CN206389335U - A kind of audio voltage follows circuit - Google Patents
A kind of audio voltage follows circuit Download PDFInfo
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- CN206389335U CN206389335U CN201621346733.1U CN201621346733U CN206389335U CN 206389335 U CN206389335 U CN 206389335U CN 201621346733 U CN201621346733 U CN 201621346733U CN 206389335 U CN206389335 U CN 206389335U
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Abstract
The utility model embodiment discloses a kind of audio voltage and follows circuit, is related to audio electronics technical field.The audio voltage follows circuit to include：Sound channel peak-detector circuit, peak envelop detection circuit, impedance inverter circuit and dynamically boosted circuit；The input of the sound channel peak-detector circuit receives audio input signal, and output end is connected with the input of the peak envelop detection circuit；The output end of the peak envelop detection circuit is connected with the input of the impedance inverter circuit；The output end of the impedance inverter circuit is connected with the input of the dynamically boosted circuit；The output end of the dynamically boosted circuit is the output end that the audio voltage follows circuit.Audio voltage described in the utility model embodiment follows circuit to be converted into the change to impedance to be controlled by the change of audio signal, output voltage is adjusted according to the change of impedance, realize output voltage to follow input audio signal, be effectively improved the efficiency of power amplifier.
Description
Technical field
The utility model embodiment is related to audio electronics technical field, and particularly a kind of audio voltage follows circuit.
Background technology
Current electronic production development, also increasingly be intended to miniaturization and portability, and for miniaturization and it is portable
The product of change, also most of use batteries power, to ensure that product has enough working times, also the efficiency of product is proposed higher
Requirement.In the audio system of Current electronic product, power amplifier is the core of whole audio, is consumption in whole system
Energy the best part, the height of its efficiency also determines the height of whole audio system efficiency, therefore its efficiency is shadow
The determinant of overall efficiency is rung, so, how to improve the efficiency of power amplifier turns into the emphasis that current power amplifier is studied.
At present, the technology one of common raising efficiency power amplifier is that simulated power amplifier is changed into digital power to put
Big device, that is, AB classes are changed into D classes or E classes；Two be to use multitone ring technology, and each sound is progressively turned on according to the size of power
Circle.For first method, technology is highly developed, and the lifting to efficiency has accomplished ultimate attainment, empty without great lifting
Between；And second method, have very high requirement to power amplifier and corresponding algorithm, and to the loudspeaker of multitone ring will
Ask also very high, the cost caused it is high.
Utility model people has found at least there is following technical problem in the prior art during the application is studied：Mesh
The power supply of preceding audio-frequency power amplifier, no matter input signal size whether, be all to be powered by the demand of peak power, and high
Power needs high voltage, but voltage is higher, and current drain is bigger, and efficiency is lower.
Utility model content
The utility model embodiment technical problem to be solved is that the power supplying efficiency of power amplifier is relatively low.
In order to solve the above-mentioned technical problem, a kind of audio voltage described in the utility model embodiment follows circuit to employ
Technical scheme as described below：
A kind of audio voltage follows circuit, including：Sound channel peak-detector circuit, peak envelop detection circuit, impedance conversion
Circuit and dynamically boosted circuit；
The input of the sound channel peak-detector circuit receives audio input signal, output end and the peak envelop detection
The input connection of circuit；The output end of the peak envelop detection circuit is connected with the input of the impedance inverter circuit；
The output end of the impedance inverter circuit is connected with the input of the dynamically boosted circuit；The output of the dynamically boosted circuit
Hold the output end that circuit is followed for the audio voltage.
Further, described audio voltage follows circuit, and the sound channel peak-detector circuit includes：Receive left audio
The L channel peak-detector circuit of input signal and the R channel peak-detector circuit for receiving right audio channel input signal；
The output end of the L channel peak-detector circuit is connected with the input of the peak envelop detection circuit；
The output end of the R channel peak-detector circuit is connected with the input of the peak envelop detection circuit.
