CN107846199A - Binary channels power amplifier - Google Patents
Binary channels power amplifier Download PDFInfo
- Publication number
- CN107846199A CN107846199A CN201610836324.8A CN201610836324A CN107846199A CN 107846199 A CN107846199 A CN 107846199A CN 201610836324 A CN201610836324 A CN 201610836324A CN 107846199 A CN107846199 A CN 107846199A
- Authority
- CN
- China
- Prior art keywords
- voltage
- level
- lead
- input
- out terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45928—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit
Abstract
The embodiments of the invention provide a kind of binary channels power amplifier, it includes：First passage includes first input end, the first input buffer stage, first phase adjustment level, first voltage amplifying stage, the first current expansion level and first lead-out terminal；Second channel includes the second input terminal, the second input buffer stage, second phase adjustment level, second voltage amplifying stage, the second current expansion level and the second lead-out terminal；The output end of two inputs connection the first input buffer stage and the output end of the second input buffer stage of selecting switch, the input of its output end connection second phase adjustment level, for selecting the first input buffer stage or the second input buffer stage to adjust level input signal for second phase, when selecting the first input buffer stage to adjust level input signal for second phase, the opposite in phase of first passage and second channel signal, the amplitude of the voltage exported between the second lead-out terminal and first lead-out terminal are twice that each lead-out terminal individually exports voltage-to-ground amplitude.
Description
Technical field
The present invention relates to power amplifier techniques field, more particularly to a kind of binary channels power amplifier.
Background technology
General purpose function waveform generator and random waveform signal source output stage are restricted, do not reach needs in a test system
Voltage and power.Power amplifier has amplification voltage, extension electric current, the function of amplifying power.For testing audio equipment,
The application scenarios such as magnetic material, pressure cell, photoelectric material are, it is necessary to higher power and larger bandwidth.For above-mentioned application
Occasion, add power amplifier in signal source output, to meet test condition.
Power amplifier is generally made up of on circuit structure multistage, as shown in figure 1, being put comprising input buffer stage, voltage
Big level, phase adjustment level, pre-add bias voltage, current expansion output stage etc. are formed.Existing power amplifier is usually single channel
Amplifier or two-path amplifier.Power amplifier circuit structure as shown in Figure 1, can save pre-add bias voltage and phase
The part of adjustment, voltage amplification and current expansion two parts can also be merged.
Existing power amplifier output voltage amplitude is limited by supply voltage, it is impossible to is applied to the field of High voltage output
Close.Because output voltage is relatively low, while power output is limited, and for measurement high-power audio equipment, high pressure magnetic material
Deng application scenario, it is necessary to which sufficiently large voltage amplitude, therefore, control output large amplitude are very necessary.
The content of the invention
The embodiments of the invention provide a kind of binary channels power amplifier, to solve to export measurement in the prior art greatly
The technical problem for the big voltage amplitude that the application scenarios such as power stereo set, high pressure magnetic material need.The binary channels power is put
Big device includes：First passage, successively including first input end, the first input buffer stage, first phase adjustment level, first voltage
Amplifying stage, the first current expansion level and first lead-out terminal, for carrying out voltage amplification and power amplification to input signal；The
Two passages, successively including the second input terminal, the second input buffer stage, second phase adjustment level, second voltage amplifying stage, second
Current expansion level and the second lead-out terminal, for carrying out voltage amplification and power amplification to input signal；Selecting switch, it is described
The output end and described second that two inputs of selecting switch connect the first input buffer stage respectively inputs buffer stage
Output end, the output end of the selecting switch connect the input of the second phase adjustment level, described first defeated for selecting
It is that the second phase adjusts level input signal to enter buffer stage or the second input buffer stage, and selecting, second input is slow
When rushing level and adjusting level input signal for the second phase, second phase adjustment level and first phase adjustment level docking
The signal of receipts does not do phase and reversely adjusted, and second lead-out terminal and the first lead-out terminal individually export electricity over the ground
Pressure；When selecting the first input buffer stage to adjust level input signal for the second phase, the second phase adjusts level
Receive the signal of the first input buffer stage input simultaneously with first phase adjustment level, second phase adjustment level or
The first phase adjustment level is done phase to the signal of reception and reversely adjusted, second lead-out terminal and first output end
The amplitude of the voltage exported between son is twice that each lead-out terminal individually exports voltage-to-ground amplitude.
