CN102026062B - Integrated circuit, method and chip for microphone signal preamplification as well as electronic equipment - Google Patents

Integrated circuit, method and chip for microphone signal preamplification as well as electronic equipment Download PDF

Info

Publication number
CN102026062B
CN102026062B CN201010240618.7A CN201010240618A CN102026062B CN 102026062 B CN102026062 B CN 102026062B CN 201010240618 A CN201010240618 A CN 201010240618A CN 102026062 B CN102026062 B CN 102026062B
Authority
CN
China
Prior art keywords
signal
current
microphone
maladjustment
current sample
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201010240618.7A
Other languages
Chinese (zh)
Other versions
CN102026062A (en
Inventor
吕连国
熊江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Actions Technology Co Ltd
Original Assignee
Actions Semiconductor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Actions Semiconductor Co Ltd filed Critical Actions Semiconductor Co Ltd
Priority to CN201010240618.7A priority Critical patent/CN102026062B/en
Publication of CN102026062A publication Critical patent/CN102026062A/en
Application granted granted Critical
Publication of CN102026062B publication Critical patent/CN102026062B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Amplifiers (AREA)

Abstract

The invention discloses an integrated circuit (IC), a method and a chip for microphone signal preamplification as well as electronic equipment, belonging to electronic circuits. In the invention, a microphone is directly connected with a microphone input pin of the IC. The current of a microphone input signal is sampled through a current sampling module in the IC, a DC offset elimination module eliminates the DC offset of the current-sampled signal and outputs the signal, and a preamplification module amplifies the signal output by the DC offset elimination module. The invention can omit all elements, power supplies and power supply switches outside the IC, effectively increase the signal-noise-ratio of the microphone input signal and reduce nonlinear distortion, and can also completely close the preamplification of the microphone in the IC to reduce power consumption.

