CN109831167A - A kind of preamplifier circuit and chip - Google Patents
A kind of preamplifier circuit and chip Download PDFInfo
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- CN109831167A CN109831167A CN201910045599.3A CN201910045599A CN109831167A CN 109831167 A CN109831167 A CN 109831167A CN 201910045599 A CN201910045599 A CN 201910045599A CN 109831167 A CN109831167 A CN 109831167A
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Abstract
The present invention discloses a kind of preamplifier circuit, circuit integration portion in the chip, including the voltage bias module and differential amplification module to link together, the non-inverting input terminal and inverting input terminal of the differential amplification module are connected separately with pad node M ICIN_P and node M ICIP_P, the voltage bias module includes amplifier OP3, resistance RA and resistance RB, the non-inverting input terminal input offset voltage of amplifier OP3, output end is connect by the first feedback network FB with inverting input terminal, output end is also connect by switch SA and switch SB with one end of one end of resistance RA and resistance RB respectively, the other end of resistance RA and the other end of resistance RB are connect with node M ICIN_P and node M ICIP_P respectively, the output end of amplifier OP3 also pass through switch SE with Node M ICIN_P connection.The present invention can be completed chip internal circuits cooperation external circuit only with an amplifier and realize Differential Input and single ended input switching control, be conducive to the production cost for saving chip.
Description
Technical field
The present invention relates to Audio Signal Processing chip technology fields, and in particular to a kind of preamplifier circuit and chip.
Background technique
With the continuous development of SOC (system on chip) chip technology, previous multiple chips concentration is welded on one piece of pcb board
Method increasingly fall behind, the trend of miniaturization of electronic products requires the size of pcb board the smaller the better, and system on chip can solve
The functional circuit of multiple chips is integrated on a chips by this problem under the premise of not reducing circuit performance.It is such
Way is very popular, but the scheme scene of task and application that a chips are undertaken is more and more, product it is small-sized
Change be further desirable to SOC chip itself volume it is preferably also smaller and smaller, the thus contradiction of bring chip design: task and answer
With enriching so that the pin number of SOC chip is more and more, because the peripheral hardware that can be driven and connect in this way can be more for scheme
It is more, but chip pin quantity is unable to infinite extension.Pin number can be made more in spite of some Advanced Packaging modes, but
Be it is advanced encapsulation themselves such that chip cost increase.More economical more preferably way should be the cheap mature envelope of use cost
The bare chip combination of dress mode and function complexity.In face of numerous schemes, by by the unlike signal pad on bare chip
It is bonded on the pin of encapsulation optionally through binding line and is connected with other components on PCB, same core may be implemented in this way
Piece is applied to kinds of schemes, and signal pad corresponding to the chip functions used is not needed in scheme and does not have to be connected to packaging pin
On.
Many electronic multimedia products all have sound-recording function now, and sound-recording function increasingly moves towards intelligent, more
It more emphasizes human-computer interaction and artificial intelligence, please refers to Fig. 1, existing voice man-machine interactive system includes being integrated in SOC chip
Internal and sequentially connected preamplifier circuit PREAMP, analog-digital converter circuit ADC and digital signal processing circuit DSP
And the microphone acoustic-electric conversion circuit 4 of chip exterior is set.Voice signal is converted into electric signal by microphone and is sent to core
Inside piece, the usual amplitude of oscillation very little of electric signal of microphone output is unfavorable for the analog-to-digital conversion of signal, therefore preamplifier is arranged
Circuit PREAMP is finally used for being converted into digital signal by analog-digital converter circuit ADC again after amplifying certain multiple in advance
Digital signal processing circuit DSP carries out operation and processing to digital signal.
Referring to figure 2., the mode of microphone applications circuit includes: that single ended input mode, Differential Input mode and mixing are defeated
Enter mode, wherein resistance R1 and resistance R2 is load resistance, and capacitor C1 and capacitor C2 are capacitance.Microphone MIC turns
The voltage signal come that swaps out will be ac-coupled to chip interior by capacitance.When practical application, according to recording performance
It is different and use different modes, there is flexibility in order to make chip more, the above-mentioned Three models of the recording circuit in SOC.
Referring to figure 3. and Fig. 4, identical chip dies are met into different product side by different encapsulation wiring modes
The application of case.Chip package pin MICIP and chip package pin MICIN chip be welded on PCB after and PCB on other
Component keeps electrical connection.Binding line (Bonding Wire) WP and binding line WN is for guaranteeing packaging pin and chip dies
The electrical connection of upper corresponding pad.Node M ICIP_P and node M ICIN_P is the pad on chip dies, and naked with chip
3 part of nodes of internal circuit of piece is connected, and the internal circuit 3 of chip and extraneous electrical connection and signal transmitting are exactly to pass through weldering
What disk, binding line and packaging pin were realized.
