CN105720932B - The power amplifier of adaptive supply voltage - Google Patents
The power amplifier of adaptive supply voltage Download PDFInfo
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- CN105720932B CN105720932B CN201410728085.5A CN201410728085A CN105720932B CN 105720932 B CN105720932 B CN 105720932B CN 201410728085 A CN201410728085 A CN 201410728085A CN 105720932 B CN105720932 B CN 105720932B
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Abstract
The present invention provides a kind of power amplifier of adaptive supply voltage, including：Voltage comparison module by the first supply voltage and each reference voltage in multiple reference voltages respectively compared with, obtain multiple comparative results, then current settings module determines output current value according to multiple comparative results, further, linear transconductance circuit module determines the gate voltage values of output level module, last output level module static working current value according to corresponding to exporting the gate voltage values according to output current value.Wherein, voltage comparison module can be worth to different comparative results according to the difference of supply voltage, so that current settings module can determine different output current values, the final different grid voltages for alloing linear transconductance circuit module to determine output stage according to different current values, so that output stage exports different static working current values, the scope of the supply voltage of the power amplifier effectively expanded.
Description
Technical field
The present invention relates to analog electronics technique, more particularly to a kind of power amplifier of adaptive supply voltage.
Background technology
Power line carrier communication is a kind of communication mode that carrier-wave transmission is carried out using this medium of power line.With net
The fast development of network technology and information technology, high speed of the domestic and international application low-voltage power line transmission rate in 1Mbps information
Power line carrier technology, as high speed power line carrier communication is constantly progressive, a power line simultaneous transmission can be passed through
Data, voice, video and electric power.Wherein, power amplifier plays very important effect in power-line carrier communication system.
In the power amplifiers, the grid voltage of power tube plays very important effect as a controllable parameter.Due to power network
Unstability, may be such that power network output brownout, if now power amplifier output-stage power pipe continue with
Current work under normal condition before, then bad influence can be caused to electronic device.
In the case of supply voltage is relatively low, in the market is used for the power amplifier of power line carrier link drive amplification all
A brownout threshold voltage and hysteresis voltage can be set, when supply voltage is less than brownout threshold voltage, by power amplifier
Power output pipe turns off, and just opens power tube until supply voltage returns to more than hysteresis voltage.
But by reducing the method being had undesirable effect to power amplifier in the prior art, when supply voltage is less than under-voltage
During threshold voltage, the power output pipe shut-off of power amplifier tube, namely now the restriction value of power amplifier output-stage electric current is
0%, and open power tube when supply voltage returns to more than hysteresis voltage, namely now power amplifier output-stage electric current
Restriction value be 100%, i.e., power amplification can be caused by reducing the method being had undesirable effect to power amplifier in the prior art
The output stage current value of device only exists 0% and 100% two kind of restriction value, so that the usable range of supply voltage is relatively
Small, limit power amplifier uses field.
The content of the invention
The embodiment of the present invention provides a kind of power amplifier of adaptive supply voltage, to overcome power of the prior art
The problem of APS amplifier power supply voltage usable range is small.
First aspect present invention provides a kind of power amplifier of adaptive supply voltage, including：
Voltage comparison module, for receiving the first supply voltage, by first supply voltage and multiple reference voltages
Each reference voltage be compared respectively, obtain multiple comparative results, and by the multiple comparative result export respectively to
Current settings module；
The current settings module, for receiving the multiple comparative result of the voltage comparison module output, according to
The multiple comparative result determines the output current value of the current settings module, and the output current value is exported to linear
Conduction-cross circuit module；
The linear transconductance circuit module, for receiving the output current value of the current settings module output, root
The input voltage value of the output level module is determined according to the output current value, and the input voltage value is exported to output stage
Module；
The output level module, for the input voltage value output pair determined according to the linear transconductance circuit module
The static working current value answered；
Operation transconductance amplifier, the input of the operation transconductance amplifier connect signal to be amplified, the output across
The output end for leading amplifier connects the input of the output level module.
