CN206595966U - A kind of single-ended audio slip parallel circuit - Google Patents
A kind of single-ended audio slip parallel circuit Download PDFInfo
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- CN206595966U CN206595966U CN201720308655.4U CN201720308655U CN206595966U CN 206595966 U CN206595966 U CN 206595966U CN 201720308655 U CN201720308655 U CN 201720308655U CN 206595966 U CN206595966 U CN 206595966U
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Abstract
The utility model embodiment discloses a kind of single-ended audio slip parallel circuit, including：Operational amplifier, input resistance, feedback resistance, switch and electric capacity；Wherein, switch is connected after being connected with input resistance with the input of operational amplifier；Feedback resistance one end is connected between input resistance and switch, the output end connection of the other end and operational amplifier；Electric capacity one end is connected to the input of operational amplifier, and the other end is connected to the output end of main body operational amplifier.By the above-mentioned means, the utility model embodiment can.It is different from the situation of prior art, a kind of single-ended audio slip parallel circuit that the present embodiment is provided is directly accessed input and the feedback resistance array of Multichannel Parallel in input and output end, and selecting switch is built into OPA input, electric resistance array is selected by switching, realizes that the high-performance of multi-path choice and single-ended transfer difference function is combined.
Description
Technical field
The utility model embodiment is related to analog electronics technique field, and more particularly to a kind of single-ended audio turns differential electrical
Road.
Background technology
In audio frequency processing system chip, support MCVF multichannel voice frequency input signal is generally required, and selects wherein all the way to enter
Master control is handled.Due to there is substantial amounts of logic noise in SOC, it is necessary to be handled using the mode of differential signal, patrolling
Collect noise jamming and be converted to common mode disturbances, acted on suppressing with the common mode inhibition of difference amplifier.But believe because common audio is inputted
Number be single-ended signal, so need multiple signals selection and two functions of single-ended transfer difference signal.Existing common processing mode
There are two kinds：The first is directly to select input signal with variable connector；Second is that a preposition single-ended amplifier makees selector, so
The output of amplifier is taken to enter a single-ended transfer difference processing of circuit afterwards.Refering to Fig. 1, the first way in the application, at switch
Level transient state can with input signal change and change, cause switch resistance with input signal produce change, thus
Harmonic distortion can be produced, although by increasing switch size, limitation input signal amplitude can reduce harmonic distortion, but can increase
Area, reduces signal, and harmonic distortion performance is also difficult to carry out.Refering to Fig. 2, although second of circuit can solve the problem that the first
The shortcoming of scheme, but the single-ended amplifier of increased one-level, add function and area, and bring making an uproar by this one-level amplifier
Sound.
Utility model content
The utility model embodiment, can mainly solving the technical problems that provide a kind of single-ended audio slip parallel circuit
Reduce harmonic distortion and area is small.
In order to solve the above technical problems, the technical scheme that the utility model is used is：A kind of single-ended audio is provided to turn
Difference channel, including：Operational amplifier, input resistance, feedback resistance, switch and electric capacity；Wherein, switch connects with input resistance
Connect and be connected afterwards with the input of operational amplifier；Feedback resistance one end is connected between input resistance and switch, the other end and fortune
Calculate the output end connection of amplifier；Electric capacity one end is connected to the input of operational amplifier, and the other end is connected to main body computing and put
The output end of big device.
Wherein, the input resistance includes the first input resistance in the same direction, and the feedback resistance includes first and feeds back electricity in the same direction
Resistance, the switch includes first and switched in the same direction, and the electric capacity includes the first electric capacity in the same direction；Wherein, first switch and first in the same direction
It is connected after input resistance connection in the same direction with the input in the same direction of operational amplifier；First feedback resistance one end in the same direction is connected to first
Between input resistance in the same direction and the first switch in the same direction, the first output end connection of the other end and operational amplifier；First is electric in the same direction
Hold the input in the same direction that one end is connected to operational amplifier, the other end is connected to the first output end of main body operational amplifier.
Wherein, the input resistance also includes the first reverse input resistance, and it is reversely anti-that the feedback resistance also includes first
Feed resistance, the switch also includes the first reverser, and the electric capacity also includes the first reciprocal capacitance；Wherein, first reversely open
Pass is connected after being connected with the first reverse input resistance with the reverse input end of operational amplifier；First reverse feedback resistance one end connects
It is connected between the first reverse input resistance and the first reverser, the second output end connection of the other end and operational amplifier；The
Two reciprocal capacitance one end are connected to the reverse input end of operational amplifier, and it is second defeated that the other end is connected to main body operational amplifier
Go out end.