Referring to figure 2. and Fig. 3, under Differential Input mode, differential signal is sent to pin MICIP by microphone circuit respectively
With pin MICIN, pad MICIP_P and pad MICIN_P are then coupled to by binding line WP and binding line W.It enables at this time
Amplifier OP1 closes amplifier OP2, closure switch SA and switch SB.Amplifier OP1 is a unity gain buffer in form, is led to
It crosses resistance RA and resistance RB and provides bias voltage VCM for node M ICIP_P and node M ICIN_P, make resistance RC, resistance RD, electricity
Resistance RE, resistance RF and amplifier OPFD are biased in normal working range.External microphone acoustic-electric conversion circuit 4 converts acoustic-electric
Ac signal V (MICIP_P-MICIN_P) afterwards is coupled to chip interior and the preamplifier circuit by microphone
Then differential signal MICOUTP and differential signal MICOUTN are sent to analog-digital converter circuit ADC and carried out by PREAMP amplification
Analog-to-digital conversion.Referring to figure 2. and Fig. 4, under single ended input mode, microphone acoustic-electric conversion circuit 4 by pin MICIP with
Chip connection.Amplifier OP1 is closed at this time, and switch SA and switch SB are disconnected, and amplifier OP2 is enabled and is configured as Unity-gain buffer
Device keeps resistance RC, resistance RD, resistance RE, resistance RF and amplifier OPFD inclined for providing bias voltage VCM for node M ICIN_P
It sets in normal working range, ac signal V (MICIP_P-VCM) is amplified to be transmitted to analog-digital converter circuit ADC.
Although the chip of the prior art can be compatible with Differential Input mode and single ended input multimode microphone circuit, need
Use two amplifiers, in different modes by modify chip configuration register come control two amplifiers respectively enable and
Switch folding.This circuit design mode seems not economical enough.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of preamplifier circuit, for solving existing audio letter
Not simple enough, the at high cost problem of structure of number processing chip.
The contents of the present invention are as follows:
A kind of preamplifier circuit, circuit integration portion in the chip, including the voltage bias module to link together
With differential amplification module, the non-inverting input terminal and inverting input terminal of the differential amplification module are connected separately with pad node
MICIN_P and node M ICIP_P, the voltage bias module include amplifier OP3, resistance RA and resistance RB, the same phase of amplifier OP3
Input terminal input offset voltage, output end are connect by the first feedback network FB with inverting input terminal, and output end also passes through respectively
Switch SA and switch SB are connect with one end of one end of resistance RA and resistance RB, the other end of resistance RA and the other end of resistance RB
It is connect respectively with node M ICIN_P and node M ICIP_P, the output end of amplifier OP3 also passes through switch SE and node M ICIN_P and connects
It connects.
Preferably, the first feedback network FB is shorted, and the output end of the amplifier OP3 is connect with inverting input terminal.
Preferably, the first feedback network FB includes switch SC, and one end of switch SC and the output end of amplifier OP3 connect
It connects, the other end is connect with the inverting input terminal of amplifier OP3, and it is defeated with reverse phase that the output end of amplifier OP3 also passes through the second feedback network
Enter end connection, the second feedback network includes the switch SE and switch SD, one end of switch SD and the inverting input terminal of amplifier OP3
Connection, the other end are connect with node M ICIN_P.
Preferably, the differential amplification module includes amplifier OPFD and resistance RC, resistance RD, resistance RE and resistance RF,
The non-inverting input terminal of amplifier OPFD is connect by resistance RE with node M ICIN_P, and the inverting input terminal of amplifier OPFD passes through resistance
RD is connect with node M ICIP_P, and the reversed-phase output of amplifier OPFD is connect by resistance RF with non-inverting input terminal, amplifier OPFD's
In-phase output end is connect by resistance RD with inverting input terminal.
Preferably, the resistance value of the resistance RA and the resistance RB are equal, the resistance value of the resistance RC and the resistance RE
Equal, the resistance value of the resistance RD and the resistance RF are equal.
The present invention also provides a kind of chips, including above-mentioned preamplifier circuit, analog-digital converter circuit and number letter
Number processing circuit, preamplifier circuit, analog-digital converter circuit and digital signal processing circuit are sequentially connected.