Description

Integrated circuit, method and chip and the electronic equipment of the preposition amplification of microphone signal
Technical field
The present invention relates to electronic circuit, particularly the integrated technology of the preposition amplification of microphone.
Background technology
Microphone, formal name used at school is microphone, is the energy conversion device that voice signal is converted to the signal of telecommunication.Twentieth century, by changing by resistance at first, acoustic-electric develops into inductance to microphone, condenser type is changed, a large amount of new microphone techniques grow up gradually, and this is comprising the microphone such as aluminium strip, moving-coil, and current widely used capacitance microphone and electret microphone.
In the application scheme for electric current input, similar electret condenser microphone, traditional application scheme as shown in Figure 1.Microphone is converted to sound pressure signal a DC current signal and adds the current signal of an alternation.Pull-up resistor R directly changes into voltage signal by electric current, and voltage signal is coupled to the inner preamplifier input of IC (integrated circuit) through a capacitance C1 again.
But there is following problem in above-mentioned application scheme:
(1) IC inside is actually voltage signal is sampled, need a low noise external power supply VMIC, low noise require a shunt capacitance C2 with filtering noise, and because of low-power consumption require need S1 to carry out switching over; If this power supply comes from IC, need so independently pin pin (stitch) and a shunt capacitance;
(2) need a resistance R to carry out the effect of direct current biasing and faint amplification;
(3) need a capacitance C1 to determine the working point of IC inside;
(4) the small-signal multiplication factor of ordering due to A is less, and the inner amplification that needs high multiple, proposes harsh requirement to the noise of operational amplifier, causes the increase of IC area and the increase of power consumption;
(5) anode of microphone is exactly directly the output of faint amplification, and the channel-length modulation of the JFET (technotron) of microphone inside can cause nonlinear distortion question.
Summary of the invention
The object of the present invention is to provide integrated circuit, method and chip and the electronic equipment of the preposition amplification of a kind of microphone signal, save all elements and power supply and the mains switch of IC outside, and can effectively improve signal to noise ratio, the reduction nonlinear distortion of microphone input signal.
For solving the problems of the technologies described above, embodiments of the present invention provide the integrated circuit of the preposition amplification of a kind of microphone signal, comprise:
Microphone input stitch, for receiving the current signal of microphone input, microphone input stitch directly connects microphone positive pole;
Current sample module, for the current signal of microphone input stitch output is carried out to current sample, the signal of output after current sample, and the signal of exporting after current sample module is voltage signal or current signal;
DC maladjustment cancellation module, for carrying out the elimination of DC maladjustment to the signal of current sample module output;
Pre-amplifying module, for amplifying the signal of DC maladjustment cancellation module output.
Embodiments of the present invention also provide the method for the preposition amplification of a kind of microphone signal, comprise following steps:
Directly the current signal of being inputted by microphone is carried out to current sample;
Signal after current sample is carried out to the elimination of DC maladjustment;
Signal after DC maladjustment is eliminated is amplified.
Embodiments of the present invention also provide a kind of chip, the integrated circuit that this chip comprises the preposition amplification of above-mentioned microphone signal.
Embodiments of the present invention also provide a kind of electronic equipment, the integrated circuit that this electronic equipment comprises the preposition amplification of above-mentioned microphone signal.
Compared with prior art, the main distinction and effect thereof are embodiment of the present invention:
In IC outside, without any need for additional power supply and passive component, microphone is directly received the microphone input stitch of IC.Current sample module by IC inside is carried out current sample to microphone input signal, by DC maladjustment cancellation module, the signal after current sample is carried out elimination the output of DC maladjustment, by pre-amplifying module, the signal of DC maladjustment cancellation module output is amplified.Owing to being the microphone input stitch of microphone directly being received to IC, therefore can save all elements and power supply and the mains switch of IC outside, in the situation that being provided by IC inside, external power source further can save a pin pin and a shunt capacitance of IC.Because being carries out current sample but not voltage sample to microphone input signal by common-source common-gate current mirror, and the small signal gain of current sample is the more than 5 times of conventional method, make the present invention can effectively improve signal to noise ratio, the reduction nonlinear distortion of microphone input signal, and can the preposition amplification of microphone be turn-offed completely in IC inside, to reduce power consumption.