In one embodiment, in addition to：Circuit is calibrated, the first end of the calibration circuit exports with described first respectively
Terminal connects with second lead-out terminal, the second end input with the first voltage amplifying stage respectively of the calibration circuit
End connects with the input of the second voltage amplifying stage, for gathering the first lead-out terminal and second output respectively
The DC voltage data of terminal, the first voltage is added according to the DC voltage data point reuse of the first lead-out terminal and amplified
The bias voltage of level；The inclined of the second voltage amplifying stage is added according to the DC voltage data point reuse of second lead-out terminal
Put voltage.
In one embodiment, the calibration circuit, including：Two ADC analog-digital converters, exported respectively with described first
Terminal connects with second lead-out terminal, for gathering the straight of the first lead-out terminal and second lead-out terminal respectively
Flow voltage data；MCU(Microcontroller Unit；Micro-control unit), it is connected with two ADC, for receiving two
The DC voltage data of individual ADC feedback, adjustment described the is sent according to the DC voltage data of the first lead-out terminal
First signal of the bias voltage of one voltage amplifier stage；Adjustment institute is sent according to the DC voltage data of second lead-out terminal
State the secondary signal of the bias voltage of second voltage amplifying stage；Two voltage adjusting devices, are connected with MCU, two voltage adjustment
A voltage adjusting device in equipment is connected with the input of the first voltage amplifying stage, another voltage adjusting device with
The input connection of the second voltage amplifying stage, one voltage adjusting device are used to adjust institute according to first signal
State the size of the bias voltage of first voltage amplifying stage；Another described voltage adjusting device is used to be adjusted according to the secondary signal
The size of the bias voltage of the whole second voltage amplifying stage.
In one embodiment, the voltage adjusting device is digital regulation resistance.
In one embodiment, the voltage adjusting device is DAC digital analog converters.
In one embodiment, the voltage adjusting device is constant-current source.
In one embodiment, in addition to：Two overcurrent protection modules, be separately mounted to the first current expansion level and
In the second current expansion level, for detecting the output of the first current expansion level and the second current expansion level respectively
Electric current, when the output current for detecting the first current expansion level is more than pre-set current value, reduces by first electric current and expand
Open up the output current of level；When the output current for detecting the second current expansion level is more than the pre-set current value, reduce
The output current of the second current expansion level.
In one embodiment, the first input buffer stage and the second input buffer stage are AD8066 models
Operational amplifier.
In one embodiment, the first voltage amplifying stage and the second voltage amplifying stage are AD8009 models
Operational amplifier.
In embodiments of the present invention, by setting selecting switch between first passage and second channel, to select first
It is that second phase adjusts level input signal to input buffer stage or the second input buffer stage, in selecting switch selection the second input buffering
When level adjusts level input signal for second phase, the signal of second phase adjustment level reception the second input buffer stage input, first
Phase adjustment level receives the signal of the first input buffer stage input, and first phase adjustment level and second phase adjust level to reception
Signal does not do phase and reversely adjusted, i.e. first passage and second channel individually exports voltage-to-ground, realizes binary channels list
End pattern；When the input buffer stage of selecting switch selection first adjusts level input signal for second phase, second phase adjustment level
Receive the signal of the first input buffer stage input, second phase adjustment level or first phase adjustment simultaneously with first phase adjustment level
Level is done phase to the signal of reception and reversely adjusted, i.e., first passage and the voltage-phase in second channel are opposite, amplitude is identical, real
Existing single channel difference modes, the amplitude of the voltage now exported between the second lead-out terminal and first lead-out terminal is each output
Terminal individually exports twice of voltage-to-ground amplitude, realizes in the case where not changing signal source output signal, expands double
The amplitude of channel power amplifier output voltage, be advantageous to meet the applications such as test high-power audio equipment, high pressure magnetic material
Occasion needs the demand of sufficiently large voltage amplitude.Meanwhile the use of selecting switch, binary channels power amplifier can be in single channels
Free switching between difference modes and binary channels single-ended mode, meet different voltage amplitude demands, be advantageous to extend binary channels
The application of power amplifier.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, not
Form limitation of the invention.In the accompanying drawings：
Fig. 1 is a kind of circuit structure diagram of power amplifier of the prior art；
Fig. 2 is a kind of circuit structure diagram of binary channels power amplifier provided in an embodiment of the present invention；
Fig. 3 is a kind of binary channels power amplifier each passage under binary channels single-ended mode provided in an embodiment of the present invention
The schematic diagram of output signal；
Fig. 4 is a kind of signal stream of the binary channels power amplifier provided in an embodiment of the present invention under single channel difference modes
To schematic diagram；
Fig. 5 is that a kind of binary channels power amplifier two passages under single channel difference modes provided in an embodiment of the present invention are each
From the schematic diagram of output signal；
Fig. 6 is a kind of binary channels power amplifier provided in an embodiment of the present invention in single channel difference modes and binary channels list
The contrast schematic diagram of output signal under the pattern of end；
Fig. 7 is a kind of circuit structure diagram of specific binary channels power amplifier provided in an embodiment of the present invention；
Fig. 8 is a kind of circuit diagram of specific binary channels power amplifier provided in an embodiment of the present invention.