Wherein, the input resistance also includes the second input resistance in the same direction, and it is anti-in the same direction that the feedback resistance also includes second
Feed resistance, the switch also include the second switch in the same direction；Wherein, second in the same direction switch be connected with the second input resistance in the same direction after and
The input in the same direction connection of operational amplifier；Second feedback resistance one end in the same direction is connected to the second input resistance in the same direction and second same
To between switch, the first output end of the other end and operational amplifier is connected.
Wherein, the input resistance also includes the 3rd input resistance in the same direction, and it is anti-in the same direction that the feedback resistance also includes the 3rd
Feed resistance, the switch also includes the 3rd switch in the same direction；Wherein, the 3rd in the same direction switch be connected with the 3rd input resistance in the same direction after and
The input in the same direction connection of operational amplifier；3rd feedback resistance one end in the same direction is connected to the 3rd input resistance in the same direction and the 3rd same
To between switch, the first output end of the other end and operational amplifier is connected.
Wherein, the input resistance also includes the 4th input resistance in the same direction, and it is anti-in the same direction that the feedback resistance also includes the 4th
Feed resistance, the switch also includes the 4th switch in the same direction；Wherein, the 4th in the same direction switch be connected with the 4th input resistance in the same direction after and
The input in the same direction connection of operational amplifier；4th feedback resistance one end in the same direction is connected to the 4th input resistance in the same direction and the 4th same
To between switch, the first output end of the other end and operational amplifier is connected.
Wherein, the input resistance also includes the second reverse input resistance, and it is reversely anti-that the feedback resistance also includes second
Feed resistance, the switch also includes the second reverser；Wherein, after the second reverser is connected with the second reverse input resistance with
The reverse input end connection of operational amplifier；Second reverse feedback resistance one end is connected to the second reverse input resistance and second anti-
To between switch, the second output end of the other end and operational amplifier is connected.
Wherein, the input resistance also includes the 3rd reverse input resistance, and it is reversely anti-that the feedback resistance also includes the 3rd
Feed resistance, the switch also includes the 3rd reverser；Wherein, after the 3rd reverser is connected with the 3rd reverse input resistance with
The reverse input end connection of operational amplifier；3rd reverse feedback resistance one end is connected to the 3rd reverse input resistance and the 3rd anti-
To between switch, the second output end of the other end and operational amplifier is connected.
Wherein, the input resistance also includes the 4th reverse input resistance, and it is reversely anti-that the feedback resistance also includes the 4th
Feed resistance, the switch also includes the 4th reverser；Wherein, after the 4th reverser is connected with the 4th reverse input resistance with
The reverse input end connection of operational amplifier；4th reverse feedback resistance one end is connected to the 4th reverse input resistance and the 4th anti-
To between switch, the second output end of the other end and operational amplifier is connected.
In order to solve the above technical problems, another technical scheme that the utility model is used is：A kind of electronic installation is provided,
Including：Circuit as described above.
It is different from the situation of prior art, a kind of single-ended audio slip parallel circuit that the present embodiment is provided is in input and defeated
Go out input and feedback resistance array that end is directly accessed Multichannel Parallel, and selecting switch is built into OPA input, pass through
Switch is selected electric resistance array, realizes that the high-performance of multi-path choice and single-ended transfer difference function is combined.It is real in single-stage amplifier
Show input signal multi-path choice and difference turns single-ended two functions, greatly save area power consumption, and reduce noise.By
It is infinitely great in the input impedance low frequency of the amplifier of CMOS technology, so almost without DC current in switch, the gain of amplifier is tight
Lattice compare input resistance equal to feedback resistance so that gain is unrelated with input signal amplitude, realize good harmonic distortion and suppress
Function.While multichannel input selection is realized, multiple switch can also be opened simultaneously, realize that multichannel input is added function.