Further, current sample module is carried out current sample by current mirror to the current signal of microphone input stitch output, and the current signal that microphone is inputted to stitch output carries out K ratio doubly to be dwindled, to reach the object that reduces power consumption.
Further, current mirror can adopt common-source common-gate current mirror, to improve the Power Supply Rejection Ratio (Power Supply Rejection Ratio is called for short " PSRR ") to power supply, harmonic distortion and gain error that the channel-length modulation of reduction microphone causes.
Further, the DC maladjustment that the signal after current sample is carried out is eliminated, and can adopt the mode of voltage to realize, and eliminates offset voltage, also can adopt the mode of electric current to realize, and eliminates the DC component of electric current, and embodiments of the present invention can be realized flexibly.
Further, the elimination of offset voltage can be passed through the negative feedback loop of Superlow-pass filter, MOS transistor MP1, MOS transistor MN1 formation and realize, the bandwidth of this Superlow-pass filter is controlled in the insensitive ultralow frequency band of people's ear, this feedback loop is only worked to the input signal that approaches direct current, and it is inoperative to audio signal, thereby DC point is determined on fixing voltage VREF, do not affected the enlarging function of normal audio signal simultaneously.
Further, in the implementation for electric current, the elimination of current dc component can be by realizing the signal of current sample module output through a high pass filter; Or, realizing by primary current signal being deducted through low pass filter current signal after treatment, the implementation that makes to eliminate direct-current component is flexible and changeable.
Brief description of the drawings
Fig. 1 is according to the application scheme schematic diagram for electric current input, similar electret condenser microphone of the prior art;
Fig. 2 is according to the integrated circuit structure schematic diagram of the preposition amplification of microphone signal of first embodiment of the invention;
Fig. 3 is the schematic diagram of realizing according to first embodiment of the invention circuit;
Fig. 4 is according to the schematic diagram of specifically realizing DC maladjustment elimination based on GM-C filter in first embodiment of the invention;
Fig. 5 eliminates according to the DC maladjustment in second embodiment of the invention the schematic diagram of realizing by electric current;
Fig. 6 is according to the schematic diagram of specifically realizing DC maladjustment elimination based on Log-Domain high pass filter in second embodiment of the invention;
Fig. 7 is according to the schematic diagram of specifically realizing DC maladjustment elimination based on Log-Domain low pass filter in third embodiment of the invention;
Fig. 8 is according to the method flow diagram of the preposition amplification of microphone signal of four embodiment of the invention;
Fig. 9 is according to the method flow diagram of the preposition amplification of microphone signal of fifth embodiment of the invention.
Embodiment
In the following description, in order to understand the application better, many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs and the many variations based on following execution mode and amendment, also can realize the each claim of the application technical scheme required for protection.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.
First embodiment of the invention relates to the integrated circuit of the preposition amplification of a kind of microphone signal, outside without any need for additional power supply and passive component at this integrated circuit (IC), microphone is directly received on the microphone input stitch (MICIN PIN) of this IC.As shown in Figure 2, this IC comprises:
Microphone input stitch, for receiving the current signal of microphone input, microphone input stitch directly connects microphone positive pole.
Current sample module, for the current signal of microphone input stitch output is carried out to current sample, and the signal of output after current sample.
DC maladjustment cancellation module, for carrying out the elimination of DC maladjustment to the signal of current sample module output.
Pre-amplifying module, for amplifying the signal of DC maladjustment cancellation module output.
Specifically, input after the current signal that stitch receives microphone input by microphone, by current sample module, the current signal of this microphone is carried out to current sample, the A point electric current after current sample comprises direct current (I dC) and alternating current (i aC), flow through the electric current that A orders and be: i a=I dC+ i aC
The implementation of the circuit after A point has two kinds, and one is electric current implementation, and one is voltage implementation, but which kind of implementation no matter all needs to be undertaken by DC maladjustment cancellation module the elimination of DC maladjustment.