Embodiment
It is right with reference to embodiment and accompanying drawing for the object, technical solutions and advantages of the present invention are more clearly understood
The present invention is described in further details.Here, the exemplary embodiment of the present invention and its illustrate to be used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
In embodiments of the present invention, there is provided a kind of binary channels power amplifier, as shown in Fig. 2 the binary channels power is put
Big device includes：
First passage 201, input buffer stage 2012, first phase adjustment including first input end 2011, first successively
Level 2013, first voltage amplifying stage 2014, the first current expansion level 2015 and first lead-out terminal 2016, for believing input
Number carry out voltage amplification and power amplification；
Second channel 202, successively including the second input terminal 2021, second input buffer stage 2022, second phase adjustment
Level 2023, second voltage amplifying stage 2024, the second current expansion level 2025 and the second lead-out terminal 2026, for believing input
Number carry out voltage amplification and power amplification；
Selecting switch 203, two inputs of the selecting switch connect the output of the first input buffer stage respectively
End and the output end of the described second input buffer stage, the output end of the selecting switch connect the defeated of the second phase adjustment level
Enter end, for selecting the first input buffer stage or the second input buffer stage to adjust level input letter for the second phase
Number, when selecting the second input buffer stage to adjust level input signal for the second phase, the second phase adjusts level
Phase is not done to the signal of reception reversely adjusted with first phase adjustment level, second lead-out terminal and described first defeated
Go out terminal and individually export voltage-to-ground；Selecting the first input buffer stage level input letter is adjusted for the second phase
Number when, second phase adjustment level and first phase adjustment level receive the letter of the first input buffer stage input simultaneously
Number, the second phase adjustment level or first phase adjustment level are done phase to the signal of reception and reversely adjusted, and described second
The amplitude of the voltage exported between lead-out terminal and the first lead-out terminal is that each lead-out terminal individually exports voltage-to-ground
Twice of amplitude.
Understand as shown in Figure 1, in embodiments of the present invention, by setting selection to open between first passage and second channel
Close, to select the first input buffer stage or the second input buffer stage to adjust level input signal for second phase, selected in selecting switch
Select the second input buffer stage for second phase adjust level input signal when, second phase adjustment level receive second input buffer stage it is defeated
The signal entered, first phase adjustment level receive the signal of the first input buffer stage input, first phase adjustment level and second phase
Adjustment level is not done phase to the signal of reception and reversely adjusted, i.e., first passage and second channel individually export electric over the ground
Pressure, realizes binary channels single-ended mode；When the input buffer stage of selecting switch selection first adjusts level input signal for second phase,
Second phase adjusts level and first phase adjustment level receives the signal of the first input buffer stage input, second phase adjustment level simultaneously
Or first phase adjustment level is done phase to the signal of reception and reversely adjusted, i.e., the voltage-phase phase in first passage and second channel
Instead, amplitude is identical, realizes single channel difference modes, the voltage now exported between the second lead-out terminal and first lead-out terminal
Amplitude is twice that each lead-out terminal individually exports voltage-to-ground amplitude, realizes and is not changing the feelings of signal source output signal
Under condition, the amplitude of binary channels power amplifier output voltage is expanded, is advantageous to meet test high-power audio equipment, high pressure magnetic
Property the application scenario such as material need the demand of sufficiently large voltage amplitude.Meanwhile the use of selecting switch, binary channels power amplifier
Can between single channel difference modes and binary channels single-ended mode free switching, meet different voltage amplitude demands, favorably
In the application of extension binary channels power amplifier.