Further, described audio voltage follows circuit, and the L channel peak-detector circuit includes：Resistance R3, resistance
R7, resistance R11, resistance R13, electric capacity C1, diode D2, operational amplifier U21；
The 3rd pin of the operational amplifier U21 connects left audio by the resistance R3 and the electric capacity C1 and inputted
Signal, the 3rd pin of the operational amplifier U21 is also grounded by the resistance R7；
The 2nd pin of the operational amplifier U21 is grounded by the resistance R13, and the 2nd of the operational amplifier U21 the
Pin also passes through the input of the resistance R11 connections peak envelop detection circuit；
The 1st pin of the operational amplifier U21 connects the positive pole of the diode D2, passes through the diode D2 connections
The input of the peak envelop detection circuit；
The 8th pin of the operational amplifier U21 connects power input；The 4th pin ground connection of the operational amplifier U21.
Further, described audio voltage follows circuit, and the R channel peak-detector circuit includes：Resistance R2, resistance
R5, resistance R8, resistance R10, electric capacity C2, diode D3, operational amplifier U22；
The 5th pin of the operational amplifier U22 connects right audio channel input signal by the resistance R8 and electric capacity C2,
The 5th pin of the operational amplifier U22 is also grounded by the resistance R10；
The 2nd pin of the operational amplifier U22 is grounded by the resistance R5, and the 2nd of the operational amplifier U22 draws
Pin also passes through the input of the resistance R2 connections peak envelop detection circuit；
The 7th pin of the operational amplifier U22 connects the positive pole of the diode D3, passes through the diode D3 connections
The input of the peak envelop detection circuit.
Further, described audio voltage follows circuit, and the peak envelop detection circuit includes：Resistance R1, resistance
R12, electric capacity C3, diode D1, operational amplifier U11；
The 3rd pin of the operational amplifier U11 is connected with the output end of the sound channel peak-detector circuit, the computing
Amplifier U11 the 3rd pin is also grounded by the resistance R1；
The 2nd pin of the operational amplifier U11 and the 1st pin connect the positive pole of the diode D1, and by described
The input of the diode D1 connections impedance inverter circuit；
The 8th pin of the operational amplifier U11 connects power input；The pins of operational amplifier U11 the 4th are grounded；
The negative pole of the diode D1 is also grounded by resistance R12 and electric capacity C3 in parallel.
Further, described audio voltage follows circuit, and the impedance inverter circuit includes：Resistance R4, resistance R6, resistance
R9, resistance R16, metal-oxide-semiconductor Q1, operational amplifier U12；
The 5th pin of the operational amplifier U12 connects the output end of peak value envelope detection circuit；
The 6th pin of the operational amplifier U12 is grounded by the resistance R9, and the 6th of the operational amplifier U12 draws
Source S of the pin also with the metal-oxide-semiconductor Q1 is connected；
The 7th pin of the operational amplifier U12 is grounded by the resistance R4 and resistance R6, the operation amplifier
Device U12 the 7th pin is also connected by the resistance R4 with the grid G of the metal-oxide-semiconductor Q1；
The drain D of the metal-oxide-semiconductor Q1 is connected by the resistance R16 with the input of dynamically boosted circuit.
Further, described audio voltage follows circuit, and the dynamically boosted circuit becomes comprising one according to the impedance
The impedance for changing electronic feedback inputs the boosting integrated circuit U3 of adjust automatically output voltage.
Compared with prior art, the utility model embodiment mainly has following beneficial effect：
The utility model embodiment discloses a kind of audio voltage and follows circuit, is related to audio electronics technical field.It is described
Audio voltage follows circuit to include：Sound channel peak-detector circuit, peak envelop detection circuit, impedance inverter circuit and dynamically boosted
Circuit；The input of the sound channel peak-detector circuit receives audio input signal, output end and peak envelop detection electricity
The input connection on road；The output end of the peak envelop detection circuit is connected with the input of the impedance inverter circuit；Institute
The output end for stating impedance inverter circuit is connected with the input of the dynamically boosted circuit；The output end of the dynamically boosted circuit
The output end of circuit is followed for the audio voltage.Audio voltage described in the utility model embodiment follows circuit to believe audio
Number change the change to impedance is converted into be controlled, output voltage is automatically adjusted according to the change of impedance, so that real
Show output voltage to follow input audio signal, be effectively improved the efficiency of power amplifier.
Brief description of the drawings
Fig. 1 is the structured flowchart that the utility model embodiment audio voltage follows circuit.
Fig. 2 is the structured flowchart of the utility model embodiment sound channel peak-detector circuit.
Fig. 3 is the circuit theory diagrams that the utility model embodiment audio voltage follows circuit.