In the first possible implementation of first aspect, the voltage comparison module includes multiple hysteresis voltage ratios
Compared with device；
Multiple hysteresis voltage comparators are connected in parallel, and the negative input end of each hysteresis voltage comparator connects respectively
A reference voltage in the multiple reference voltage is connect, the positive input terminal connection of each hysteresis voltage comparator described the
One supply voltage.
With reference to the first possible implementation of first aspect, in second of possible implementation of first aspect
In, the current settings module includes switch element and sum unit；
The switch element, for receiving the comparative result of each hysteresis voltage comparator output, and according to each
Current value corresponding to the comparative result to sum unit output；
The sum unit, for being summed to the corresponding current value of each switch element output, obtain defeated
Go out current value.
With reference to second of possible implementation of first aspect, in the third possible implementation of first aspect
In, the switch element includes multiple switch, each input of the switch and the output end of a hysteresis voltage comparator
Connection, the input of each switch are also connected with an input current, and the output end of each switch and the summation are single
Member connection；
If the comparative result of the hysteresis voltage comparator output is 0, described to switch off；
If the comparative result of hysteresis voltage comparator output is 1, the switch closure, with to the summation
Unit exports input current value corresponding with the switch.
In the 4th kind of possible implementation of first aspect, the output level module includes P-channel enhancement type metal
Oxide semiconductor field effect pipe MOSFET and the enhanced MOSFET of N-channel, the drain electrode of the P-channel enhancement type MOSFET and institute
State the enhanced MOSFET of N-channel drain electrode connection；
The linear transconductance circuit module is specifically used for：
The output current value determined according to the current settings module, determines MOSFET pairs of the P-channel enhancement type
Second grid voltage corresponding to the primary grid voltage and the enhanced MOSFET of the N-channel answered；
The second source voltage of the source electrode connection setting of the P-channel enhancement type MOSFET, the P-channel enhancement type
MOSFET is connected with the enhanced MOSFET of N-channel drain electrode, the source ground of the enhanced MOSFET of N-channel.
With reference to the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation of first aspect
In, the output end of the operation transconductance amplifier is with the P-channel enhancement type MOSFET's and enhanced MOSFET of the N-channel
Grid connects.
With reference to the 5th kind of possible implementation of first aspect, in the 6th kind of possible implementation of first aspect
In, in addition to：Output stage overcurrent protection module, for enhanced to the P-channel enhancement type MOSFET and the N-channel
MOSFET carries out overcurrent protection；
The input of the output stage overcurrent protection module strengthens with the P-channel enhancement type MOSFET and the N-channel
Type MOSFET drain electrode connection；
The output end of the output stage overcurrent protection module respectively with the P-channel enhancement type MOSFET and the N-channel
Enhanced MOSFET grid connection.
In the 4th kind of possible implementation with reference to first aspect, in the 7th kind of possible implementation of first aspect
In, the linear transconductance circuit module includes：
First current source, the second current source, the first bias voltage generation module, the second bias voltage generation module, first
Floating voltage module, the second floating voltage module, the first power supply and the second power supply；
The input connection power supply of first current source, the biasing of output end connection first of first current source
Voltage generating module and the first floating voltage module, the output end of the first floating voltage module connect the P-channel enhancing
Type MOSFET grid, the first bias voltage generation module and the first floating voltage wired in parallel；
The input connection power supply of second current source, the biasing of output end connection second of second current source
Voltage generating module and the second floating voltage module, the output end of the second floating voltage module connect the N-channel enhancing
Type MOSFET grid, the second bias voltage generation module and the second floating voltage wired in parallel.