When it is implemented, using for selecting switch 203 allows binary channels power amplifier in single channel difference modes
The free switching between binary channels single-ended mode, specifically, under binary channels single-ended mode, the input of selecting switch selection second is slow
Rush level 2022 and adjust the input signal of level 2023 for second phase, now second phase adjustment level 2023 receives the second input buffer stage
The signal of 2022 inputs, first phase adjustment level 2013 receive the signal that the first input buffer stage 2012 inputs, and first phase is adjusted
The signal of whole level 2013 and second phase adjustment 2023 pairs of receptions of level does not do phase and reversely adjusted, i.e., first passage and second leads to
Road individually exports voltage-to-ground, and second phase adjustment level 2023 and first phase adjustment 2013 pairs of signals received of level are not done
Phase reversely adjusts, respectively after the voltage amplification and power amplification of first passage and second channel, as shown in figure 3, the
Two lead-out terminals 2026 and first lead-out terminal 2016 individually export voltage-to-ground, and the output signal in Fig. 3 represents second
The voltage-to-ground waveform that lead-out terminal 2026 or first lead-out terminal 2016 individually export, input signal are the second inputs
The signal waveform that son 2021 or first input end 2011 input, it is seen then that simply amplitude expands output signal compared with input signal
Greatly, phase does not change.
Specifically, as shown in figure 4, under single channel difference modes, the selection of selecting switch 203 first inputs buffer stage 2012
The input signal of level 2023 is adjusted for second phase, second phase adjustment level 2023 and first phase adjustment level 2013 receive the simultaneously
One inputs the signal that buffer stage 2012 inputs, and now the second input buffer stage 2022 does not work, second phase adjustment level 2023
Or the signal of first phase adjustment 2013 pairs of receptions of level does phase and reversely adjusted so that the voltage in first passage and second channel
Signal phase 180 degree is opposite, amplitude is identical, respectively by first passage and second channel voltage amplification and power amplification it
Afterwards, the amplitude of the voltage exported between the second lead-out terminal 2026 and first lead-out terminal 2016 is that each lead-out terminal is individually defeated
Go out twice of voltage-to-ground amplitude.Specifically, as shown in figure 5, input signal is input to first passage by the first input buffer stage
After the phase adjustment level of second channel, to do phase to the signal of reception reverse for first phase adjustment level or second phase adjustment level
Adjustment, for example, so that second phase adjustment level does the reverse adjustment of phase to the signal of reception as an example, output signal 1 is first in Fig. 5
The signal waveform of passage output, the output signal 2 in Fig. 5 are the signal waveform of second channel output, it is seen then that first passage and the
The signal waveform of one passage output is compared, and phase 180 degree is on the contrary, amplitude is identical, as shown in fig. 6, the lead-out terminal of first passage
Signal output waveform between the lead-out terminal of second channel as shown in the difference output in Fig. 6, with output believe by difference output
Number 1 compares, and amplitude expands twice.
When it is implemented, high-power high-frequency equipment DC performance is low, show that bias voltage is big, i.e., it is defeated when input is 0V
It is not 0V to go out, and because the individual difference of device makes deviation larger, is tested for accurate device, it is impossible to meets to require.In addition, power
Amplifier belongs to high-power instrument, and its power output and dissipated power are very big, and instrument has very big temperature rise, because device has
Certain temperature characterisitic, output bias voltage can be caused further to increase, deteriorate output DC characteristic.And in the prior art, pass
Transformer power amplifier calibration of uniting manually adjusts potentiometer or changes resistance and completes, and also has part not calibrate, makes
Obtain gain or DC voltage deviation is larger.In the present embodiment, it is above-mentioned double in order to realize the self calibration of binary channels power amplifier
Channel power amplifier, in addition to：Calibrate circuit, it is described calibration circuit first end respectively with the first lead-out terminal and institute
State the connection of the second lead-out terminal, the second end of the calibration circuit respectively with the input of the first voltage amplifying stage and described
The input connection of second voltage amplifying stage, for gathering the straight of the first lead-out terminal and second lead-out terminal respectively
Voltage data is flowed, the biasing of the first voltage amplifying stage is added according to the DC voltage data point reuse of the first lead-out terminal
Voltage；The bias voltage of the second voltage amplifying stage is added according to the DC voltage data point reuse of second lead-out terminal.
Specifically, the use of calibration circuit can reduce DC offset voltage.Also, when power amplifier is in different temperature
In use, self calibration can be done after temperature plateau under degree environment, the Dc bias come due to temperature band is eliminated.