Brief description of the drawings
Fig. 1 is a kind of structural representation of single-ended audio slip parallel circuit of prior art；
Fig. 2 is the structural representation of another single-ended audio slip parallel circuit of prior art；
Fig. 3 is a kind of structural representation for single-ended audio slip parallel circuit that the utility model embodiment is provided；
Fig. 4 is the structural representation for another single-ended audio slip parallel circuit that the utility model embodiment is provided；
Fig. 5 is the structural representation for another single-ended audio slip parallel circuit that the utility model embodiment is provided.
Embodiment
For the ease of understanding the utility model, with reference to the accompanying drawings and detailed description, the utility model is carried out more
Detailed description.It should be noted that when element is expressed " being fixed on " another element, it can be directly in another element
There may be above or therebetween one or more elements placed in the middle.When an element is expressed " connection " another element, it can
To be directly to another element or there may be one or more elements placed in the middle therebetween.This specification is used
Term " vertical ", " level ", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, technology all used in this specification and scientific terminology are with belonging to skill of the present utility model
The implication that the technical staff in art field is generally understood that is identical.In art used in the description of the present utility model in this specification
Language is intended merely to describe the purpose of specific embodiment, is not intended to limit the utility model.Art used in this specification
Language "and/or" includes the arbitrary and all combination of one or more related Listed Items.
Embodiment one
A kind of single-ended audio slip parallel circuit provided refering to Fig. 3, the utility model embodiment：Including:Operational amplifier
OPA1, the branch road 12 of tie point 11 and second；Wherein, tie point 11 is by operational amplifier OPA1 input in the same direction and
One output end 13 is attached, and the second branch road 12 is connected operational amplifier OPA1 reverse input end and the second output end 14
Connect.
Tie point 11 includes：Resistance Rin11, resistance Rfb11, switch SW11 and electric capacity CP1.Resistance Rin11 and sound
Frequency input signal is connected, and switch SW11 is connected after being connected with resistance Rin11 with operational amplifier OPA1 input in the same direction.Resistance
Rfb11 one end is connected between resistance Rin11 and switch SW11, and the first output end 13 of the other end and operational amplifier OPA1 connects
Connect.Electric capacity CP1 one end is connected to operational amplifier OPA1 input in the same direction, and the other end is connected to the of operational amplifier OPA1
One output end 13.
Second branch road 12 includes：Resistance RinN1, resistance RfbN1, switch SWN1 and electric capacity CN1.Resistance RinN1 and sound
Frequency input signal is connected, and switch SWN1 is connected after being connected with resistance RinN1 with operational amplifier OPA1 reverse input end.Resistance
RfbN1 one end is connected between resistance RinN1 and switch SWN1, the second output end 121 of the other end and operational amplifier OPA1
Connection.Electric capacity CN1 one end is connected to operational amplifier OPA1 reverse input end, and the other end is connected to operational amplifier OPA1's
Second output end 14.
The present embodiment provide a kind of single-ended audio slip parallel circuit work when, closure switch SW11, then audio input believe
Number inputted after resistance Rin11 and switch SW11 from operational amplifier OPA1 input in the same direction, and from the first output end 111
Output, meanwhile, resistance Rfb11 and electric capacity CP1 constitutes feedback circuit, because electric capacity CP1 hinders big to low frequency signal, through feedback electricity
The low frequency signal of road to input is seldom.The multiplication factor of audio input signal is equal to resistance Rfb11 and resistance Rin11 ratio
Value.
Similarly, after closure switch SWN1, another audio input signal is put after resistance RinN1 and switch SWN1 from computing
Big device OPA1 reverse input end input, and from the output of the second output end, meanwhile, resistance RfbN1 and electric capacity CN1 constitutes feedback electricity
Road, because electric capacity CN1 hinders big to low frequency signal, the low frequency signal through feedback circuit to input is seldom.Audio input signal
Multiplication factor be equal to resistance RfbN1 and resistance RinN1 ratio.
Prior art is different from, a kind of single-ended audio slip parallel circuit that the present embodiment is provided is operational amplifier OPA1's
Input and output end are directly accessed input and feedback resistance, and selecting switch are built into operational amplifier OPA1 input
End.The setting of single-stage amplifier realizes input signal difference and turns single-ended two functions, has greatly saved area power consumption, and reduce
Noise.Because operational amplifier OPA1 input impedance low frequency is infinitely great, so almost without DC current in switch, amplifier
Gain compares input resistance exactly equal to feedback resistance so that gain is unrelated with input signal amplitude, realizes good harmonic wave and loses
It is true to suppress function.