The power amplifier of adaptive supply voltage in the present invention, including：Voltage comparison module, for receiving the first electricity
Source voltage, by first supply voltage and each reference voltage in multiple reference voltages respectively compared with, obtain more
Individual comparative result, and the multiple comparative result is exported to current settings module respectively；The current settings module, for connecing
The multiple comparative result of the voltage comparison module output is received, the current settings are determined according to the multiple comparative result
The output current value of module, and the output current value is exported to linear transconductance circuit module；The linear transconductance circuit mould
Block, for receiving the output current value of the current settings module output, determined according to the output current value described defeated
Go out the input voltage value of grade module, and the input voltage value is exported to output level module；The output level module, for root
Static working current value corresponding to the input voltage value output determined according to the linear transconductance circuit module；Operation transconductance is put
Big device, the input of the operation transconductance amplifier connect signal to be amplified, and the output end of the output transconductance amplifier connects
Connect the input of the output level module.
Wherein, voltage comparison module can be worth to different comparative results according to the difference of input supply voltage, so that
Different current values can be obtained by obtaining current settings module, finally make it that linear transconductance circuit module can according to different current values
To determine the different grid voltages of output stage, so that output stage exports different static working current values, effectively expand
The scope of the supply voltage of power amplifier, further expand the application of power amplifier.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the power amplifier of adaptive supply voltage provided in an embodiment of the present invention；
Fig. 2 is the concrete structure schematic diagram of voltage comparison module provided in an embodiment of the present invention；
Fig. 3 is the concrete structure schematic diagram of current settings module provided in an embodiment of the present invention；
Fig. 4 is the structure of the producing method of the input current of the input connection provided in an embodiment of the present invention each switched
Schematic diagram；
Fig. 5 is the concrete structure schematic diagram of linear transconductance circuit module provided in an embodiment of the present invention；
Fig. 6 is the concrete structure schematic diagram of output stage overcurrent protection module provided in an embodiment of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of the power amplifier of adaptive supply voltage provided in an embodiment of the present invention, such as Fig. 1 institutes
Show, the adaptive supply voltage power amplifier 100 can include：
Voltage comparison module 101, for receiving the first supply voltage, by first supply voltage and multiple reference voltages
In each reference voltage be compared respectively, obtain multiple comparative results, and the multiple comparative result is exported respectively
To current settings module 102.
Optionally, as shown in Fig. 2 voltage comparison module 101 can include multiple hysteresis voltage comparators 1011, and it is more
Individual hysteresis voltage comparator 1011 is connected in parallel, and according to the difference of practical application scene, can set multiple different reference electricity
Pressure, and the negative input end of each hysteresis voltage comparator 1011 connects a reference electricity in multiple reference voltages respectively
Pressure, specifically, the first supply voltage, which can pass through resistance R1 and resistance R2, carries out partial pressure, that is, each hysteresis voltage compares
Device 1011 positive input terminal connection be the first supply voltage partial pressure after magnitude of voltage, wherein, hysteresis voltage comparator 1011
Positive input terminal connection the first source voltage after
ValueWherein, VinFor the magnitude of voltage of the first supply voltage.
Wherein, it is in order to avoid on power line that the purpose with sluggish comparator is set in voltage comparison module 101
The influence of voltage dithering and noise and cause the switching of power tube between different states back and forth.
It should be noted that the difference of the reference voltage of the negative input end connection of two neighboring hysteresis voltage comparator 1011
It should be greater than the hysteresis voltage value of hysteresis voltage comparator 1011.
Optionally, for each in multiple hysteresis voltage comparators 1011, when the reference voltage of negative input end connection
More than the first supply voltage after the partial pressure of positive input terminal connection, the output end of the hysteresis voltage comparator 1011 exports low electricity
It is flat, that is, the output end output " 0 " of hysteresis voltage comparator 1011, when the reference voltage of negative input end connection is less than positive input
Hold the first supply voltage after the partial pressure of connection, the output end output high level of the hysteresis voltage comparator 1011, that is, late
The output end output " 1 " of stagnant voltage comparator 1011.