The invention has the benefit that chip internal circuits cooperation external electrical can be completed only with an amplifier in the present invention
Differential Input and single ended input switching control are realized in road, are conducive to the production cost for saving chip.
Detailed description of the invention
Fig. 1 show existing audio frequency processing circuit functional block diagram；
Fig. 2 show existing microphone applications circuit diagram；
Fig. 3 show the chip interior schematic diagram under existing Differential Input mode；
Fig. 4 show the chip interior schematic diagram under existing single ended input mode；
Fig. 5 show circuit theory Fig. 1 of the invention；
Fig. 6 show the chip circuit schematic diagram under 1 Differential Input mode of the embodiment of the present invention；
Fig. 7 show the chip circuit schematic diagram under 1 single ended input mode of the embodiment of the present invention；
Fig. 8 show the chip circuit schematic diagram under 2 Differential Input mode of the embodiment of the present invention；
Fig. 9 show the chip circuit schematic diagram under 2 single ended input mode of the embodiment of the present invention；
Figure 10 show the chip equivalent circuit schematic under 2 Differential Input mode of the embodiment of the present invention；
Figure 11 show the waveform diagram of the input signal under 2 Differential Input mode of the embodiment of the present invention；
Figure 12 show the waveform diagram of the output signal under 2 Differential Input mode of the embodiment of the present invention；
Figure 13 show the chip equivalent circuit schematic under 2 single ended input mode of the embodiment of the present invention；
Figure 14 show the waveform diagram of the input signal under 2 single ended input mode of the embodiment of the present invention；
Figure 15 show the waveform diagram of the output signal under 2 single ended input mode of the embodiment of the present invention；
Figure 16 show the switching circuit schematic diagram of the embodiment of the present invention 2；
Figure 17 show the switch resistance R of the embodiment of the present invention 2ONWith source S or drain D voltage change curve；
Figure 18 show the circuit diagram of the feedback control loop of 2 amplifier OP3 of the embodiment of the present invention；
Figure 19 show a kind of equivalent circuit diagram of Fig. 9；
Figure 20 show a kind of equivalent circuit diagram that mismatch condition is not present in Fig. 9.
Specific embodiment
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Referring to figure 5., a kind of preamplifier circuit disclosed in the present embodiment, circuit integration portion in the chip, including
The voltage bias module 1 and differential amplification module 2 to link together, the non-inverting input terminal and anti-phase input of differential amplification module 2
End is connected separately with pad node M ICIN_P and node M ICIP_P, and voltage bias module 1 includes amplifier OP3, resistance RA and electricity
RB, the non-inverting input terminal input offset voltage of amplifier OP3 are hindered, output end is connected by the first feedback network FB and inverting input terminal
It connects, output end is also connect by switch SA and switch SB with one end of one end of resistance RA and resistance RB respectively, and resistance RA's is another
The other end of one end and resistance RB are connect with node M ICIN_P and node M ICIP_P respectively, and the output end of amplifier OP3 also passes through
Switch SE is connect with node M ICIN_P.
Differential amplification module includes amplifier OPFD and resistance RC, resistance RD, resistance RE and resistance RF, and amplifier OPFD's is same
Phase input terminal is connect by resistance RE with node M ICIN_P, and the inverting input terminal of amplifier OPFD passes through resistance RD and node
The reversed-phase output of MICIP_P connection, amplifier OPFD is connect by resistance RF with non-inverting input terminal, the same phase output of amplifier OPFD
End is connect by resistance RD with inverting input terminal.In order to guarantee symmetry to eliminate even-order harmonic distortion, electricity is arranged in the present invention
The resistance value for hindering RA and resistance RB is equal, and the resistance value of resistance RC and resistance RE are equal, and the resistance value of resistance RD and resistance RF are equal.
The gain of preamplifier is equal to
The working principle of the invention is described in detail with embodiment 1 and embodiment 2 individually below,
Embodiment 1:
Fig. 6 and Fig. 7 are please referred to, in the present embodiment, the first feedback network FB is shorted, i.e. the output end of amplifier OP3 and anti-
The connection of phase input terminal, amplifier OP3 are configured to unity gain buffer.The present embodiment also provides a kind of chip, including this implementation
Preamplifier circuit, analog-digital converter circuit ADC and digital signal processing circuit DSP described in example, preamplifier circuit
PREAMP, analog-digital converter circuit ADC and digital signal processing circuit DSP are sequentially connected.