Embodiment two
A kind of single-ended audio slip parallel circuit provided refering to Fig. 4, the utility model embodiment：Including:Operational amplifier
OPA2, the branch road 22 of tie point 21 and second；Wherein, tie point 21 is by operational amplifier OPA2 input in the same direction and
One output end 23 is attached, and the second branch road 22 is connected operational amplifier OPA2 reverse input end and the second output end 24
Connect.
Tie point 21 includes：The first input input of branch road 211, second branch road 212, the 3rd input branch road 213 and the
Four input branch roads 214 and electric capacity CP2.
First input branch road 211 includes：Resistance Rin21, resistance Rfb21, switch SW21.Resistance Rin21 and the first audio
Input signal is connected, and switch SW21 is connected after being connected with resistance Rin21 with operational amplifier OPA2 input in the same direction.Resistance
Rfb21 one end is connected between resistance Rin21 and switch SW21, and the first output end 23 of the other end and operational amplifier OPA2 connects
Connect.
Second input branch road 212 includes：Resistance Rin22, resistance Rfb22, switch SW22.Resistance Rin22 and the second audio
Input signal is connected, and switch SW22 is connected after being connected with resistance Rin22 with operational amplifier OPA2 input in the same direction.Resistance
Rfb22 one end is connected between resistance Rin22 and switch SW22, and the first output end 23 of the other end and operational amplifier OPA2 connects
Connect.
3rd input branch road 213 includes：Resistance Rin23, resistance Rfb23, switch SW23.Resistance Rin23 and the 3rd audio
Input signal is connected, and switch SW23 is connected after being connected with resistance Rin23 with operational amplifier OPA2 input in the same direction.Resistance
Rfb23 one end is connected between resistance Rin23 and switch SW23, and the first output end 23 of the other end and operational amplifier OPA2 connects
Connect.
4th input branch road 214 includes：Resistance Rin24, resistance Rfb24, switch SW24.Resistance Rin24 and the first audio
Input signal is connected, and switch SW24 is connected after being connected with resistance Rin24 with operational amplifier OPA2 input in the same direction.Resistance
Rfb24 one end is connected between resistance Rin24 and switch SW24, and the first output end 23 of the other end and operational amplifier OPA2 connects
Connect.
Electric capacity CP2 one end is connected to operational amplifier OPA2 input in the same direction, and the other end is connected to operational amplifier
OPA2 the first output end 23.
Second branch road 12 includes：Resistance RinN2, resistance RfbN2, switch SWN2 and electric capacity CN2.Resistance RinN2 and sound
Frequency input signal is connected, and switch SWN2 is connected after being connected with resistance RinN2 with operational amplifier OPA2 reverse input end.Resistance
RfbN2 one end is connected between resistance RinN2 and switch SWN2, and the second output end 24 of the other end and operational amplifier OPA2 connects
Connect.Electric capacity CN1 one end is connected to operational amplifier OPA2 reverse input end, and the other end is connected to the of operational amplifier OPA2
Two output ends 24.
The present embodiment provide a kind of single-ended audio slip parallel circuit work when, closure switch SW21, then audio input believe
Number inputted after resistance Rin21 and switch SW21 from operational amplifier OPA2 input in the same direction, and from the first output end 23
Output, meanwhile, resistance Rfb21 and electric capacity CP2 constitutes feedback circuit, because electric capacity CP2 hinders big to low frequency signal, through feedback electricity
The low frequency signal of road to input is seldom.The multiplication factor of audio input signal is equal to resistance Rfb21 and resistance Rin21 ratio
Value.Likewise, can each independent closure switch SW2, SW3, SW4, it is the second audio input signal, the 3rd input signal, the 4th defeated
Enter signal to input from operational amplifier OPA2 input in the same direction respectively through correspondence input branch road, and it is defeated from the first output end 23
Go out, and receive feedback signal.And it is possible to be closed at multiple switch, amplify after being added to multiple input signals.
Similarly, after closure switch SWN2, another audio input signal is put after resistance RinN2 and switch SWN2 from computing
Big device OPA2 reverse input end input, and exported from the second output end 24, meanwhile, resistance RfbN2 and electric capacity CN2, which is constituted, to be fed back
Circuit, because electric capacity CN2 hinders big to low frequency signal, the low frequency signal through feedback circuit to input is seldom.Audio input is believed
Number multiplication factor be equal to resistance RfbN2 and resistance RinN2 ratio.