The current settings module 102, the multiple comparison knot exported for receiving the voltage comparison module 101
Fruit, determines the output current value of the current settings module 102 according to the multiple comparative result, and by the output current value
Export to linear transconductance circuit module 103.
Optionally, as shown in figure 3, the current settings module 102 can include switch element 1021 and sum unit
1022, the switch element 1021, including multiple switch, the ratio exported for receiving each hysteresis voltage comparator 1011
Relatively result, and corresponding current value is exported to the sum unit 1022 according to each comparative result；
The sum unit 1022, for asking the corresponding current value exported to each switch element 1021
With obtain output current value.
Specifically, the switch element 1021 includes multiple switch, the input of each switch and a sluggish electricity
The output end connection of comparator 1021 is pressed, the input of each switch is also connected with an input current, each switch
Output end be connected with the sum unit 1022；Wherein, input 1, input 2 ... input N be respectively corresponding to hysteresis voltage ratio
Compared with the output result of device 1011, electric current 1, electric current 2 ... electric current N is respectively that should be exported to summation after corresponding switch closes
The current value of unit 1022.
If the comparative result that the hysteresis voltage comparator 1011 exports is 1, the switch closure；If the ratio
Relatively result is 0, then described to switch off, and the corresponding current value of circuit corresponding to each switch, after closure is switched, this
Input current value corresponding to way switch is exported to sum unit 1022, so that the sum unit 1022 is according to the current value,
Try to achieve the current value that current settings module 102 should export.
In a kind of achievable mode of the present invention, the producing method of the input current of the input connection each switched
Can with as shown in figure 4, wherein, bias current can be produced by current biasing circuit, electric current 1, electric current 2 ... electric current N is passes through
The current value that current mirror obtains bias current according to certain scaled mirror, the ratio of its mirror image can be according to practical application field
Scape is adjusted, and the present invention is not any limitation as to it, further, the input that the present invention does not connect to the input of each switch
The producing method of electric current is any limitation as.
For example, having 3 hysteresis voltage comparators, respectively CMP1, CMP2 and CMP3 in voltage comparison module, then electric current is set
There are three switches, respectively S1, S2 and S3 in cover half block, wherein, S1 input connects with CMP1 output end, S2 input
End is connected with CMP2 output end, and S3 input is connected with CMP3 output end, and S1, S2 and S3 output end, which are connected to, to be asked
And unit, it is assumed that after S1, S2 and S3 closure, the current value that place circuit correspondingly flows through is 1 μ A, and CMP1 output is low electricity
Flat 0, CMP2 output is that the output of high level 1, CMP3 is high level 1, then can according to CMP1, CMP2 and CMP3 output result
Know, S1 disconnects, S2 and S3 closures, S2 and the circuit communication corresponding to S3, electric current flow to sum unit, and sum unit now determines
The output current of current settings module is the current value sum flowed through corresponding to circuit where S2 and S3, namely 2 μ A.
It is worth noting that, in actual applications, after each switch closure, each electricity for switching place circuit and correspondingly flowing through
Flow valuve can be different, and after the present invention is not to each switch closure, the size of the current value flowed through is any limitation as.
The linear transconductance circuit module 103, the output current exported for receiving the current settings module 102
Value, the input voltage value of the output level module 104 is determined according to the output current value, and the input voltage value is exported
To output level module 104.
The output level module 104, for the input voltage value determined according to the linear transconductance circuit module 103
Static working current value corresponding to output.
Optionally, as shown in Fig. 2 the output level module 104 includes P-channel enhancement type metal oxide semiconductcor field effect
Should manage (Metal-Oxide-Semiconductor Field-Effect Transistor, referred to as：MOSFET), it is simple below
Claim MP；N-channel enhanced MOSFET, hereinafter referred to as MN.The drain electrode of the MP connects with the drain electrode of the MN.