Description of reference numerals：
1- sound channels peak-detector circuit, 2- peak envelop detections circuit, 3- impedance inverter circuits, the dynamically boosted circuits of 4-,
11- L channels peak-detector circuit, 12- R channel peak-detector circuits.
Embodiment
For the ease of understanding the utility model, utility model is described more fully below with reference to relevant drawings.
Preferred embodiment of the present utility model is given in accompanying drawing.But, the utility model is realized in many different forms, not
It is limited to embodiment described herein.On the contrary, the purpose for providing these embodiments is made to disclosure of the present utility model
Understanding more it is thorough comprehensively.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to technology of the present utility model
The implication that the technical staff in domain is generally understood that is identical.It is herein to be in term used in the description of the present utility model
The purpose of description specific embodiment, it is not intended that in limitation the utility model.
It is the structured flowchart that the utility model embodiment audio voltage follows circuit with reference to Fig. 1.The audio voltage is followed
Circuit includes：Sound channel peak-detector circuit 1, peak envelop detection circuit 2, impedance inverter circuit 3 and dynamically boosted circuit 4.
The input of sound channel peak-detector circuit 1 receives audio input signal, output end and peak envelop detection circuit 2
Input is connected；The input of peak envelop detection circuit 2 is connected with the output end of sound channel peak-detector circuit 1, peak envelope
The output end of detecting circuit 2 is connected with the input of impedance inverter circuit 3；The input and peak envelope of impedance inverter circuit 3
The output end connection of detecting circuit 2,3 output ends of impedance inverter circuit are connected with the input of dynamically boosted circuit 4；Dynamic rises
One input of volt circuit 4 is connected with the output end of impedance inverter circuit 3, and the output end of dynamically boosted circuit 4 carries out voltage
Output.Power input accesses the audio voltage and follows circuit to be used to power to whole circuit.
Fig. 2 is the structured flowchart of the utility model embodiment sound channel peak-detector circuit.With reference to shown in Fig. 2, the sound channel
Peak-detector circuit 1 includes：L channel peak-detector circuit 11 and R channel peak-detector circuit 12.The audio signal of L channel
Input L channel peak-detector circuit 11, the audio signal input R channel peak-detector circuit 12 of R channel, L channel peak value
The audio signal of detecting circuit 11 and R channel peak-detector circuit 12 respectively to L channel and R channel is amplified and detection is positive
Peak signal, and it is output to peak envelop detection circuit 2.
Peak envelop detection circuit 2 receives the defeated of L channel peak-detector circuit 11 and R channel peak-detector circuit 12
Go out after signal, the two output signals are synthesized into a signal, and detect the peak envelope of the signal, be then output to impedance change
Change circuit 3.
Impedance inverter circuit connects 3 and received after peak envelope signal, and peak envelope signal is converted into corresponding impedance, and
This impedance is loaded into dynamically boosted circuit 4.Then dynamically boosted circuit 4 according to the change of the impedance of loading come adjust automatically
Output voltage, and by this voltage-drop loading to power amplifier.
Audio voltage described in the utility model embodiment follows circuit by the course of work, by the change of audio signal
Change is converted into the change to impedance to be controlled, and output voltage is automatically adjusted according to the change of impedance, it is achieved thereby that defeated
Go out voltage to follow input audio signal.
It is the circuit theory diagrams that the utility model embodiment audio voltage follows circuit with reference to Fig. 3.The audio voltage with
Include with circuit：L channel peak-detector circuit 11, R channel peak-detector circuit 12, peak envelop detection circuit 2, impedance become
Change circuit 3 and dynamically boosted circuit 4.
The L channel peak-detector circuit 11 includes：Resistance R3, resistance R7, resistance R11, resistance R13, electric capacity C1, two
Pole pipe D2, operational amplifier U21.An electric capacity C1 termination left audio input signal, another terminating resistor R3；Resistance R3 mono-
Termination capacitor C1, the other end is grounded by resistance R7, the 3rd pin of the other end of the resistance R3 also with operational amplifier U21
Connection.Operational amplifier U21 the 2nd pin is grounded by resistance R13, the 2nd pin of the operational amplifier U21 also with resistance
R11 connections；Operational amplifier U21 the 1st pin connects diode D2 positive pole；It is defeated that operational amplifier U21 the 8th pin connects power supply
Enter；Operational amplifier U21 the 4th pin ground connection.The termination operational amplifiers of resistance R11 mono- U21 the 2nd pin, the other end and peak
It is worth the input connection of envelope detection circuit 2；The input of diode D2 negative pole connection peak value envelope detection circuit 2.It is described
L channel peak-detector circuit 11 is amplified and detection to the audio input signal of L channel, detects the positive peak value of L channel
Exported.