In the present embodiment, the mode that adopts voltage to realize, completes the elimination of DC maladjustment.That is to say, current sample module completes after current sample, and the current signal after sampling is transformed to voltage signal, and being about to flow through the current conversion that A orders is voltage signal V dC+ v aC, V dCwith the inner working point V that amplifies of IC opthere is an offset voltage V oS, that is: V dC=V op+ V oS, DC maladjustment cancellation module must be by the V in the voltage signal of current sample module output oSeliminate.After DC maladjustment cancellation module, the voltage that B is ordered is: V b=V op+ v aC.Make follow-up pre-amplifying module just can carry out normally small-signal amplification based on normal working point.
Specifically, as described in Figure 3, current sample module realizes by current mirror, and the current signal by current mirror, microphone input stitch being received carries out current sample, the current signal receiving is carried out to K ratio doubly and dwindle, to reach the object that reduces power consumption.Wherein, current mirror can adopt cascade (cascode) current mirror, changes the PSRR to power supply to improve signal, reduces harmonic distortion and gain error that the channel-length modulation of miaow head causes simultaneously.In addition, be appreciated that in actual applications, also can adopt the current mirror of other types to complete the current sample to current signal.
Electric current after dwindling flows through a resistance R 1, is converted to voltage signal OUT1, exports to DC maladjustment cancellation module.The negative feedback loop that DC maladjustment cancellation module consists of a Superlow-pass filter (Low Pass Filter is called for short " LP F ") and MOS transistor M P1, M N1, completes offset voltage V oSelimination.As shown in Figure 3, DC maladjustment cancellation module is made up of a Superlow-pass filter LPF and MP1, M N1, when the DC level of ordering as OUT1 like this increases, VFB (Voltage Feedback) can increase, the inverter of a high-gain of MP1, M N1 composition, the DC level that OUT1 orders is reduced, and this feedback loop makes DC level that OUT1 is ordered be fixed on the working point of appointment.
It should be noted that, as long as can meet noise and cost requirement, the LPF in DC maladjustment cancellation module can adopt the Superlow-pass filter of any framework to realize, as MOSFET-C filter, and GM-C filter or Log-Domain filter.In addition, be appreciated that Superlow-pass filter also can adopt the filter of other types, does not exemplify one by one at this.Describe in detail as an example of GM-C filter example below:
Negative feedback loop is made up of OTA (operation transconductance amplifier) LGMOP, building-out capacitor C1, MP1, the MN1 of ultralow mutual conductance, as shown in Figure 4.Miaow head input (grid end) to the transfer function of OUT1 is:
v OUT 1 v mic , gate ( s ) = ( 1 k g m , mic R 1 ) ( 1 + s / p 0 , LGM ) R 1 A 0 , LGM g m , FB + 1 + s / p 0 , LGM
v OUT 1 v mic , gate ( f = 0 ) ≈ 1 k g m , mic R 1 A 0 , LGM g m , FB R 1 = 1 k A 0 , LGM g m , mic g m , FB
v OUT 1 v mic , gate ( f → ∞ ) ≈ 1 k g m , mic R 1
f -3dB＝g m，FBR 1A 0，LGMp 0，LGM＝g m，FBR 1GBW LGM
GBW LGM = g m , LGM 2 π C 1 = 1 2 π A 0 , LGM p 0 , LGM
Wherein, g m, micfor the mutual conductance of miaow head, p 0, LGMfor the dominant pole of LGMOP, A 0, LGMfor the DC current gain of LGMOP, GBW lGMfor the bandwidth of LGMOP, g m, FBfor MP1, M N1 mutual conductance sum.
As can be seen from the above equation: the decaying to of direct current
Figure BSA00000210605700075
gain in voiced band is
Figure BSA00000210605700076
cut-off frequency is g m, FBr 1gBW lGM.
It will be understood by those skilled in the art that the bandwidth of the Superlow-pass filter being made up of LGMOP, building-out capacitor C1, determined by the mutual conductance of LGMOP and the electric capacity of C1, mutual conductance is less, and C1 is larger, and bandwidth is lower, but cost is higher.In the present embodiment, the bandwidth of the Superlow-pass filter being made up of LGMOP, building-out capacitor C1 is controlled in the insensitive ultralow frequency band of predetermined people's ear, as is controlled at below the insensitive 50Hz of people's ear.This feedback loop only works to the input signal that approaches direct current like this, and inoperative to normal audio signal, therefore the DC point of OUT1 can be determined on fixing voltage VREF, does not affect the enlarging function of normal audio signal simultaneously.
Because the gain in traditional scheme voiced band is g m, micr (but in traditional scheme in the resistance value ratio present embodiment of R the resistance of R1 much smaller), and in the present embodiment, by reasonable adjustment proportional factor k and R1 resistance value, the gain that can make OUT1 order reaches outside the more than 5 times of gain amplifier of traditional scheme IC.Present embodiment is reduced greatly to the noise requirements of power supply VMIC, LGMOP, MP1, MN1 and follow-up Pre_Amp (preposition amplification), the gain amplifier of follow-up Pre_Amp is required also greatly to reduce, thereby significantly reduced design difficulty, IC area cost and power consumption.And can improve the signal to noise ratio of microphone input, reduce nonlinear distortion.And for reducing power consumption, present embodiment can be turn-offed circuit completely in IC inside.