Optionally, the linear transconductance circuit module 103 is specifically used for：Determined according to the current settings module 102
The output current value, determine second grid voltage corresponding to primary grid voltage corresponding to the MP and the MN；
The second source voltage of the source electrode connection setting of the MP, the MP are connected with the drain electrode of the MN, the MN's
Source ground.
Specifically, it can be seen from the description above, when the output end of power amplifier does not connect load, MP electric current leads to
The drain electrode for crossing MP flows into MN drain electrode, then flows into ground by MN source electrode, that is, current value now is power amplifier
Static working current value.
Further, as shown in figure 5, the linear transconductance circuit module 103 can include：
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 of the first bias voltage generation module 1031a connects linear conduction-cross circuit module power supply 1034, institute
The input for stating the first current source 1033a connects the first bias voltage generation module 1031a output end and the first floating voltage
Module 1032a input, the output head grounding of the first current source 1033a, the first floating voltage module 1032a's
The MP of output end connection output level module 104 grid；
The input of the second current source 1033b connects linear conduction-cross circuit module power supply 1034, second electric current
Source 1033b output end connects the second bias voltage generation module 1031b input and the second floating voltage module 1032b
Input, the MN of the output end connection output level module 104 of the second floating voltage module 1032b grid.
Wherein, the current value that the first current source 1033a and the second current source 1033b are set is true as current settings module 102
Fixed output current value.
For example, the output current value set when current settings module is 2 μ A, then now 2 μ A current value flow into linearly across
Conductive path module, 2 μ A current value corresponds to the first biased electrical in linear transconductance circuit module in linear conduction-cross circuit module
Press bias voltage V caused by generation module and the second bias voltage generation moduleBIAS1And VBIAS2It is 2V, the first floating voltage
The voltage VF1 of module is 1.4V and the voltage of the second floating voltage module is that VF2 is 0.5V, linear transconductance circuit module power supply
Voltage VDD1 and VDD2 are respectively 12V, then grid voltage corresponding to MN is VBIAS1Corresponding to grid corresponding to-VF1=0.6V, MP
Magnitude of voltage is VDD-VBIAS2+ VF2=10.5V.
It is worth noting that, the circuit structure of the structural representation of modules involved in the embodiment of the present invention, can
To change circuit components therein or increase circuit components therein according to the demand of reality, as long as it can reach this hair
Output result in inventive embodiments required for modules.
Operation transconductance amplifier 105, the input of the operation transconductance amplifier 105 connects signal to be amplified, described
The output end of operation transconductance amplifier 106 connects the input of the output level module 104.
Optionally, the output end of the operation transconductance amplifier 105 is connected with the MP and the MN grid.
In the application of reality, the input of the anterior operation transconductance amplifier 105 of output level module 104, which can connect, to be waited to put
Big signal so that the signal to be amplified after the output end output processing of output level module 104, that is, after output amplification
Signal.
Specifically, the operation transconductance amplifier 105 and output level module 104 form the power with two level enlarging function
The signal to be amplified of input can be carried out anti-phase amplification by amplifier, first operation transconductance amplifier 105, then by anti-phase amplification
Signal afterwards is inputted to output level module 104 and carries out secondary amplification, and output level module 104 is carried out instead again to the signal after amplification
Mutually amplify, now can output and the signal after signal phase identical amplification to be amplified.
Further, as shown in figure 1, the work(power amplifier 100 of the adaptive supply voltage also includes：Output stage electricity
Protection module 106 is flowed, for carrying out overcurrent protection to the MP and MN.
Specifically, the input of the output stage overcurrent protection module 106 is connected with the MP and the MN drain electrode, institute
Grid of the output end of output stage overcurrent protection module 106 respectively with the MP and the MN is stated to be connected.