Prior art is different from, a kind of single-ended audio slip parallel circuit that the present embodiment is provided is straight in input and output end
Input and the feedback resistance array of Multichannel Parallel are accessed, and selecting switch is built into OPA input, passes through switch pair
Electric resistance array is selected, and realizes that the high-performance of multi-path choice and single-ended transfer difference function is combined.Realized in single-stage amplifier defeated
Enter signal multi-path choice and difference turns single-ended two functions, greatly save area power consumption, and reduce noise.Due to CMOS
The input impedance low frequency of the amplifier of technique is infinitely great, so almost without DC current in switch, the gain of amplifier exactly equal to
Feedback resistance compares input resistance so that gain is unrelated with input signal amplitude, realizes good harmonic distortion and suppresses function.
While realizing multichannel input selection, multiple switch can also be opened simultaneously, realize that multichannel input is added function.
Embodiment three
A kind of single-ended audio slip parallel circuit provided refering to Fig. 5, the utility model embodiment：Including:Operational amplifier
OPA3, the branch road 32 of tie point 31 and second；Wherein, tie point 31 is by operational amplifier OPA3 input in the same direction and
One output end 33 is attached, and the second branch road 32 is connected operational amplifier OPA3 reverse input end and the second output end 34
Connect.
Tie point 31 includes：Resistance Rin31, resistance Rfb31, switch SW31 and electric capacity CP3.Resistance Rin31 and sound
Frequency input signal is connected, and switch SW31 is connected after being connected with resistance Rin31 with operational amplifier OPA3 input in the same direction.Resistance
Rfb31 one end is connected between resistance Rin31 and switch SW31, and the first output end 33 of the other end and operational amplifier OPA3 connects
Connect.Electric capacity CP3 one end is connected to operational amplifier OPA3 input in the same direction, and the other end is connected to the of operational amplifier OPA3
One output end 33.
Second branch road 32 includes：The first input input of branch road 311, second branch road 312, the 3rd input branch road 313 and the
Four input branch roads 314 and electric capacity CN3.
First input branch road 311 includes：Resistance RinN31, resistance RfbN31, switch SWN31.Resistance RinN31 and first
Audio input signal is connected, and switch SWN31 is connected after being connected with resistance RinN31 with operational amplifier OPA3 reverse input end.
Resistance RfbN31 one end is connected between resistance RinN31 and switch SWN31, and the second of the other end and operational amplifier OPA3 is defeated
Go out end 34 to connect.
Second input branch road 312 includes：Resistance RinN32, resistance RfbN32, switch SWN32.Resistance RinN32 and second
Audio input signal is connected, and switch SWN32 is connected after being connected with resistance RinN32 with operational amplifier OPA3 reverse input end.
Resistance RfbN32 one end is connected between resistance RinN32 and switch SWN32, and the second of the other end and operational amplifier OPA3 is defeated
Go out end 34 to connect.
3rd input branch road 313 includes：Resistance RinN33, resistance RfbN33, switch SWN33.Resistance RinN33 and the 3rd
Audio input signal is connected, and switch SWN33 is connected after being connected with resistance RinN33 with operational amplifier OPA3 reverse input end.
Resistance RfbN33 one end is connected between resistance RinN33 and switch SWN33, and the second of the other end and operational amplifier OPA3 is defeated
Go out end 34 to connect.
4th input branch road 314 includes：Resistance RinN34, resistance RfbN34, switch SWN34.Resistance RinN34 and the 4th
Audio input signal is connected, and switch SWN34 is connected after being connected with resistance RinN34 with operational amplifier OPA3 reverse input end.
Resistance RfbN34 one end is connected between resistance RinN34 and switch SWN34, and the second of the other end and operational amplifier OPA3 is defeated
Go out end 34 to connect.
Electric capacity CN3 one end is connected to operational amplifier OPA3 reverse input end, and the other end is connected to operational amplifier
OPA3 the second output end 34.
Alternatively, the resistance and switch arrays of tie point can be symmetrical with the resistance and switch arrays of the second branch road, i.e., and the
Phase in the quantity of resistance and switch in two branch roads and their annexations and tie point between operational amplifier
Together.