In addition, due in IC outside without any need for additional power supply and passive component, it is the microphone input stitch of microphone directly being received to IC, therefore can save all elements and power supply and the mains switch of IC outside, in the situation that external power source is provided separately by IC, further can save a pin and a shunt capacitance of IC.
Second embodiment of the invention relates to the integrated circuit of the preposition amplification of a kind of microphone signal.The second execution mode and the first execution mode are basic identical, and difference is mainly:
In the first embodiment, the DC maladjustment that signal after current sample is carried out is eliminated, to adopt the mode of voltage to realize, eliminate offset voltage, and in the present embodiment, the DC maladjustment that signal after current sample is carried out is eliminated, and is to adopt the mode of electric current to realize, and eliminates DC component.Therefore in current sample module, the current signal of microphone is carried out after current sample, without being converted to again voltage signal, the directly current signal of output after current sample.
Owing in current sample module, the current signal of microphone being carried out after current sample, flow through the electric current that A orders and be: i a=I dC+ i aC, and the just i that actual IC needs aC, therefore must be by I dCeliminate.After DC maladjustment cancellation module, obtain the inner i needing of IC aC, flowing through the electric current that B orders is i aC.On this basis, follow-up pre-amplifying module carries out small-signal amplification again.Pre-amplifying module, in the time that the signal of DC maladjustment cancellation module output is amplified, through current-voltage converter, is realized the enlarging function that current signal is converted to voltage signal and signal by the signal of DC maladjustment cancellation module output.This current-voltage converter is realized by the inverting amplifier of resistance 1, resistance 2 and operational amplifier composition.
Specifically, as shown in Figure 5, current sample module realizes by current mirror equally, and current mirror carries out k ratio doubly to input current and dwindles to reduce power consumption.Electric current after dwindling flows through a high pass filter (High Pass Filter is called for short " H PF "), and DC component I disappears dC, only remaining small-signal component i aC, small-signal component i aCby a current-to-voltage convertor I-V Converter in pre-amplifying module, be converted to voltage signal again, amplify simultaneously.Current-to-voltage convertor I-VConverter can pass through the inverting amplifier of resistance 1, resistance 2 and operational amplifier composition and realize (as shown in Figure 6).
Because Log-Domain filter is in current field processing signals, just can be used in this electric current implementation, therefore, high pass filter in present embodiment can be the Log-Domain filter based on current field, as shown in Figure 6, in order to know that resistance in component-bar chart 61 and the R1 in Fig. 4 are not same resistance, the resistance 1 in Fig. 6 represents with R1 ', and miaow head input (grid end) arrives V oUTsmall signal gain be:
v OUT v mic , gate = - 1 k g m , mic R 2
Visible, miaow head input (grid end) is to V oUTsmall signal gain and R1 ' irrelevant, but for fear of the noise of operational amplifier by excessive amplification, R1 ' value should not obtain too small.
In addition, be appreciated that in actual applications, high pass filter also can adopt the current field filter of other types, does not exemplify one by one at this.
Be not difficult to find, the DC maladjustment that signal after current sample is carried out is eliminated, can adopt the mode of voltage to realize, eliminate offset voltage (as the first execution mode), also can adopt the mode of electric current to realize, eliminate DC component (as the second execution mode), embodiments of the present invention can be realized flexibly.
Third embodiment of the invention relates to the integrated circuit of the preposition amplification of a kind of microphone signal.The 3rd execution mode and the second execution mode are basic identical, and difference is mainly:
In the second execution mode, the signal that DC maladjustment cancellation module passes through current sample module to export, through a high pass filter, completes the elimination of DC component.But in the 3rd execution mode, DC maladjustment cancellation module is the signal process low pass filter current signal after treatment by the signal of current sample module output being deducted to this output, completes the elimination of DC component.
Specifically, as shown in Figure 7, will be in the second execution mode the function of the elimination DC component that realizes of high pass filter (HPF), realize by deducting with primary current signal through low pass filter (LPF) current signal after treatment, subtraction is wherein realized by the current mirror of M N1/M N2 composition.
Because the elimination of DC component can be by realizing the signal of current sample module output through a high pass filter, also can realize by primary current signal being deducted through low pass filter current signal after treatment, the implementation that makes to eliminate DC component is flexible and changeable.