Further, as shown in fig. 6, the output stage overcurrent protection module 106 specifically includes：Power tube current sampling electricity
Stream 1061, power tube maximum current initialization circuit 1062 and control circuit 1063, wherein power tube sample circuit 1061 is to power
The sample mode of the actual output current of pipe can be：By being sampled to the voltage that power tube drains, power can be learnt
The actual output current value I of pipeIt is actual, and power tube maximum current initialization circuit 1062 is used to determine power tube in normal work shape
Exportable maximum current value I under statemax, control circuit 1063 is for comparing IIt is actualWith ImaxMagnitude relationship, and closed according to size
The working method of the grid of system's control power tube, works as IIt is actualMore than ImaxWhen, control circuit 1063 turns off power tube, that is,
The grid voltage of MN pipes is pulled to low level, the grid voltage of MP pipes is pulled to high level, and works as IIt is actualLess than ImaxWhen, control electricity
Any processing is not done to power tube in road 1063.
Specifically, assume in the prior art, when the magnitude of voltage after source voltage is less than 1.154V, power amplification
Device output stage is automatically shut down；When the magnitude of voltage after source voltage is more than 1.154V+Vsys, power amplifier output-stage is led
Logical (wherein Vsys is hysteresis voltage).For above-mentioned power amplifier of the prior art, the embodiments of the invention provide one kind
Specific embodiment, the use range of the supply voltage for expanding above-mentioned prior art intermediate power amplifier, the present embodiment
4 hysteresis voltage comparators of middle setting, respectively CMP1, CMP2, CMP3 and CMP4, and 4 different reference voltages are set, with
Lower reference voltage is represented with Vref, specifically, 4 set in the present embodiment reference voltage is respectively Vref1, Vref2,
Vref3 and Vref4, CMP1 negative input end connect Vref1, and CMP2 negative input end connection Vref2, CMP3 negative input end connect
Meeting Vref3, CMP4 negative input end connection Vref4, it is assumed that the hysteresis voltage of hysteresis voltage comparator is 20mV, and adjacent two
The difference of the reference voltage of individual hysteresis voltage comparator negative input end connection is 64mV, i.e. Vref1=0.962V, Vref2=
1.026V, Vref3=1.090V, Vref4=1.154V, when the supply voltage point that the positive input terminal of hysteresis voltage comparator connects
Value after pressure is 1.054V, and now the value 1.054V after source voltage is less than 1.154V, will directly close in the prior art
Disconnected power amplifier output-stage, power amplifier is stopped, and the power amplification of adaptive supply voltage provided by the invention
Device, value after source voltage is 1.054V, and power amplifier still works, and without turning off, is specially：
For CMP1, the reference voltage level of negative input end connection be 0.962V, the supply voltage that positive input terminal connects
Value after partial pressure is 1.054V, and the reference voltage level 0.962V of negative input end connection is less than the supply voltage of positive input terminal connection
Value 1.054V after partial pressure, then CMP1 output end output high level, namely output " 1 "；For CMP2, negative input end connects
The reference voltage level connect is 1.026V, and the value after the source voltage of positive input terminal connection be 1.054V, and negative input end company
Output ends of the reference voltage level 1.026V connect less than value 1.054V, then CMP2 after the source voltage of positive input terminal connection
High level, namely output " 1 " are exported, CMP3 and CMP4 are similar with CMP1 and CMP2 comparison, do not repeat one by one herein, then,
CMP3 output end output low level, namely output " 0 ", CMP4 output end output low level, namely output " 0 ", electric current is set
Switch closure corresponding with CMP1, switch corresponding with CMP2 are closed, corresponding with CMP3 switched off and CMP4 in cover half block
It is corresponding to switch off, it is assumed that after switch closure corresponding to CMP1, the current value that circuit where this switch passes through is I1=10 μ A,
After switch closure corresponding to CMP2, the current value that circuit where this switch passes through is I2=10 μ A, then current settings module is defeated
It is I to go out current value1And I2Sum, i.e. 20 μ A, then this current value is inputted to linear transconductance circuit module, linear transconductance circuit
Module determined according to the current value of input input voltage value corresponding to the grid of the MP and MN in output level module for 10.5V and
0.6V, and now the static working current value of output level module is 50 μ A.It can be seen from above-mentioned analysis, when being divided to the work(
When the supply voltage of rate amplifier is less than 1.154V, power amplifier provided by the invention still can be this with normal use
When the current value that exports be less than current value when the supply voltage for being divided to the power amplifier is 1.154V.