The R channel peak-detector circuit 12 includes：Resistance R2, resistance R5, resistance R8, resistance R10, electric capacity C2, two poles
Pipe D3, operational amplifier U22.An electric capacity C2 termination left audio input signal, another terminating resistor R8；Resistance R8 one end
Electric capacity C2 is met, the other end is connected with operational amplifier U22 the 5th pin, and the other end is also grounded by resistance R10；It is described
The resistance R10 other end is also connected with operational amplifier U22 the 5th pin.Operational amplifier U22 the 5th pin passes through resistance
R5 is grounded, and the pins of operational amplifier U22 the 5th are also connected with resistance R2；Operational amplifier U22 the 7th pin connects diode
D3 positive pole.Operational amplifier U21 and operational amplifier U22 belong to same integrated circuit, share same power input.Resistance
The termination operational amplifiers of R2 mono- U22 the 6th pin, the other end is connected with the input of peak envelop detection circuit 2；Diode D3
Negative pole connect the input of peak envelop detection circuit 2.The R channel peak-detector circuit 12, to the audio input of R channel
Signal is amplified and detection, and the positive peak value of detection R channel is exported.
The peak envelop detection circuit 2 includes：Resistance R1, resistance R12, electric capacity C3, diode D1, operational amplifier
U11.The termination L channels of resistance R1 mono- peak-detector circuit 11 is put with the output end of R channel peak-detector circuit 12 and computing
Big device U11 the 3rd pin, resistance R1 other end ground connection.Operational amplifier U11 the 2nd pin is connected two with its 1st pin
Pole pipe D1 positive pole；Operational amplifier U11 the 8th pin connects power input；The pins of operational amplifier U11 the 4th are grounded.Diode
D1 negative pole is grounded by electric capacity C3 and resistance R12 in parallel, and is connected with the input of impedance inverter circuit 3.In parallel
Electric capacity C3 is connected with resistance R12 one end with operational amplifier U11 the 1st pin and the input of impedance inverter circuit 3, another
End ground connection.The peak envelop detection circuit 2, by the defeated of L channel peak-detector circuit 11 and R channel peak-detector circuit 12
Go out signal to be combined into all the way, and the peak envelope of the signal is extracted, be converted into corresponding direct voltage output to impedance
Translation circuit 3.
The impedance inverter circuit 3 includes：Resistance R4, resistance R6, resistance R9, resistance R16, metal-oxide-semiconductor Q1, operational amplifier
U12.Operational amplifier U12 the 5th pin connects the output end of peak envelop detection circuit 2；Operational amplifier U12 the 6th pin
It is grounded by resistance R9, and access metal-oxide-semiconductor Q1 source S；The pin connecting resistance R4 of operational amplifier U12 the 7th.Operational amplifier
U11 and operational amplifier U12 belong to same integrated circuit, share same power input.Resistance R4 mono- terminates operational amplifier
U12 the 7th pin, the other end is grounded by resistance R6, and is connected into metal-oxide-semiconductor Q1 grid G.Metal-oxide-semiconductor Q1 grid G connecting resistance R4
With resistance R6；Metal-oxide-semiconductor Q1 source S connecting resistance R9 and operational amplifier U12 the 6th pin；Metal-oxide-semiconductor Q1 drain D passes through electricity
Resistance R16 is connected with the input of dynamically boosted circuit 4.The impedance inverter circuit 3, will receive peak envelope signal voltage and turns
Corresponding Impedance feedback is changed into dynamically boosted circuit 4.
Described dynamically boosted circuit 4 includes a boosting integrated circuit U3 and its corresponding peripheral circuit；Boosting collection
Worked into circuit U 3 by connecting input power.The preferred model of boosting integrated circuit U3 described in the utility model embodiment
TPS61088.The impedance that the dynamically boosted circuit 4 feeds back according to the impedance inverter circuit 3 of acquisition inputs automatically to adjust defeated
Go out voltage.
