltage comparison module output, determines the output current value of described current settings module according to the plurality of comparative result, and by described output current value output to linear transconductance circuit module；Described linear transconductance circuit module, for receiving the described output current value of described current settings module output, determines the input voltage value of described output level module according to described output current value, and by described input voltage value output to output level module；Described output level module, the static working current value of the described input voltage value output correspondence for determining according to described linear transconductance circuit module；Operation transconductance amplifier, the input of described operation transconductance amplifier connects signal to be amplified, and the outfan of described output transconductance amplifier connects the input of described output level module.
Wherein, voltage comparison module can obtain different comparative results according to the different value of input supply voltage, so that current settings module can obtain different current values, linear transconductance circuit module is finally made to may determine that the different grid voltages of output stage according to different current values, so that the static working current value that output stage output is different, the scope of the supply voltage of the power amplifier effectively expanded, further expands the range of application of power amplifier.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (8)
1. the power amplifier of an adaptive supply voltage, it is characterised in that including:
Voltage comparison module, is used for receiving the first supply voltage, is compared respectively with each reference voltage in multiple reference voltages by described first supply voltage, obtains multiple comparative result, and export the plurality of comparative result to current settings module respectively；
Described current settings module, for receiving the plurality of comparative result of described voltage comparison module output, determines the output current value of described current settings module according to the plurality of comparative result, and by described output current value output to linear transconductance circuit module；
Described linear transconductance circuit module, for receiving the described output current value of described current settings module output, determines the input voltage value of described output level module according to described output current value, and by described input voltage value output to output level module；
Described output level module, the static working current value of the described input voltage value output correspondence for determining according to described linear transconductance circuit module；
Operation transconductance amplifier, the input of described operation transconductance amplifier connects signal to be amplified, and the outfan of described output transconductance amplifier connects the input of described output level module.
2. the power amplifier of adaptive supply voltage according to claim 1, it is characterised in that described voltage comparison module includes multiple hysteresis voltage comparator；
Multiple described hysteresis voltage comparators are connected in parallel, and the negative input end of each described hysteresis voltage comparator connects a reference voltage in the plurality of reference voltage respectively, and the positive input terminal of each described hysteresis voltage comparator connects described first supply voltage.
3. the power amplifier of adaptive supply voltage according to claim 2, it is characterised in that described current settings module includes switch element and sum unit；
Described switch element, for receiving the comparative result of each described hysteresis voltage comparator output, and exports corresponding current value according to each described comparative result to described sum unit；
Described sum unit, for the corresponding current value of each described switch element output is sued for peace, obtains output current value.
4. the power amplifier of adaptive supply voltage according to claim 3, it is characterized in that, described switch element includes multiple switch, the input of each described switch and the outfan of a hysteresis voltage comparator connect, the input of each described switch is also connected with an input current, and the outfan of each described switch is connected with described sum unit；
If the described comparative result of described hysteresis voltage comparator output is 0, then switch off described in；
If the described comparative result of described hysteresis voltage comparator output is 1, then described switch Guan Bi, with the input current value corresponding with described switch to the output of described sum unit.
5. the power amplifier of adaptive supply voltage according to claim 1, it is characterized in that, the drain electrode of drain electrode and described N-channel enhancement mode MOSFET that described output level module includes P-channel enhancement type metal oxide semiconductor field effect tube MOSFET and N-channel enhancement mode MOSFET, described P-channel enhancement type MOSFET connects；
Described linear transconductance circuit module specifically for:
According to the described output current value that described current settings module is determined, it is determined that primary grid voltage corresponding for described P-channel enhancement type MOSFET and described second grid voltage corresponding for N-channel enhancement mode MOSFET；
The source electrode of described P-channel enhancement type MOSFET connects the second source voltage set, and the drain electrode of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET is connected, the source ground of described N-channel enhancement mode MOSFET.
6. adaptive supply voltage power amplifier according to claim 5, it is characterised in that the outfan of described operation transconductance amplifier is connected with the grid of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET.
7. adaptive supply voltage power amplifier according to claim 5, it is characterised in that also include: output stage overcurrent protection module, for carrying out overcurrent protection to described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET；
The input of described output stage overcurrent protection module is connected with the drain electrode of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET；
The outfan of described output stage overcurrent protection module is connected with the grid of described P-channel enhancement type MOSFET and described N-channel enhancement mode MOSFET respectively.
8. adaptive supply voltage power amplifier according to claim 5, it is characterised in that described linear transconductance circuit module includes:
First current source, the second current source, the first bias voltage generation module, the second bias voltage generation module, the first floating voltage module, the second floating voltage module, the first power supply and the second power supply；
The input of described first current source connects power supply, the outfan of described first current source connects the first bias voltage generation module and the first floating voltage module, the outfan of described first floating voltage module connects the grid of described P-channel enhancement type MOSFET, described first bias voltage generation module and described first floating voltage wired in parallel；
The input of described second current source connects power supply, the outfan of described second current source connects the second bias voltage generation module and the second floating voltage module, the outfan of described second floating voltage module connects the grid of described N-channel enhancement mode MOSFET, described second bias voltage generation module and described second floating voltage wired in parallel.
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