Referring to figure 2., Fig. 6 and Fig. 7, in Differential Input mode in application, enabled amplifier OP3, closure switch SA and switch
SB disconnects SE.In single ended input mode in application, enabled amplifier OP3, closure switch SE, disconnect switch SA and switch SB.This reality
Applying example although may be implemented the single ended input mode and Differential Input mode of the compatible microphone acoustic-electric conversion circuit of single amplifier, but
Single ended input mode in application, switch SE is on signal path, impedance with end-point voltage nonlinear change characteristic meeting
Deteriorate the linearity of preamplifier circuit.In addition, the nonzero value of switch SE is equivalent so that resistance RE impedance is made greater than resistance RC
At the asymmetry of difference amplifier, can even-order harmonic be increased, can equally bring the deterioration of the linearity, the present invention mentions thus
The technical solution of embodiment 2 is supplied.
Embodiment 2:
Fig. 8 and Fig. 9 are please referred to, the first feedback network FB includes switch SC, one end of switch SC and the output end of amplifier OP3
Connection, the other end are connect with the inverting input terminal of amplifier OP3, and the output end of amplifier OP3 also passes through the second feedback network and reverse phase
Input terminal connection, the second feedback network include switch SE and switch SD, and one end of switch SD and the inverting input terminal of amplifier OP3 connect
It connects, the other end is connect with node M ICIN_P.A kind of chip provided in this embodiment, including preposition amplification described in the present embodiment
Device circuit PREAMP, analog-digital converter circuit ADC and digital signal processing circuit DSP, preamplifier circuit PREAMP, modulus
Converter circuit ADC and digital signal processing circuit DSP are sequentially connected.
Referring to figure 2. and Fig. 8, in Differential Input mode in application, amplifier OP3 is enabled and is configured to Unity-gain buffer
Device, for providing bias voltage VCM for node M ICIP_P and node M ICIN_P, bias voltage VCM guarantees preamplifier electricity
Road PREAMP is in normal operation region, and closure switch SC, switch SA and switch SB disconnect switch SD and switch SE, at this time
Equivalent circuit please refers to Figure 10.
The function formula that preamplifier is realized:
Please refer to Figure 11, Figure 11 show the defeated of in the application of Differential Input mode node MICIP_P and node M ICIN_P
Enter signal waveform.It is defeated that the input signal of node M ICIP_P and node M ICIN_P obtain difference after amplifier OPFD subtracts each other amplification
Signal MICOUTP and differential output signal MICOUTN out, please refers to Figure 12, Figure 12 show differential output signal MICOUTP and
The waveform diagram of differential output signal MICOUTN.Generally in order to which the dynamic range of signals for guaranteeing each node of circuit is maximum, VCM is general
Take 1/2 supply voltage.
Referring to figure 2. and Fig. 9, in single ended input mode in application, external microphone acoustic-electric conversion circuit only passes through one
A pin is connect with chip, enables amplifier OP3 at this time and amplifier OP3 is configured to unity gain buffer, for being node
MICIN_P provides bias voltage VCM, closure switch SD and switch SE, disconnects switch SC, switch SA and switch SB, at this time etc.
Effect circuit please refers to Figure 13.
The function formula that preamplifier is realized:
Please refer to Figure 14, Figure 14 show the defeated of in the application of single ended input mode node MICIP_P and node M ICIN_P
Enter signal waveform.It is defeated that the input signal of node M ICIP_P and node M ICIN_P obtain difference after amplifier OPFD subtracts each other amplification
Signal MICOUTP and differential output signal MICOUTN out, please refers to Figure 15, Figure 15 show differential output signal MICOUTP and
The waveform diagram of differential output signal MICOUTN.
Figure 16-18 is please referred to, since the switch in chip integrated circuit is usually to be realized with MOS transistor, single-ended defeated
Configuration mode when entering mode application is that switch SD and switch SE is placed on inside the loop of unity gain buffer, such
Configuration mode advantageously ensures that low distortion.