The present embodiment provide a kind of single-ended audio slip parallel circuit work when, closure switch SW31, then audio input believe
Number inputted after resistance Rin31 and switch SW31 from operational amplifier OPA3 input in the same direction, and from the first output end 33
Output, meanwhile, resistance Rfb31 and electric capacity CP3 constitutes feedback circuit, because electric capacity CP3 hinders big to low frequency signal, through feedback electricity
The low frequency signal of road to input is seldom.The multiplication factor of audio input signal is equal to resistance Rfb31 and resistance Rin31 ratio
Value.
Similarly, after closure switch SWN31, another audio input signal is after resistance RinN31 and switch SWN31 from fortune
Amplifier OPA3 reverse input end input is calculated, and from the output of the second output end, meanwhile, resistance RfbN31 and electric capacity CN3 is constituted
Feedback circuit, because electric capacity CN3 hinders big to low frequency signal, the low frequency signal through feedback circuit to input is seldom.Audio is defeated
The multiplication factor for entering signal is equal to resistance RfbN31 and resistance RinN31 ratio.
Likewise, can each independent closure switch SWN32, SWN33, SWN34, the second audio input signal, the 3rd input
Signal, the 4th input signal are inputted respectively through correspondence input branch road from operational amplifier OPA2 input in the same direction, and from the
Two output ends 34 are exported, and receive feedback signal.And it is possible to be closed at multiple switch, phase is carried out to multiple input signals
Plus after amplify.
Prior art is different from, a kind of single-ended audio slip parallel circuit that the present embodiment is provided is straight in input and output end
Input and the feedback resistance array of Multichannel Parallel are accessed, and selecting switch is built into OPA input, passes through switch pair
Electric resistance array is selected, and realizes that the high-performance of multi-path choice and single-ended transfer difference function is combined.Realized in single-stage amplifier defeated
Enter signal multi-path choice and difference turns single-ended two functions, greatly save area power consumption, and reduce noise.Due to CMOS
The input impedance low frequency of the amplifier of technique is infinitely great, so almost without DC current in switch, the gain of amplifier exactly equal to
Feedback resistance compares input resistance so that gain is unrelated with input signal amplitude, realizes good harmonic distortion and suppresses function.
While realizing multichannel input selection, multiple switch can also be opened simultaneously, realize that multichannel input is added function.
Example IV
The embodiment of the present application three provides a kind of electronic installation, comprising in above-mentioned implementation one, embodiment two and embodiment three
A kind of described single-ended audio slip parallel circuit.
The electronic equipment of the present embodiment exists in a variety of forms, includes but is not limited to:
(1) mobile communication equipment:The characteristics of this kind equipment is that possess mobile communication function, and to provide speech, data
Communicate as main target.This Terminal Type includes:Smart mobile phone (such as iPhone), multimedia handset, feature mobile phone, and it is low
Hold mobile phone etc..
(2) super mobile personal computer equipment:This kind equipment belongs to the category of personal computer, there is calculating and processing work(
Can, typically also possess mobile Internet access characteristic.This Terminal Type includes:PDA, MID and UMPC equipment etc., such as iPad.
(3) portable entertainment device:This kind equipment can show and play content of multimedia.The kind equipment includes:Audio,
Video player (such as iPod), handheld device, e-book, and intelligent toy and portable car-mounted navigation equipment.
(4) other electronic installations for playing audio, sound or sounding.
It is above-mentioned to be built-in with a kind of electronic device functions of single-ended audio slip parallel circuit by taking the circuit in embodiment two as an example
When, closure switch SW21, then audio input signal after resistance Rin21 and switch SW21 from the in the same direction of operational amplifier OPA2
Input is inputted, and is exported from the first output end 23, meanwhile, resistance Rfb21 and electric capacity CP2 constitutes feedback circuit, due to electric capacity
CP2 hinders big to low frequency signal, and the low frequency signal through feedback circuit to input is seldom.Multiplication factor of audio input signal etc.
In resistance Rfb21 and resistance Rin21 ratio.Likewise, can each independent closure switch SW2, SW3, SW4, the second audio is defeated
Enter signal, the 3rd input signal, the 4th input signal and input branch road from the in the same direction defeated of operational amplifier OPA2 respectively through correspondence
Enter end input, and exported from the first output end 23, and receive feedback signal.And it is possible to multiple switch is closed at, to multiple
Input signal is amplified after being added.