When it is implemented, as shown in fig. 7, by taking first passage as an example, calibration circuit described above, including：Two ADC moduluses
Converter 701, it is connected respectively with the first lead-out terminal and second lead-out terminal, it is defeated for gathering described first respectively
Go out the DC voltage data of terminal and second lead-out terminal；MCU micro-control units 702, it is connected, uses with two ADC
In the DC voltage data for receiving two ADC feedbacks, tune is sent according to the DC voltage data of the first lead-out terminal
First signal of the bias voltage of the whole first voltage amplifying stage；Sent out according to the DC voltage data of second lead-out terminal
Go out the secondary signal for the bias voltage for adjusting the second voltage amplifying stage；Two voltage adjusting devices 703, with MCU microcontrollers
Unit connects, and a voltage adjusting device in two voltage adjusting devices and the input of the first voltage amplifying stage connect
Connect, another voltage adjusting device is connected with the input of the second voltage amplifying stage, and one voltage adjusting device is used
In the size for the bias voltage that the first voltage amplifying stage is adjusted according to first signal；Another voltage adjustment is set
It is ready for use on the size for the bias voltage that the second voltage amplifying stage is adjusted according to the secondary signal.
Specifically, when input signal short circuit, MCU 702 sets the value of voltage adjusting device 703, and adjustment is added in voltage amplification
The size of the bias voltage of level, gather DC voltage in lead-out terminal part using ADC 701 and feed back to MCU, MCU roots again
According to the value of the DC voltage adjustment voltage adjusting device 703 of collection, until the DC voltage value that ADC 701 is collected is minimum.Can
To reduce due to DC offset problem caused by device individual difference., can when using the variation of ambient temperature of power amplifier
To do above-mentioned calibration operation again, eliminate temperature band and carry out DC deviation.
When it is implemented, above-mentioned voltage adjusting device 703 can be digital regulation resistance, DAC digital analog converters or constant-current source.
MCU realizes the size of the bias voltage of adjustment voltage amplifier stage by adjusting the resistance value of digital regulation resistance；MCU passes through adjustment
DAC electric current or resistance value realize the size of the bias voltage of adjustment voltage amplifier stage.
When it is implemented, in order to further improve the performance of power amplifier, in the present embodiment, above-mentioned power amplifier
Also include：Two overcurrent protection modules, it is separately mounted in the first current expansion level and the second current expansion level, uses
In the output current for detecting the first current expansion level and the second current expansion level respectively, first electricity is being detected
When the output current of stream extension level is more than pre-set current value, the output current of the first current expansion level is reduced；Detecting
When the output current of the second current expansion level is more than the pre-set current value, the output of the second current expansion level is reduced
Electric current.Specifically, the application is not limited the concrete structure of overcurrent protection module, excessively stream of the prior art can be used to protect
Module is protected, for example, the function of overcurrent protection module can be realized by resistance and current sensing device.
When it is implemented, in order to improve the calculating performance of power amplifier, in the present embodiment, the first input buffering
Level and the described second input buffer stage can be the operational amplifier of AD8066 models；The first voltage amplifying stage and described
Second voltage amplifying stage can be the operational amplifier of AD8009 models.
The course of work of above-mentioned binary channels power amplifier is described in detail below in conjunction with specific example.It is for example, above-mentioned double
The circuit of channel power amplifier by taking circuit shown in Fig. 8 as an example, wherein, relay RL1 realizes the function of first input end, fortune
The function that amplifier U3A realizes the first input buffer stage is calculated, relay RL2 realizes the function of first phase adjustment level, and computing is put
Big device U4 realizes the function of first voltage amplifying stage, and operational amplifier U5 realizes the function of the first current expansion level, relay RL3
The function of first lead-out terminal is realized, relay RL5 realizes the function of the second input terminal, and operational amplifier U3B realizes second
The function of buffer stage is inputted, relay RL4 realizes the function of selecting switch, and relay RL6 realizes the work(of second phase adjustment level
Can, operational amplifier U6 realizes the function of second voltage amplifying stage, and operational amplifier U7 realizes the function of the second current expansion level,
Relay RL7 realizes the function of the second lead-out terminal, and ADC does control process as voltage detecting, MCU, is represented using R12, R22
Digital regulation resistance.
First passage, by RL1 input signals, by U3A, RL2, U4, U5, RL3, is exported by signal source J4 in J3.U3A
As the buffering of signal, RL2 switchings by U4 signal phase can be made positive or anti-phase, U5 power-amplifier stages, RL3 controls are believed
Number it is output to outside or exports to ADC.
Second channel, by RL5 input signals, by U3B, RL4, RL6, U6, U7, RL7, is exported by signal source J6 in J5.