Audio voltage described in the utility model embodiment follows the circuit course of work as follows：
The left channel signals of audio signal input L channel peak-detector circuit 11, described L channel peak by electric capacity C1
Value detecting circuit 11 is amplified and detection to the audio input signal of L channel, detects the positive peak value of L channel.It is wherein electric
Hold C1 and play a part of stopping direct current, resistance R3 and resistance R7 is used to carry out partial pressure to the audio signal of input, by adjusting resistance
R3 and resistance R7 ratio, thus it is possible to vary the size of input signal, to prevent the overload of input signal；Operational amplifier U21 with
Diode D2, resistance R11, resistance R13 constitute a positive peak detection circuit, and diode D2 effect is the positive peak of detection
Value, the ratio that resistance R11 and resistance R13 is adjusted in addition can adjust the multiplication factor of this circuit, so as to can adjust whole circuit
Threshold values is started to control, multiplication factor is bigger, start to control that threshold values is lower, multiplication factor is smaller, starts to control threshold values higher.
The right-channel signals of audio signal input R channel peak-detector circuit 12, described R channel peak by electric capacity C2
Value detecting circuit 12 is amplified and detection to the audio input signal of R channel, detects the positive peak value of R channel.R channel
The operation principle of peak-detector circuit 12 is identical with the principle of L channel peak-detector circuit 11.
Audio signal is input to peak value bag after L channel peak-detector circuit 11 and R channel peak-detector circuit 12
Network detecting circuit 2.The peak envelop detection circuit 2 is by L channel peak-detector circuit 11 and R channel peak-detector circuit 12
The signal of output is combined into all the way, and the peak envelope of signal is extracted, and is converted into corresponding DC voltage.Wherein computing
The signal that amplifier U11 is used to export L channel peak-detector circuit 11 and R channel peak-detector circuit 12 unifies road, it
Multiplication factor be one times；Resistance R12, electric capacity C3 and diode D1 constitute a positive peak envelope and follow the trail of circuit, resistance
R12 and electric capacity C3 constitutes a RC filter circuit, and the RC filter circuits have two effects：One is the load as wave detector,
Demodulated output signal envelope voltage is produced at two ends；Two be to filter out the high fdrequency component in demodulation current.Therefore, the RC is filtered back
1/2 π fC must are fulfilled in road<<R, wherein f are the low-limit frequency of input signal.Signal comes interim, if voltage is in raised bench
Section, signal begins through diode D1 and charged to electric capacity C3, because diode D1 forward impedance is very small, the electricity on electric capacity C3
Pressure is risen as signal rises, if the voltage of input signal declines, and electric capacity C3 begins through resistance R12 electric discharges, because of electricity
The resistance for hindering R12 is very big, before the arriving of next voltage rising period, and the voltage on electric capacity C3 is almost without under what
Drop, process is moved in circles, and the voltage waveform consistent with envelope (input signal) is obtained on electric capacity C3, there is the fluctuating of very little, therefore
Claim envelope detection；The essence of detection process is that signal is charged by diode D1 to load capacitance C3 and load capacitance C3 is to load
The process of resistance R12 electric discharges, charge constant is Rd* C3, RdFor diode forward conducting resistance, discharge time constant is
R12*C3, usual R12>Rd, therefore charge fast, electric discharge slowly for electric capacity C3, after several cycles, the output of wave detector
Voltage is progressively set up in charge and discharge process, and the voltage is to diode D1 one big negative voltage of formation, so that two poles
Pipe D1 is just turned near the peak value of input voltage, and ON time is very short, conducting electric current very little, when electric capacity C3 discharge and recharge reaches
After dynamic equilibrium, its voltage is to make zigzag fluctuation by the signal period, and its average value is stable, and changing rule and input
The envelope variation rule of signal is identical, it is achieved thereby that the tracking to input signal envelope.