Similarly, after closure switch SWN2, another audio input signal is put after resistance RinN2 and switch SWN2 from computing
Big device OPA2 reverse input end input, and exported from the second output end 24, meanwhile, resistance RfbN2 and electric capacity CN2, which is constituted, to be fed back
Circuit, because electric capacity CN2 hinders big to low frequency signal, the low frequency signal through feedback circuit to input is seldom.Audio input is believed
Number multiplication factor be equal to resistance RfbN2 and resistance RinN2 ratio.
Prior art is different from, a kind of electronic equipment of single-ended audio slip parallel circuit that is built-in with that the present embodiment is provided exists
Input and output end are directly accessed input and the feedback resistance array of Multichannel Parallel, and selecting switch is built into OPA's
Input, is selected electric resistance array by switching, and realizes that the high-performance of multi-path choice and single-ended transfer difference function is combined.
Single-stage amplifier realizes input signal multi-path choice and difference turns single-ended two functions, has greatly saved area power consumption, and drop
Low noise.Because the input impedance low frequency of the amplifier of CMOS technology is infinitely great, so almost without DC current, fortune in switch
The gain put compares input resistance exactly equal to feedback resistance so that gain is unrelated with input signal amplitude, realizes good humorous
Wave distortion suppresses function.While multichannel input selection is realized, multiple switch can also be opened simultaneously, realizes that multichannel inputs phase
Plus function.
Of the present utility model preferably implement it should be noted that being given in specification of the present utility model and its accompanying drawing
Mode, still, the utility model can be realized by many different forms, however it is not limited to the implementation described by this specification
Mode, these embodiments are to make there is provided the purpose of these embodiments not as the extra limitation to the utility model content
Understanding to disclosure of the present utility model is more thorough comprehensive.Also, above-mentioned each technical characteristic continues to be mutually combined, formed
The various embodiments not being enumerated above, are accordingly to be regarded as the scope of the utility model specification record；Further, to this area
For those of ordinary skill, it can according to the above description be improved or be converted, and all these modifications and variations should all belong to
The protection domain of the utility model appended claims.
Claims (10)
1. a kind of single-ended audio slip parallel circuit, it is characterised in that including：Operational amplifier, input resistance, feedback resistance, open
Close and electric capacity；Wherein, switch is connected after being connected with input resistance with the input of operational amplifier；Feedback resistance one end is connected
Between input resistance and switch, the output end connection of the other end and operational amplifier；Electric capacity one end is connected to operational amplifier
Input, the other end is connected to the output end of main body operational amplifier.
2. circuit according to claim 1, it is characterised in that the input resistance includes the first input resistance in the same direction, institute
Stating feedback resistance includes the first feedback resistance in the same direction, and the switch includes first and switched in the same direction, and it is in the same direction that the electric capacity includes first
Electric capacity；Wherein, the first switch in the same direction is connected after being connected with the first input resistance in the same direction with the input in the same direction of operational amplifier；The
One feedback resistance one end in the same direction is connected between the first input resistance in the same direction and the first switch in the same direction, the other end and operational amplifier
The first output end connection；First electric capacity one end in the same direction is connected to the input in the same direction of operational amplifier, and the other end is connected to master
First output end of body operational amplifier.
3. circuit according to claim 1, it is characterised in that the input resistance also includes the first reverse input resistance,
The feedback resistance also includes the first reverse feedback resistance, and the switch also includes the first reverser, and the electric capacity also includes
First reciprocal capacitance；Wherein, with the reverse input of operational amplifier after the first reverser is connected with the first reverse input resistance
End connection；First reverse feedback resistance one end is connected between the first reverse input resistance and the first reverser, the other end with
The second output end connection of operational amplifier；Second reciprocal capacitance one end is connected to the reverse input end of operational amplifier, another
End is connected to the second output end of main body operational amplifier.
4. the circuit according to Claims 2 or 3, it is characterised in that the input resistance also includes second and inputs electricity in the same direction
Resistance, the feedback resistance, which also includes the second feedback resistance in the same direction, the switch, also includes the second switch in the same direction；Wherein, second is same
It is connected after being connected to switch with the second input resistance in the same direction with the input in the same direction of operational amplifier；Second feedback resistance one in the same direction
End is connected between the second input resistance in the same direction and the second switch in the same direction, and the first output end of the other end and operational amplifier connects
Connect.