Figure 16 is please referred to, the switch in chip integrated circuit generally comprises p-type metal-oxide-semiconductor MP and N-type metal-oxide-semiconductor MN, metal-oxide-semiconductor MP
Source electrode and drain electrode connect respectively with the source electrode and drain electrode of metal-oxide-semiconductor MN, the base stage of metal-oxide-semiconductor MN is for receiving digital signal EN, number
Word signal EN is connect by phase inverter INV with the base stage of metal-oxide-semiconductor MP, and the disconnection of switch and closure are controlled by digital signal EN, when
When digital signal EN is high level, the grid of metal-oxide-semiconductor MN is high level, and digital signal EN passes through defeated after phase inverter INV reverse phase
Low level out is coupled to the grid of metal-oxide-semiconductor MP, and metal-oxide-semiconductor MN and metal-oxide-semiconductor MP are simultaneously turned at this time, between source S and drain D
Impedance is very small, can be considered and closes the switch.When digital signal EN is low level, the grid of metal-oxide-semiconductor MN is low level, metal-oxide-semiconductor
The grid of MP is the high level after digital signal EN reverse phase, therefore metal-oxide-semiconductor MN and metal-oxide-semiconductor MP end simultaneously, source S and leakage at this time
Impedance between the D of pole is very high, can be considered that switch disconnects.
Please referring to Figure 17, Figure 17 show the switch resistance RON of embodiment 2 with source S or drain D voltage change curve,
The switch on-resistance being made of metal-oxide-semiconductor is very high non-linear with end-point voltage variation presentation, and what ideal linearity switched leads
Logical impedance should be the very low horizontal linear of an impedance value with end-point voltage change curve.If this switch application is in amplification electricity
On the signal path on road, apparent non-linear distortion will be generated to amplifier output signal.
Figure 18 is please referred to, in order to solve the problems, such as switch non-linearity, in single ended input mode in application, switch SD and SE are arranged
Inside the loop of unity gain buffer, the non-linear feedback loop by buffer itself of switch inhibits, work
Principle is as follows:
Can generally there be centainly non-linear in the circuit system of reality, it is nonlinear to take the form of input/output relation
And off-gauge linear function form, such as y=ax+b, but have secondary or above nonlinear terms, such as:
Y=a1x+a2x2+a3x3+...+anxn。
If ignoring high-order term, only the first three items of negated linear relationship, obtain y=a1x+a2x2+a3x3.If input signal
It is in the time domain normalized standard cosine signal x=cos (ω t), wherein ω is angular frequency, and t is the time, then output signal
Time-domain expression be y1=a1·cos(ωt)+a2·cos2(ωt)+a3·cos3(ωt) (1)
It can be converted the output into using the double angle formula of trigonometric function
It can be seen that the presence of the quadratic term and cubic term come in formula (1) directly result in it is nonlinear in formula (2)
Second harmonic ingredient and triple-frequency harmonics ingredient.A fully differential system if it exists, it is complete poor that the standard cosine signal is input to this
One input terminal of subsystem, another signal x=-cos identical as the amplitude of the standard cosine signal, opposite in phase
(ω t) is input to another input terminal in the fully differential system, then the time-domain expression of output signal is
y2=-a1·cos(ωt)+a2·cos2(ωt)-a3·cos3(ωt) (3)
Two output signals subtract each other to obtain differential signal
yd=y1-y2=2a1·cos(ωt)+2a3·cos3(ωt) (4)
From formula (3) and formula (4) it can be found that quadratic term is subtracted in the differential signal of output, therefore even-order harmonic
It disappears at branch, the distortion factor of entire fully differential system reduces.
For traditional technology, the advantage of the invention is that the Differential Input mould of compatible microphone acoustic-electric conversion circuit
Formula and single ended input mode, it is only necessary to which the Differential Input mode of chip internal circuits cooperation external circuit can be completed in an amplifier
With the switching control of single ended input mode, be conducive to the cost for saving chip.The distortion factor of chip is without using one because reducing
A amplifier and lost, can satisfy the performance requirement of chip.
Fig. 7 and Figure 19 are please referred to, when chip is configured to single ended input, external signal is ac-coupled to chip envelope
Pin MICIP is filled, chip package pin MICIN is hanging, and the general resistance value that resistance RC and resistance RE is arranged is equal, resistance RD and electricity
The resistance value for hindering RF is equal, it is contemplated that switch SE is closed bring switch conduction Resistance Influence, and the circuit equivalent of Fig. 7 is figure at this time
19.If containing the conducting resistance of switch SE on the input path of input signal VIN, the coefficient meeting in formula (1) and (3)
There are mismatches.I.e. two outputs are respectively
y1=a1·cos(ωt)+a2·cos2(ωt)+a3·cos3(ωt) (5)
y2=-a '1·cos(ωt)+a′2·cos2(ωt)-a′3·cos3(ωt) (6)
Output after the two calculus of differences is
yd=y1-y2=(a1+a′1)·cos(ωt)+(a2-a'2)·cos2(ωt)+(a3+a'3)·cos3(ωt) (7)
For the distortion factor, formula (7) essentially consists in quadratic term relative to formula (4) and is not eliminated by perfection, the mistake of circuit
With the presence for resulting in even-order harmonic, the distortion factor is deteriorated.