Signal is output to impedance inverter circuit 3 after peak envelop detection circuit 2.The impedance inverter circuit 3 will connect
The peak envelope signal voltage conversion received is into corresponding impedance.Impedance inverter circuit 3 receives signal peak envelope voltage
Afterwards, by the dynamic isolation for calculating amplifier U12, exported from its 7th pin, then after the partial pressure by resistance R4 and resistance R6, plus
Enter the grid G to metal-oxide-semiconductor Q1, while metal-oxide-semiconductor Q1 source S is connected to operational amplifier U12 the 6th pin, so as to form metal-oxide-semiconductor
Q1 VGS voltages, allow metal-oxide-semiconductor Q1 to turn on, and VGS voltages are lower, and metal-oxide-semiconductor Q1 turns on more insufficient, its drain D and source S
On impedance it is higher, VGS voltages are higher, and metal-oxide-semiconductor Q1 turns on more abundant, and the impedance in its drain D and source S is got over
It is low, so as to realize conversion of the voltage to impedance；Wherein adjustment resistance R4 and resistance R6 intrinsic standoff ratios, can adjust metal-oxide-semiconductor Q1 conducting
Threshold value, so that can adjust whole circuit starts to control threshold values；Other also adjustable resistance R9 and resistance R16 resistance value, so that
Adjust the impedance value of whole backfeed loop.
Signal is input to dynamically boosted circuit 4 after impedance inverter circuit 3.The dynamically boosted circuit 4, is received
After the output signal of impedance inverter circuit 3, according to the change of impedance come adjust automatically output voltage, impedance is smaller, output voltage
Higher, impedance is bigger, and output voltage is lower, so as to realize the purpose that follows of the output voltage to input signal.
The utility model embodiment audio voltage follows circuit, L channel peak-detector circuit 11, R channel peak detection
Circuit 12, peak envelop detection circuit 2, impedance inverter circuit 3 and the dynamically boosted cooperating of circuit 4, by following input to believe
Number peak envelope realize the control to power amplifier supply voltage, when input signal is small, supply voltage is just low, when defeated
Enter signal it is big when, supply voltage is just high, power amplifier supply voltage dynamic change according to the size of input signal, in real time
Adjust power amplifier operating voltage, low voltage operating during small-signal, high voltage operation during big signal, change no matter
Output power and small all with the mode of same power voltage supply, greatly improves the efficiency of power amplifier；Use in addition
Very succinct circuit realiration power amplifier operating voltage is followed to input audio signal, on the one hand saves cost,
On the other hand the reliability of work is also improved.
The utility model is not limited to above-mentioned embodiment, and described above is preferred embodiment of the present utility model, the reality
Apply example to be merely to illustrate the utility model rather than limit scope of the present utility model, it is noted that for the art
Those of ordinary skill for, on the premise of the utility model principle is not departed from, some improvement and modification can also be made, this
The improvement and modification of a little equivalent form of values also should be regarded as being included in protection domain of the present utility model.
Claims (7)
1. a kind of audio voltage follows circuit, it is characterised in that including：Sound channel peak-detector circuit, peak envelop detection circuit,
Impedance inverter circuit and dynamically boosted circuit；
The input of the sound channel peak-detector circuit receives audio input signal, output end and the peak envelop detection circuit
Input connection；The output end of the peak envelop detection circuit is connected with the input of the impedance inverter circuit；It is described
The output end of impedance inverter circuit is connected with the input of the dynamically boosted circuit；The output end of the dynamically boosted circuit is
The audio voltage follows the output end of circuit.
2. audio voltage according to claim 1 follows circuit, it is characterised in that the sound channel peak-detector circuit bag
Include：Receive the L channel peak-detector circuit of left audio input signal and receive the R channel of right audio channel input signal
Peak-detector circuit；
The output end of the L channel peak-detector circuit is connected with the input of the peak envelop detection circuit；
The output end of the R channel peak-detector circuit is connected with the input of the peak envelop detection circuit.
3. audio voltage according to claim 2 follows circuit, it is characterised in that the L channel peak-detector circuit bag
Include：Resistance R3, resistance R7, resistance R11, resistance R13, electric capacity C1, diode D2, operational amplifier U21；
The 3rd pin of the operational amplifier U21 connects left audio input signal by the resistance R3 and the electric capacity C1,
The 3rd pin of the operational amplifier U21 is also grounded by the resistance R7；
The 2nd pin of the operational amplifier U21 is grounded by the resistance R13, the 2nd pin of the operational amplifier U21
Also pass through the input of the resistance R11 connections peak envelop detection circuit；
The 1st pin of the operational amplifier U21 connects the positive pole of the diode D2, by the diode D2 connections Suo Shu
The input of peak envelop detection circuit；
The 8th pin of the operational amplifier U21 connects power input；The 4th pin ground connection of the operational amplifier U21.