U3B buffers as signal, and it is binary channels single-ended mode or single channel difference modes that RL4, which can switch binary channels power amplifier,
Amplification.RL6 switchings by U6 can make signal phase positive or anti-phase, and U7 is power-amplifier stage, and RL7 control signals are output to
Outside or ADC.
When amplifier of the binary channels power amplifier as binary channels single-ended mode, RL1 set, RL2 set or multiple
Position, RL3 set, RL4 set, RL5 set, RL6 set or reset, RL7 set.Now, first passage and second channel by
In RL4 set, it is not attached to together, is completely self-contained.
When amplifier of the power amplifier as single channel difference modes, RL1 set, RL2 set, RL3 set, RL4
Reset, RL5 set or reset, RL6 reset, RL7 set.Now, the signal of first passage and second channel inputs from J4, J6
Do not work.The anti-phase amplification of first path signal, the positive amplification of alternate path signal.Output signal is from the anode among J3, J5
Take out.If input signal V0, gain G, the signal amplitude of Single-end output is G*V0, when being arranged to single channel difference output,
Because the signal phase of two passage outputs differs 180 degree, when taking out voltage from the anode of two-way output, signal amplitude is
2*G*V0, amplitude are 2 times of Single-end output, need not expanded output amplitude, extending application in the case of bigger voltage
Scope.
In addition, the calibration of binary channels power amplifier is that each passage is calibrated respectively, therefore, using first passage as
Example explanation.Calibrate circuit and include digital regulation resistance (R12, R22), ADC and MCU compositions.
Calibrate soluble problem：Reduce due to input offset voltage caused by amplifying circuit (including amplifier etc.), it is defeated
Enter offset current etc..And self calibration can be done after environment temperature change, the output for changing due to temperature and increasing is lacked of proper care electric
Pressure drop is low.
Calibrate circuit working method：RL1 resets, and input is connected to GND, RL2 set or reset, and RL3 resets, by first
Lead-out terminal RL3 is connected to ADC, MCU control ADC collection d. c. voltage signals, and MCU is adjusted by controlling digital regulation resistance
R12 resistance, feed back to U5 positive input.So as to adjust the voltage level of output, feedback control loop is formed.
Calibrate circuit operation principle：Digital regulation resistance both ends are connected on positive-negative power, and adjustment tap is controlled by MCU
Position, so as to provide different magnitudes of voltage, so as to adjust the voltage of operational amplifier U5 positive input terminals, to reach fine setting output electricity
The purpose of pressure.The DC offset voltage of output is reduced, reaches the purpose of calibration direct current output precision.Further, since power is put
Big device belongs to high power device, amplifier self-heating, receives the influence of temperature, and output direct current biasing can change, this school
Quasi- function can perform after heat engine or after variation of ambient temperature, can eliminate the output biasing brought due to temperature change
Drift.
In embodiments of the present invention, by setting selecting switch between first passage and second channel, to select first
It is that second phase adjusts level input signal to input buffer stage or the second input buffer stage, in selecting switch selection the second input buffering
When level adjusts level input signal for second phase, the signal of second phase adjustment level reception the second input buffer stage input, first
Phase adjustment level receives the signal of the first input buffer stage input, and first phase adjustment level and second phase adjust level to reception
Signal does not do phase and reversely adjusted, i.e. first passage and second channel individually exports voltage-to-ground, realizes binary channels list
End pattern；When the input buffer stage of selecting switch selection first adjusts level input signal for second phase, second phase adjustment level
Receive the signal of the first input buffer stage input, second phase adjustment level or first phase adjustment simultaneously with first phase adjustment level
Level is done phase to the signal of reception and reversely adjusted, i.e., first passage and the voltage-phase in second channel are opposite, amplitude is identical, real
Existing single channel difference modes, the amplitude of the voltage now exported between the second lead-out terminal and first lead-out terminal is each output
Terminal individually exports twice of voltage-to-ground amplitude, realizes in the case where not changing signal source output signal, expands double
The amplitude of channel power amplifier output voltage, be advantageous to meet the applications such as test high-power audio equipment, high pressure magnetic material
Occasion needs the demand of sufficiently large voltage amplitude.Meanwhile the use of selecting switch, binary channels power amplifier can be in single channels
Free switching between difference modes and binary channels single-ended mode, meet different voltage amplitude demands, be advantageous to extend binary channels
The application of power amplifier.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (9)
- A kind of 1. binary channels power amplifier, it is characterised in that including：First passage, successively including first input end, the first input buffer stage, first phase adjustment level, first voltage amplification Level, the first current expansion level and first lead-out terminal, for carrying out voltage amplification and power amplification to input signal；Second channel, successively including the second input terminal, the second input buffer stage, second phase adjustment level, second voltage amplification Level, the second current expansion level and the second lead-out terminal, for carrying out voltage amplification and power amplification to input signal；Selecting switch, two inputs of the selecting switch connect the output end of the first input buffer stage and described respectively The output end of second input buffer stage, the output end of the selecting switch connect the input of the second phase adjustment level, used In selecting the first input buffer stage or the second input buffer stage to adjust level input signal for the second phase, selecting When to select the second input buffer stage be that the second phase adjusts level input signal, second phase adjustment level and described the One phase adjustment level is not done phase to the signal of reception and reversely adjusted, second lead-out terminal and the first lead-out terminal point Voltage-to-ground is not exported not individually；When selecting the first input buffer stage to adjust level input signal for the second phase, institute State second phase adjustment level and first phase adjustment level while receive the signal of the first input buffer stage input, it is described Second phase adjusts level or first phase adjustment level is done phase to the signal of reception and reversely adjusted, second lead-out terminal The amplitude of the voltage exported between the first lead-out terminal is that each lead-out terminal individually exports the two of voltage-to-ground amplitude Times.