Figure 18 and Figure 20 are please referred to, switch SD and SE are arranged in inside the loop of unity gain buffer, node M ICIN_P
Input voltage can accurately follow voltage VCM, at this point, the circuit equivalent of Figure 19 be Figure 20 in circuit.When circuit design, make electricity
The resistance value for hindering RC and resistance RE is equal, and the resistance value of resistance RD and resistance RF are equal, the difference output letter that circuit shown in Figure 20 obtains
Number meet formula (4), quadratic term is eliminated by perfection, does not have even-order harmonic ingredient then, circuit linearity degree is guaranteed.
For traditional technology, the advantage of the invention is that the Differential Input mould of compatible microphone acoustic-electric conversion circuit
Formula and single ended input mode, it is only necessary to which the Differential Input mode of chip internal circuits cooperation external circuit can be completed in an amplifier
With the switching control of single ended input mode, be conducive to the cost for saving chip.The distortion factor of chip is without using one because reducing
A amplifier and lost, can satisfy the performance requirement of chip.
The above, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as
It reaches technical effect of the invention with identical means, all should belong to protection scope of the present invention.In protection model of the invention
Its technical solution and/or embodiment can have a variety of different modifications and variations in enclosing.
Claims (6)
1. a kind of preamplifier circuit, circuit integration portion in the chip, including the voltage bias module (1) to link together
With differential amplification module (2), the non-inverting input terminal and inverting input terminal of the differential amplification module (2) are connected separately with pad section
Point MICIN_P and node M ICIP_P, it is characterised in that: the voltage bias module (1) includes amplifier OP3, resistance RA and resistance
The non-inverting input terminal input offset voltage of RB, amplifier OP3, output end are connect by the first feedback network FB with inverting input terminal,
Output end is also connect by switch SA and switch SB with one end of one end of resistance RA and resistance RB respectively, the other end of resistance RA
It is connect respectively with node M ICIN_P and node M ICIP_P with the other end of resistance RB, the output end of amplifier OP3 also passes through switch
SE is connect with node M ICIN_P.
2. preamplifier circuit as described in claim 1, it is characterised in that: the first feedback network FB is shorted, described
The output end of amplifier OP3 is connect with inverting input terminal.
3. preamplifier circuit as described in claim 1, it is characterised in that: the first feedback network FB includes switch
One end of SC, switch SC are connect with the output end of amplifier OP3, and the other end is connect with the inverting input terminal of amplifier OP3, amplifier OP3
Output end also pass through the second feedback network and connect with inverting input terminal, the second feedback network includes the switch SE and switch
One end of SD, switch SD are connect with the inverting input terminal of amplifier OP3, and the other end is connect with node M ICIN_P.
4. preamplifier circuit as described in claim 1, it is characterised in that: the differential amplification module (2) includes amplifier
The non-inverting input terminal of OPFD and resistance RC, resistance RD, resistance RE and resistance RF, amplifier OPFD pass through resistance RE and node
The inverting input terminal of MICIN_P connection, amplifier OPFD is connect by resistance RD with node M ICIP_P, and the reverse phase of amplifier OPFD is defeated
Outlet is connect by resistance RF with non-inverting input terminal, and the in-phase output end of amplifier OPFD is connected by resistance RD and inverting input terminal
It connects.
5. preamplifier circuit as claimed in claim 4, it is characterised in that: the resistance value of the resistance RA and the resistance RB
Equal, the resistance value of the resistance RC and the resistance RE are equal, and the resistance value of the resistance RD and the resistance RF are equal.
6. a kind of chip, it is characterised in that: including preamplifier circuit, the modulus as described in claim 1-5 any one
Converter circuit and digital signal processing circuit, preamplifier circuit, analog-digital converter circuit and digital signal processing circuit
It is sequentially connected.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110290447A (en) * | 2019-07-05 | 2019-09-27 | 深圳市中科蓝讯科技有限公司 | Direct current biasing unit, microphone works circuit and microphone control chip |
| CN114125615A (en) * | 2022-01-25 | 2022-03-01 | 湖北芯擎科技有限公司 | Vehicle-mounted interface data processing system and method and vehicle-mounted equipment |
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| CN114125615B (en) * | 2022-01-25 | 2022-05-03 | 湖北芯擎科技有限公司 | Vehicle-mounted interface data processing system and method and vehicle-mounted equipment |
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