It should be noted that, each unit of mentioning in above-mentioned various execution mode is all logical block, physically, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical locations, the physics realization mode of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is only the key that solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, the above-mentioned various execution modes of the present invention are not introduced the unit not too close with solving technical problem relation proposed by the invention, and this does not show that above-mentioned various execution mode does not exist other unit.
In addition, it is worth mentioning that, the integrated circuit of the preposition amplification of microphone signal in above-mentioned various execution modes also can be included in chip or electronic equipment.
Four embodiment of the invention relates to the method for the preposition amplification of a kind of microphone signal, and idiographic flow as shown in Figure 8.
In step 810, directly the current signal of being inputted by microphone is carried out to current sample.Specifically, without any additional power supply and passive component, directly input stitch by microphone and receive the current signal that microphone is inputted, the current signal of microphone is carried out to current sample but not voltage sample.In the time carrying out current sample, by current mirror, the current signal of being inputted by microphone is carried out to current sample, the current signal of being inputted by microphone is carried out to K ratio doubly and dwindle.Wherein, current mirror can adopt common-source common-gate current mirror.
Then, in step 820, the signal after current sample is transformed to voltage signal, particularly, the electric current after dwindling flows through a resistance R 1, is converted to voltage signal OUT1.
Then,, in step 830, the voltage signal after conversion is carried out to the elimination of DC maladjustment.In the present embodiment, the elimination of the DC maladjustment of carrying out, is the elimination of offset voltage.Specifically, can pass through the negative feedback loop of Superlow-pass filter, MOS transistor MP1, MOS transistor MN1 formation, complete the elimination of offset voltage.Wherein, the bandwidth of Superlow-pass filter need to be controlled in the insensitive ultralow frequency band of predetermined people's ear.
Then,, in step 840, the signal after DC maladjustment is eliminated is amplified.
Be not difficult to find, present embodiment is the method execution mode corresponding with the first execution mode, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first execution mode.
Fifth embodiment of the invention relates to the method for the preposition amplification of a kind of microphone signal.The 5th execution mode and the 4th execution mode are basic identical, and difference is mainly:
In the 4th execution mode, the DC maladjustment that signal after current sample is carried out is eliminated, be to adopt the mode of voltage to realize, eliminate offset voltage, and in the present embodiment, the DC maladjustment that signal after current sample is carried out is eliminated, be to adopt the mode of electric current to realize, eliminate the DC component of electric current, without the signal after current sample is transformed to voltage signal, directly the signal DC maladjustment after current sample is eliminated, eliminated DC component.
In present embodiment, in the time carrying out the elimination of DC maladjustment, by by the signal after current sample through a high pass filter, complete the elimination of DC component.Or, in the time carrying out the elimination of DC maladjustment, by the signal after current sample being deducted to the signal process low pass filter current signal after treatment after current sample, complete the elimination of DC component.
Idiographic flow as shown in Figure 9, in step 910, directly carries out current sample to the current signal of being inputted by microphone.This step is identical with step 810, does not repeat them here.
Then, in step 920, the elimination of the DC component that the current signal after current sample is carried out.Such as, can be by the current signal after current sample through a high pass filter, DC component disappears; Or, the current signal after current sample can be deducted to this current signal through low pass filter current signal after treatment, realize the elimination of DC component.
Then,, in step 930, the signal after DC component is eliminated amplifies.Specifically can pass through current-voltage converter, realize the enlarging function that the current signal of the DC component that disappears is converted to voltage signal and signal.
Be not difficult to find, present embodiment is and second or the corresponding method execution mode of the 3rd execution mode, and present embodiment can be with second or the 3rd execution mode enforcement of working in coordination.The second or the 3rd correlation technique details of mentioning in execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable to second or the 3rd in execution mode.
Although pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and described, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (12)