- 2. binary channels power amplifier as claimed in claim 1, it is characterised in that also include：Circuit is calibrated, the first end of the calibration circuit connects with the first lead-out terminal and second lead-out terminal respectively Connect, the second end of the calibration circuit respectively with the input of the first voltage amplifying stage and the second voltage amplifying stage Input connects, for gathering the DC voltage data of the first lead-out terminal and second lead-out terminal respectively, according to The DC voltage data point reuse of the first lead-out terminal adds the bias voltage of the first voltage amplifying stage；According to described The DC voltage data point reuse of two lead-out terminals adds the bias voltage of the second voltage amplifying stage.
- 3. binary channels power amplifier as claimed in claim 2, it is characterised in that the calibration circuit, including：Two ADC analog-digital converters, it is connected respectively with the first lead-out terminal and second lead-out terminal, for adopting respectively Collect the first lead-out terminal and the DC voltage data of second lead-out terminal；MCU micro-control units, it is connected with two ADC, for receiving the DC voltage data of two ADC feedbacks, root The first letter of the bias voltage for adjusting the first voltage amplifying stage is sent according to the DC voltage data of the first lead-out terminal Number；The of the bias voltage for adjusting the second voltage amplifying stage is sent according to the DC voltage data of second lead-out terminal Binary signal；Two voltage adjusting devices, are connected with the MCU, a voltage adjusting device in two voltage adjusting devices with it is described The input connection of first voltage amplifying stage, another voltage adjusting device and the input of the second voltage amplifying stage connect Connect, bias voltage of one voltage adjusting device for adjusting the first voltage amplifying stage according to first signal Size；Another described voltage adjusting device is used for the biased electrical that the second voltage amplifying stage is adjusted according to the secondary signal The size of pressure.
- 4. binary channels power amplifier as claimed in claim 3, it is characterised in that the voltage adjusting device is digital current potential Device.
- 5. binary channels power amplifier as claimed in claim 3, it is characterised in that the voltage adjusting device is DAC digital-to-analogues Converter.
- 6. binary channels power amplifier as claimed in claim 3, it is characterised in that the voltage adjusting device is constant-current source.
- 7. the binary channels power amplifier as any one of claim 1 to 6, it is characterised in that also include：Two overcurrent protection modules, it is separately mounted in the first current expansion level and the second current expansion level, is used for The output current of the first current expansion level and the second current expansion level is detected respectively, is detecting first electric current When the output current of extension level is more than pre-set current value, the output current of the first current expansion level is reduced；Detecting When stating the output current of the second current expansion level and being more than the pre-set current value, the output electricity of the second current expansion level is reduced Stream.
- 8. the binary channels power amplifier as any one of claim 1 to 6, it is characterised in that first input is slow Rush level and described second and input the operational amplifier that buffer stage is AD8066 models.