5. circuit according to claim 4, it is characterised in that the input resistance also includes the 3rd input resistance in the same direction,
The feedback resistance also includes the 3rd feedback resistance in the same direction, and the switch also includes the 3rd and switched in the same direction；Wherein, the 3rd open in the same direction
Pass is connected after being connected with the 3rd input resistance in the same direction with the input in the same direction of operational amplifier；3rd feedback resistance one end in the same direction connects
It is connected between the 3rd input resistance in the same direction and the 3rd switch in the same direction, the first output end connection of the other end and operational amplifier.
6. circuit according to claim 5, it is characterised in that the input resistance also includes the 4th input resistance in the same direction,
The feedback resistance also includes the 4th feedback resistance in the same direction, and the switch also includes the 4th and switched in the same direction；Wherein, the 4th open in the same direction
Pass is connected after being connected with the 4th input resistance in the same direction with the input in the same direction of operational amplifier；4th feedback resistance one end in the same direction connects
It is connected between the 4th input resistance in the same direction and the 4th switch in the same direction, the first output end connection of the other end and operational amplifier.
7. the circuit according to Claims 2 or 3, it is characterised in that the input resistance also includes second and reversely inputs electricity
Resistance, the feedback resistance also includes the second reverse feedback resistance, and the switch also includes the second reverser；Wherein, second is anti-
It is connected after being connected to switch with the second reverse input resistance with the reverse input end of operational amplifier；Second reverse feedback resistance one
End is connected between the second reverse input resistance and the second reverser, and the second output end of the other end and operational amplifier connects
Connect.
8. circuit according to claim 7, it is characterised in that the input resistance also includes the 3rd reverse input resistance,
The feedback resistance also includes the 3rd reverse feedback resistance, and the switch also includes the 3rd reverser；Wherein, the 3rd reversely open
Pass is connected after being connected with the 3rd reverse input resistance with the reverse input end of operational amplifier；3rd reverse feedback resistance one end connects
It is connected between the 3rd reverse input resistance and the 3rd reverser, the second output end connection of the other end and operational amplifier.
9. circuit according to claim 8, it is characterised in that the input resistance also includes the 4th reverse input resistance,
The feedback resistance also includes the 4th reverse feedback resistance, and the switch also includes the 4th reverser；Wherein, the 4th reversely open
Pass is connected after being connected with the 4th reverse input resistance with the reverse input end of operational amplifier；4th reverse feedback resistance one end connects
It is connected between the 4th reverse input resistance and the 4th reverser, the second output end connection of the other end and operational amplifier.
10. a kind of electronic installation, it is characterised in that including：Circuit described in claim any one of 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720308655.4U CN206595966U (en) | 2017-03-27 | 2017-03-27 | A kind of single-ended audio slip parallel circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720308655.4U CN206595966U (en) | 2017-03-27 | 2017-03-27 | A kind of single-ended audio slip parallel circuit |
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| CN206595966U true CN206595966U (en) | 2017-10-27 |
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| CN201720308655.4U Active CN206595966U (en) | 2017-03-27 | 2017-03-27 | A kind of single-ended audio slip parallel circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111787249A (en) * | 2020-07-15 | 2020-10-16 | 江苏尚飞光电科技股份有限公司 | 32-channel charge acquisition and readout circuit and control method thereof |
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2017
- 2017-03-27 CN CN201720308655.4U patent/CN206595966U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111787249A (en) * | 2020-07-15 | 2020-10-16 | 江苏尚飞光电科技股份有限公司 | 32-channel charge acquisition and readout circuit and control method thereof |
| CN111787249B (en) * | 2020-07-15 | 2024-01-09 | 江苏尚飞光电科技股份有限公司 | 32-channel charge acquisition and readout circuit and control method thereof |
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Effective date of registration: 20220414 Address after: Rooms 1306-1309, 13 / F, 19 science Avenue West, Hong Kong Science Park, Shatin, New Territories, China Patentee after: BUILDWIN INTERNATIONAL (ZHUHAI) LTD. Address before: 3 / F (axis 7-13), stereo science and technology building, 184 Bailian Road, Jida, Zhuhai, Guangdong 519000 Patentee before: BUILDWIN INTERNATIONAL (ZHUHAI) Ltd. |