The embodiment of the present invention provides a kind of power amplifier of adaptive supply voltage, including：Voltage comparison module, it is used for
The first supply voltage is received, first supply voltage and each reference voltage in multiple reference voltages are compared respectively
Compared with obtaining multiple comparative results, and the multiple comparative result is exported to current settings module respectively；The current settings mould
Block, for receiving the multiple comparative result of the voltage comparison module output, institute is determined according to the multiple comparative result
The output current value of current settings module is stated, and the output current value is exported to linear transconductance circuit module；It is described linear
Conduction-cross circuit module, for receiving the output current value of the current settings module output, according to the output current value
The input voltage value of the output level module is determined, and the input voltage value is exported to output level module；The output stage
Module, for determined according to the linear transconductance circuit module the input voltage value output corresponding to static working current
Value；Operation transconductance amplifier, the input of the operation transconductance amplifier connect signal to be amplified, the output mutual conductance amplification
The output end of device connects the input of the output level module.
Wherein, voltage comparison module can be worth to different comparative results according to the difference of input supply voltage, so that
Different current values can be obtained by obtaining current settings module, finally make it that linear transconductance circuit module can according to different current values
To determine the different grid voltages of output stage, so that output stage exports different static working current values, effectively expand
The scope of the supply voltage of power amplifier, further expand the application of power amplifier.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
- A kind of 1. power amplifier of adaptive supply voltage, it is characterised in that including：Voltage comparison module, for receiving the first supply voltage, by first supply voltage with it is every in multiple reference voltages One reference voltage is compared respectively, obtains multiple comparative results, and the multiple comparative result is exported to electric current respectively Setting module；The current settings module, for receiving the multiple comparative result of the voltage comparison module output, according to described Multiple comparative results determine the output current value of the current settings module, and the output current value is exported to linear transconductance Circuit module；The linear transconductance circuit module, for receiving the output current value of the current settings module output, according to institute The input voltage value that output current value determines output level module is stated, and the input voltage value is exported to output level module；The output level module, for determined according to the linear transconductance circuit module the input voltage value output corresponding to Static working current value；Operation transconductance amplifier, the input of the operation transconductance amplifier connect signal to be amplified, and the operation transconductance is put The output end of big device connects the input of the output level module.
- 2. the power amplifier of adaptive supply voltage according to claim 1, it is characterised in that the voltage ratio is compared with mould Block includes multiple hysteresis voltage comparators；Multiple hysteresis voltage comparators are connected in parallel, and the negative input end of each hysteresis voltage comparator connects institute respectively A reference voltage in multiple reference voltages is stated, positive input terminal connection first electricity of each hysteresis voltage comparator Source voltage.
- 3. the power amplifier of adaptive supply voltage according to claim 2, it is characterised in that the current settings mould Block includes switch element and sum unit；The switch element, for receiving the comparative result of each hysteresis voltage comparator output, and according to each described Current value corresponding to comparative result to sum unit output；The sum unit, for being summed to the corresponding current value of each switch element output, obtain output electricity Flow valuve.
- 4. the power amplifier of adaptive supply voltage according to claim 3, it is characterised in that the switch element bag Multiple switch is included, the input of each switch is connected with the output end of a hysteresis voltage comparator, each switch Input be also connected with an input current, the output end of each switch is connected with the sum unit；If the comparative result of the hysteresis voltage comparator output is 0, described to switch off；If the comparative result of hysteresis voltage comparator output is 1, the switch closure, with to the sum unit Output input current value corresponding with the switch.
- 5. the power amplifier of adaptive supply voltage according to claim 1, it is characterised in that the output level module Including P-channel enhancement type metal oxide semiconductor field effect tube MOSFET and the enhanced MOSFET of N-channel, the P-channel increases Strong type MOSFET drain electrode connects with the enhanced MOSFET of N-channel drain electrode；The linear transconductance circuit module is specifically used for：The output current value determined according to the current settings module, is determined corresponding to the P-channel enhancement type MOSFET Second grid voltage corresponding to primary grid voltage and the enhanced MOSFET of the N-channel；The P-channel enhancement type MOSFET source electrode connection setting second source voltage, the P-channel enhancement type MOSFET with The drain electrode connection of the enhanced MOSFET of N-channel, the source ground of the enhanced MOSFET of N-channel.
- 6. the power amplifier of adaptive supply voltage according to claim 5, it is characterised in that the operation transconductance is put The output end of big device is connected with the P-channel enhancement type MOSFET and the enhanced MOSFET of the N-channel grid.
- 7. the power amplifier of adaptive supply voltage according to claim 5, it is characterised in that also include：Output stage Overcurrent protection module, for carrying out overcurrent protection to the P-channel enhancement type MOSFET and the enhanced MOSFET of the N-channel；The input of the output stage overcurrent protection module and the P-channel enhancement type MOSFET and the N-channel are enhanced MOSFET drain electrode connection；The output end of the output stage overcurrent protection module strengthens with the P-channel enhancement type MOSFET and the N-channel respectively Type MOSFET grid connection.
- 8. the power amplifier of adaptive supply voltage according to claim 5, it is characterised in that the linear transconductance electricity Road module includes：First current source, the second current source, the first bias voltage generation module, the second bias voltage generation module, first float Voltage module, the second floating voltage module, the first power supply and the second power supply；The input connection power supply of first current source, the output end of first current source connect the first bias voltage Generation module and the first floating voltage module, the output end of the first floating voltage module connect the P-channel enhancement type MOSFET grid, the first bias voltage generation module and the first floating voltage wired in parallel；The input connection power supply of second current source, the output end of second current source connect the second bias voltage Generation module and the second floating voltage module, the output end connection N-channel of the second floating voltage module are enhanced MOSFET grid, the second bias voltage generation module and the second floating voltage wired in parallel.
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| CN109412411B (en) * | 2018-10-12 | 2020-09-01 | 嘉兴禾润电子科技有限公司 | Boost chip with self-adaptive multi-section boosting and automatic current-limiting protection functions |
| CN111812575B (en) * | 2020-07-20 | 2023-07-21 | 广东电网有限责任公司电力调度控制中心 | Equivalent simulation method for small-range current transformer |
| CN112631366A (en) * | 2020-11-26 | 2021-04-09 | 玄武石半导体(武汉)有限公司 | Control circuit and control method for continuous piecewise linear current |
| CN114204925B (en) * | 2021-11-25 | 2024-01-09 | 苏州浪潮智能科技有限公司 | Current control method and device for MOSFET (Metal-oxide-semiconductor field Effect transistor) component |
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| CN103546103A (en) * | 2012-07-11 | 2014-01-29 | 联发科技股份有限公司 | Amplifier circuit |
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| JP3359248B2 (en) * | 1996-11-28 | 2002-12-24 | 株式会社ケンウッド | Output power limiting circuit of power amplifier |
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| CN101893908A (en) * | 2010-07-08 | 2010-11-24 | 西安启芯微电子有限公司 | Filling in/pulling out current rapid response linear voltage regulator and regulating method |
| CN202632149U (en) * | 2012-04-28 | 2012-12-26 | 上海海尔集成电路有限公司 | Device for converting voltage signal |
| CN103546103A (en) * | 2012-07-11 | 2014-01-29 | 联发科技股份有限公司 | Amplifier circuit |
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