1. an integrated circuit for the preposition amplification of microphone signal, is characterized in that, comprises:
Microphone input stitch, for receiving the current signal of microphone input, described microphone input stitch directly connects microphone positive pole;
Current sample module, for the current signal of described microphone input stitch output is carried out to current sample, the signal of output after current sample, and the signal of exporting after current sample module is voltage signal or current signal;
DC maladjustment cancellation module, for carrying out the elimination of DC maladjustment to the signal of described current sample module output; And,
For the voltage signal of current sample module output, the elimination of the DC maladjustment that described DC maladjustment cancellation module carries out, is the elimination of offset voltage; Described DC maladjustment cancellation module, by Superlow-pass filter, 2 negative feedback loops that metal-oxide semiconductor (MOS) MOS transistor forms, completes the elimination of described offset voltage;
For the current signal of current sample module output, the elimination of the DC maladjustment that described DC maladjustment cancellation module carries out, is the elimination of the DC component to the electric current of exporting through current sample module; The signal that described DC maladjustment cancellation module passes through described current sample module to export, through a high pass filter, completes the elimination of described current dc component; Or described DC maladjustment cancellation module, by the current signal of described current sample module output being deducted to the current signal process low pass filter current signal after treatment of this output, completes the elimination of described current dc component; Pre-amplifying module, for amplifying the signal of described DC maladjustment cancellation module output.
2. the integrated circuit of the preposition amplification of microphone signal according to claim 1, is characterized in that, described current sample module realizes by current mirror, and this current mirror adopts common-source common-gate current mirror.
3. according to the integrated circuit of the preposition amplification of microphone signal described in any one in claim 1 to 2, it is characterized in that, described current sample module is also for before the signal after current sample in output, signal after current sample is transformed to voltage signal, and the signal of described current sample module output is the voltage signal after described conversion.
4. the integrated circuit of the preposition amplification of microphone signal according to claim 3, is characterized in that, described Superlow-pass filter is MOSFET-C filter or transconductance capacitor GM-C filter or Log-Domain filter.
5. the integrated circuit of the preposition amplification of microphone signal according to claim 3, is characterized in that, the bandwidth of described Superlow-pass filter is controlled in the insensitive ultralow frequency band of predetermined people's ear.
6. the integrated circuit of the preposition amplification of microphone signal according to claim 1, is characterized in that, described high pass filter is the Log-Domain filter based on current field.
7. the integrated circuit of the preposition amplification of microphone signal according to claim 1, is characterized in that, described low pass filter is the Log-Domain filter based on current field.
8. the integrated circuit of the preposition amplification of microphone signal according to claim 1, it is characterized in that, described pre-amplifying module is in the time amplifying the signal of described DC maladjustment cancellation module output, the signal of described DC maladjustment cancellation module output, through current-voltage converter, is realized to the enlarging function that current signal is converted to voltage signal and signal.
9. the integrated circuit of the preposition amplification of microphone signal according to claim 8, is characterized in that, described current-voltage converter is realized by the inverting amplifier of resistance 1, resistance 2 and operational amplifier composition.
10. a method for the preposition amplification of microphone signal, is characterized in that, comprises following steps:
Current sample module is directly carried out current sample to the current signal of being inputted by microphone;
DC maladjustment cancellation module carries out the elimination of DC maladjustment to the signal after described current sample; And,
For the voltage signal of current sample module output, the elimination of the DC maladjustment that described DC maladjustment cancellation module carries out, is the elimination of offset voltage; Described DC maladjustment cancellation module, by Superlow-pass filter, 2 negative feedback loops that metal-oxide semiconductor (MOS) MOS transistor forms, completes the elimination of described offset voltage;
For the current signal of current sample module output, the elimination of the DC maladjustment that described DC maladjustment cancellation module carries out, is the elimination of the DC component to the electric current of exporting through current sample module; The signal that described DC maladjustment cancellation module passes through described current sample module to export, through a high pass filter, completes the elimination of described current dc component; Or described DC maladjustment cancellation module, by the current signal of described current sample module output being deducted to the current signal process low pass filter current signal after treatment of this output, completes the elimination of described current dc component; Signal after DC maladjustment is eliminated is amplified.
11. 1 kinds of chips, is characterized in that,
The integrated circuit that described chip comprises the preposition amplification of microphone signal claimed in claim 1.
12. 1 kinds of electronic equipments, is characterized in that,
The integrated circuit that described electronic equipment comprises the preposition amplification of microphone signal claimed in claim 1.
CN201010240618.7A 2010-07-30 2010-07-30 Integrated circuit, method and chip for microphone signal preamplification as well as electronic equipment Active CN102026062B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201010240618.7A CN102026062B (en) 2010-07-30 2010-07-30 Integrated circuit, method and chip for microphone signal preamplification as well as electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201010240618.7A CN102026062B (en) 2010-07-30 2010-07-30 Integrated circuit, method and chip for microphone signal preamplification as well as electronic equipment

Publications (2)

Publication Number Publication Date
CN102026062A CN102026062A (en) 2011-04-20
CN102026062B true CN102026062B (en) 2014-06-25

Family

ID=43866818

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201010240618.7A Active CN102026062B (en) 2010-07-30 2010-07-30 Integrated circuit, method and chip for microphone signal preamplification as well as electronic equipment

Country Status (1)

Country Link
CN (1) CN102026062B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104104345A (en) * 2013-04-02 2014-10-15 安凯(广州)微电子技术有限公司 Low-noise microphone input amplifier
CN103594108B (en) * 2013-11-21 2016-07-27 四川和芯微电子股份有限公司 Audio frequency broadcast system
CN107896358A (en) * 2017-11-24 2018-04-10 江门市兰格电子有限公司 A kind of voice modifies device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1938941A (en) * 2004-02-09 2007-03-28 音频专用集成电路公司 Digital microphone
CN101217263A (en) * 2008-01-17 2008-07-09 埃派克森微电子有限公司 A compensatory method and device for DC offset voltage of amplifier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3480437B2 (en) * 2000-09-04 2003-12-22 ヤマハ株式会社 Background noise removing device, background noise removing method, and recording medium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1938941A (en) * 2004-02-09 2007-03-28 音频专用集成电路公司 Digital microphone
CN101217263A (en) * 2008-01-17 2008-07-09 埃派克森微电子有限公司 A compensatory method and device for DC offset voltage of amplifier

Also Published As

Publication number Publication date
CN102026062A (en) 2011-04-20

Similar Documents

Publication Publication Date Title
US8610497B2 (en) System and method for capacitive signal source amplifier
US20080002841A1 (en) Low-power high-PSRR current-mode microphone pre-amplifier system and method
US7259627B1 (en) True differential microphone amplifier
CN103580633B (en) Semiconductor integrated circuit and the radio telecommunication terminal including the semiconductor integrated circuit
CN106877830B (en) Analog front-end circuit for detecting physiological potential signals
CN102026062B (en) Integrated circuit, method and chip for microphone signal preamplification as well as electronic equipment
EP1978638A3 (en) A negative gm circuit, a filter and low noise amplifier including such a filter
JP2010147988A (en) Amplifier circuit and radio receiver
TWI342111B (en) Amplifying circuit and associated linearity improving method
Sreenivasulu et al. A 0.3 V, 56 dB DR, 100 Hz fourth order low-pass filter for ECG acquisition system
Wang et al. A scalable high-performance switched-capacitor filter
US10095252B2 (en) Voltage-to-current converter
EP3298688A1 (en) An ultra-low-power and low-noise amplifier
CN206259909U (en) A kind of fully-differential amplifier circuit of high accuracy HDR
US9564857B2 (en) Low noise amplifier and chip
CN110225425A (en) A kind of microphone input circuit
US8279011B2 (en) Amplifier circuit and method of signal amplification
CN206611390U (en) A kind of analog front circuit for physiology potential signal detection
CN106411269A (en) Current feedback type instrument amplifier with low power consumption and low noise
WO2007008042A1 (en) Cascode low-noise amplifier
US20130049857A1 (en) High gain amplifier method using low-valued resistances
US20200321921A1 (en) Common source preamplifier for a mems capacitive sensor
CN210042121U (en) Microphone input circuit
JP2009284387A (en) Semiconductor integrated circuit
Nguyen et al. Low-voltage, low-power CMOS operation transconductance amplifier with rail-to-rail differential input range

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
ASS Succession or assignment of patent right

Owner name: JUXIN(ZHUHAI) TECHNOLOGY CO., LTD.

Free format text: FORMER OWNER: JULI INTEGRATED CIRCUIT DESIGN CO., LTD.

Effective date: 20150604

C41 Transfer of patent application or patent right or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 519085 ZHUHAI, GUANGDONG PROVINCE TO: 519000 ZHUHAI, GUANGDONG PROVINCE

TR01 Transfer of patent right

Effective date of registration: 20150604

Address after: 519000, C, No. 1, No. four, 1 hi tech Zone, Tang Wan Town, Guangdong, Zhuhai

Patentee after: ACTIONS (ZHUHAI) TECHNOLOGY Co.,Ltd.

Address before: 519085 No. 1, unit 15, building 1, 1 Da Ha Road, Tang Wan Town, Guangdong, Zhuhai

Patentee before: Juli Integrated Circuit Design Co., Ltd.

CP03 Change of name, title or address

Address after: 519085 High-tech Zone, Tangjiawan Town, Zhuhai City, Guangdong Province

Patentee after: ACTIONS TECHNOLOGY Co.,Ltd.

Address before: Zone C, floor 1, factory building, No.1, Keji 4th Road, high tech Zone, Tangjiawan Town, Zhuhai City, Guangdong Province

Patentee before: ACTIONS (ZHUHAI) TECHNOLOGY Co.,Ltd.

CP03 Change of name, title or address