4. audio voltage according to claim 2 follows circuit, it is characterised in that the R channel peak-detector circuit bag
Include：Resistance R2, resistance R5, resistance R8, resistance R10, electric capacity C2, diode D3, operational amplifier U22；
The 5th pin of the operational amplifier U22 connects right audio channel input signal by the resistance R8 and electric capacity C2, described
Operational amplifier U22 the 5th pin is also grounded by the resistance R10；
The 2nd pin of the operational amplifier U22 is grounded by the resistance R5, and the 2nd pin of the operational amplifier U22 is also
Pass through the input of the resistance R2 connections peak envelop detection circuit；
The 7th pin of the operational amplifier U22 connects the positive pole of the diode D3, by the diode D3 connections Suo Shu
The input of peak envelop detection circuit.
5. audio voltage according to claim 1 follows circuit, it is characterised in that the peak envelop detection circuit bag
Include：Resistance R1, resistance R12, electric capacity C3, diode D1, operational amplifier U11；
The 3rd pin of the operational amplifier U11 is connected with the output end of the sound channel peak-detector circuit, the operation amplifier
Device U11 the 3rd pin is also grounded by the resistance R1；
The 2nd pin of the operational amplifier U11 and the 1st pin connect the positive pole of the diode D1, pass through the diode
The input of the D1 connections impedance inverter circuit；
The 8th pin of the operational amplifier U11 connects power input；The pins of operational amplifier U11 the 4th are grounded；
The negative pole of the diode D1 is also grounded by resistance R12 and electric capacity C3 in parallel.
6. audio voltage according to claim 1 follows circuit, it is characterised in that the impedance inverter circuit includes：Electricity
Hinder R4, resistance R6, resistance R9, resistance R16, metal-oxide-semiconductor Q1, operational amplifier U12；
The 5th pin of the operational amplifier U12 connects the output end of peak value envelope detection circuit；
The 6th pin of the operational amplifier U12 is grounded by the resistance R9, and the 6th pin of the operational amplifier U12 is also
It is connected with the source S of the metal-oxide-semiconductor Q1；
The 7th pin of the operational amplifier U12 is grounded by the resistance R4 and resistance R6, the operational amplifier
U12 the 7th pin is also connected by the resistance R4 with the grid G of the metal-oxide-semiconductor Q1；
The drain D of the metal-oxide-semiconductor Q1 is connected by the resistance R16 with the input of dynamically boosted circuit.
7. audio voltage according to claim 1 follows circuit, it is characterised in that the dynamically boosted circuit includes one
The impedance fed back according to the impedance inverter circuit inputs the boosting integrated circuit U3 of adjust automatically output voltage.
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| CN201621346733.1U CN206389335U (en) | 2016-12-08 | 2016-12-08 | A kind of audio voltage follows circuit |
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| CN201621346733.1U CN206389335U (en) | 2016-12-08 | 2016-12-08 | A kind of audio voltage follows circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183690A (en) * | 2016-12-08 | 2018-06-19 | 深圳市三诺数字科技有限公司 | A kind of audio voltage follows circuit |
| CN109768692A (en) * | 2017-11-02 | 2019-05-17 | 深圳市纳芯威科技有限公司 | A kind of dynamically boosted system |
-
2016
- 2016-12-08 CN CN201621346733.1U patent/CN206389335U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183690A (en) * | 2016-12-08 | 2018-06-19 | 深圳市三诺数字科技有限公司 | A kind of audio voltage follows circuit |
| CN108183690B (en) * | 2016-12-08 | 2024-04-02 | 深圳市三诺数字科技有限公司 | Audio voltage follower circuit |
| CN109768692A (en) * | 2017-11-02 | 2019-05-17 | 深圳市纳芯威科技有限公司 | A kind of dynamically boosted system |
| CN109768692B (en) * | 2017-11-02 | 2024-05-31 | 深圳市纳芯威科技有限公司 | Dynamic boosting system |
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Granted publication date: 20170808 Effective date of abandoning: 20240402 |
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| AV01 | Patent right actively abandoned |
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| AV01 | Patent right actively abandoned |