- 9. the binary channels power amplifier as any one of claim 1 to 6, it is characterised in that the first voltage is put Big level and the second voltage amplifying stage are the operational amplifier of AD8009 models.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610836324.8A CN107846199B (en) | 2016-09-21 | 2016-09-21 | Dual-channel power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610836324.8A CN107846199B (en) | 2016-09-21 | 2016-09-21 | Dual-channel power amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107846199A true CN107846199A (en) | 2018-03-27 |
| CN107846199B CN107846199B (en) | 2022-09-30 |
Family
ID=61656848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610836324.8A Active CN107846199B (en) | 2016-09-21 | 2016-09-21 | Dual-channel power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107846199B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4330756A (en) * | 1979-06-27 | 1982-05-18 | Thomson-Csf | Audio-frequency amplifying device |
| US20050025323A1 (en) * | 2003-06-09 | 2005-02-03 | Stmicroelectronics S.R.L. | Multi-channel power amplifier with channels independently self-configuring to a bridge or single-ended output, particularly for audio applications |
| US20100109789A1 (en) * | 2008-09-15 | 2010-05-06 | Stmicroelectronics S.R.L. | Radio frequency amplifier with digital amplitude modulation and method for controlling the delivering of power |
| CN101807910A (en) * | 2009-02-09 | 2010-08-18 | 罗姆股份有限公司 | Input selector, signal processing circuit, audio signal processing circuit |
| US20100327969A1 (en) * | 2009-06-30 | 2010-12-30 | Avago Technologies Wireless Ip (Singapore) Pte. Ltd. | Power amplifier having parallel amplification stages and associated impedance matching networks |
-
2016
- 2016-09-21 CN CN201610836324.8A patent/CN107846199B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4330756A (en) * | 1979-06-27 | 1982-05-18 | Thomson-Csf | Audio-frequency amplifying device |
| US20050025323A1 (en) * | 2003-06-09 | 2005-02-03 | Stmicroelectronics S.R.L. | Multi-channel power amplifier with channels independently self-configuring to a bridge or single-ended output, particularly for audio applications |
| US20100109789A1 (en) * | 2008-09-15 | 2010-05-06 | Stmicroelectronics S.R.L. | Radio frequency amplifier with digital amplitude modulation and method for controlling the delivering of power |
| CN101807910A (en) * | 2009-02-09 | 2010-08-18 | 罗姆股份有限公司 | Input selector, signal processing circuit, audio signal processing circuit |
| US20100327969A1 (en) * | 2009-06-30 | 2010-12-30 | Avago Technologies Wireless Ip (Singapore) Pte. Ltd. | Power amplifier having parallel amplification stages and associated impedance matching networks |
Non-Patent Citations (1)
| Title |
|---|
| 代明清等: "多通道声纳信号预处理系统设计", 《鱼雷技术》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107846199B (en) | 2022-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4828542B2 (en) | Impedance detector | |
| CN103248330B (en) | A kind of programmable gain amplifier of high-gain precision | |
| CN104750160B (en) | Output power control circuit of power amplifier | |
| CN100593910C (en) | A low power consumption comparator with mistuning calibration function | |
| CN102217192B (en) | Variable gain amplifier | |
| US10250210B2 (en) | Circuit and method for a high common mode rejection amplifier by using a digitally controlled gain trim circuit | |
| CN106405197B (en) | Flouride-resistani acid phesphatase 100V high precision electro current detection circuit | |
| JP2007027895A (en) | Current-voltage conversion circuit, and power consumption detection circuit and electronic equipment using the same | |
| CN102025326A (en) | Digital self-zero calibration circuit applied for operational amplifier | |
| US20150162878A1 (en) | Harmonics Cancellation Circuit for a Power Amplifier | |
| CN102394581A (en) | Full differential operational amplifier | |
| CN107241067A (en) | A kind of digital self calibration copped wave precision amplifier and implementation method | |
| CN116470890A (en) | Hysteresis comparison circuit and electronic equipment | |
| TWI470394B (en) | Voltage generator | |
| CN100589319C (en) | Power amplifier temperature compensation device and method | |
| EP3237914A1 (en) | Log-linear power detector | |
| CN100379155C (en) | Level shift circuit | |
| CN107846199A (en) | Binary channels power amplifier | |
| CN106602846A (en) | Full-digital constant-voltage constant-current four-quadrant power supply | |
| WO2023109427A1 (en) | Power regulation circuit of power amplifier and power amplifier | |
| CN104052419B (en) | Third stage amplifier | |
| CN115529041A (en) | Sectional optional signal conditioning circuit and measuring device | |
| CN113078923B (en) | Signal transmission network, chip and signal processing device | |
| JP2009290520A (en) | Transimpedance amplifier, regulated transimpedance amplifier and optical receiver | |
| Ivanov et al. | Universal programmable DC amplifier for low frequency noise measurements |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |