CN103840775B - Limiting amplifier allowing direct-current offset eliminating function to be achieved on sheet - Google Patents
Limiting amplifier allowing direct-current offset eliminating function to be achieved on sheet Download PDFInfo
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- CN103840775B CN103840775B CN201410069481.1A CN201410069481A CN103840775B CN 103840775 B CN103840775 B CN 103840775B CN 201410069481 A CN201410069481 A CN 201410069481A CN 103840775 B CN103840775 B CN 103840775B
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Abstract
The invention discloses a limiting amplifier allowing a direct-current offset eliminating function to be achieved on a sheet. The limiting amplifier comprises an input circuit, an amplifying circuit, an output circuit and a direct-current negative feedback circuit. The direct-current negative feedback circuit comprises a first amplifier, a second amplifier, a first capacitor, a second capacitor, a first resistor and a second resistor. The first amplifier, the second amplifier, the first capacitor and the second capacitor form a closed loop. Direct-current offset of the amplifying circuit is fed back to the input circuit to be used for eliminating direct-current offset of the circuits after being sampled through a low-pass filter formed by the first resistor, the second resistor, the first capacitor and the second capacitor of the direct-current feedback circuit, and amplified through the first amplifier. According to the limiting amplifier, a direct-current offset eliminating circuit is obtained through the small capacitors on the sheet, and the phenomenon that error codes are produced when low-frequency cut-off frequency is excessively high due to the direct-current offset eliminating circuit can not occur even when a long string of 1 signals or a long string of 0 signals are processed.
Description
Technical field
The present invention relates to a kind of limiting amplifier being applied to optical communication field, more particularly, to one kind has high gain-bandwidth
With the limiting amplifier that DC maladjustment elimination function is realized on piece.
Background technology
With the fast development of computer network, the extensive application of multimedia communication and building on a large scale of information superhighway
If, the demand more and more higher to high-speed communication system for the people.EPON because high bandwidth, low cost, anti-interference the advantages of
Become most attractive a solution.Limiting amplifier is as the important component part in photoreceiver, main work(
Can be that the clock recovery circuitry that the less voltage signal providing prime trans-impedance amplifier amplifies further for rear class uses.
Fig. 1 show traditional limiting amplifier, mainly includes input stage, multiple gain stage, output stage and direct current and bears instead
Feedback network.Input stage is mainly realized impedance matching and is reduced transmission line loss, is simultaneously achieved level shift, provides to internal circuit
Suitable DC level.Multiple gain stages are used for providing enough gains, even if last when input signal amplitude very little
One-level also can be operated in clipping state；Meanwhile, gain stage has enough bandwidth, makes whole amplifier disclosure satisfy that specific biography
Defeated speed.Output stage is realized impedance matching and is provided sufficiently large driving force.Direct current negative feedback network is used for eliminating direct current mistake
Adjust, stablize the DC level of whole circuit.Direct current negative feedback network while stabilizing circuit DC level, in the exchange of circuit
One low-frequency cut-off frequency is introduced on characteristic, too high low-frequency cut-off frequency can lead to continuously " 1 " or continuous in amplification
When " 0 ", outfan can produce drift, ultimately results in error code.In order to overcome this problem it will usually increase direct current negative feedback
The resistance of the low pass filter in network and the value of electric capacity, and capacity area is difficult to greatly very much on piece, so traditional does
Method is using the outer electric capacity of piece.
Therefore, those skilled in the art is devoted to developing the limited range enlargement realizing on a kind of that DC maladjustment eliminates function
Device.
Content of the invention
In view of the drawbacks described above of prior art, the technical problem to be solved is to provide one kind for photoreceiver
New limiting amplifier, even if realize DC maladjustment using small capacitances on piece to eliminate circuit so that processing long string of " 1 " signal
Or during long string of " 0 " signal, all without because DC maladjustment to eliminate the low-frequency cut-off frequency that causes of circuit too high and produce by mistake
Code.
For achieving the above object, the invention provides the limiting amplifier that DC maladjustment eliminates function is realized on a kind of,
Including input circuit, amplifying circuit, output circuit and direct current negative-feedback circuit；
Described input circuit is used for buffer input signal and level shift；
Described amplifying circuit is used for providing gain；The outfan phase of the input of described amplifying circuit and described input circuit
Even, the outfan of described amplifying circuit respectively with the input of described output circuit and the input of described direct current negative-feedback circuit
Connect；
Described output circuit is used for output signal；
Described direct current negative-feedback circuit is used for eliminating DC maladjustment, stablizes the DC level of described amplifying circuit；Described straight
The input of stream negative-feedback circuit is connected with the outfan of described amplifying circuit, the outfan of described direct current negative-feedback circuit and institute
State input circuit to be connected；
It is characterized in that, described direct current negative-feedback circuit includes the first amplifier (a1), the second amplifier (a2), the first electricity
Hold (c21), the second electric capacity (c22), first resistor (r21) and second resistance (r22), wherein, described first electric capacity (c21) and institute
Stating the second electric capacity (c22) is identical, and described first resistor (r21) and described second resistance (r22) are identicals；
The outfan of described amplifying circuit is by described first resistor (r21) and described second resistance (r22) and described the
The input of one amplifier (a1) connects；The outfan of described first amplifier (a1) respectively with described input circuit and described
The input of two amplifiers (a2) connects；The outfan of described second amplifier (a2) passes through described first electric capacity (c21) and institute
The input stating the second electric capacity (c22) with described first amplifier (a1) is connected.
Further, described amplifying circuit includes some amplifier stages, and some described amplifier stages cascade successively.
Further, described amplifying circuit includes 5 amplifier stages, and described 5 amplification level structures are identical.
Further, described input circuit includes external current source, current lens array, input difference amplifier, emitter stage
Follower and direct current reversed feedback amplifier.
Further, described current lens array includes some audions and some resistance；
Described audion (q37), described audion (q38), described audion (q39), described audion (q310) and institute
State audion (q311) common base；The emitter stage of described audion (q37) is directly grounded by described resistance (r35), and described three
The colelctor electrode of pole pipe (q37) is connected with described external current source (i)；The emitter stage of described audion (q38) passes through described resistance
(r36) it is directly grounded, colelctor electrode is connected with described input difference amplifier；The emitter stage of described audion (q39) passes through described
Resistance (r37) is directly grounded, and colelctor electrode is connected with described direct current reversed feedback amplifier；The emitter stage of described audion (q310) leads to
Cross described resistance (r38) to be directly grounded；The emitter stage of described audion (q311) is directly grounded by described resistance (r39), institute
The colelctor electrode of the colelctor electrode and described audion (q311) of stating audion (q310) is connected with the input of described amplifying circuit.
Further, described input difference amplifier include audion (q31), audion (q32), load resistance (r31),
Load resistance (r32), feedback resistance (r33) and feedback resistance (r34)；
The base stage of described audion (q31) is connected with described input signal with the base stage of described audion (q32)；Described three
The colelctor electrode of pole pipe (q31) is connected with power supply vdd by described load resistance (r31), and the colelctor electrode of described audion (q32) leads to
Cross described load resistance (r32) to be connected with described power supply vdd；The emitter stage of described audion (q31) passes through described feedback resistance
(r33) it is connected with the colelctor electrode of described audion (q38)；The emitter stage of described audion (q32) passes through described feedback resistance
(r34) it is connected with the colelctor electrode of described audion (q38).
Further, described direct current reversed feedback amplifier includes audion (q33), audion (q34), described load resistance
And described load resistance (r32) (r31)；
The base stage of the base stage of described audion (q33) and described audion (q34) and the output of described D.C. feedback circuit
End connects；The colelctor electrode of described audion (q33) is connected with described power supply vdd by described load resistance (r31)；Described three poles
The colelctor electrode of pipe (q34) is connected with described power supply by described load resistance (r32)；Described audion (q33) and described three poles
The emitter stage of pipe (q34) is connected with the colelctor electrode of described audion (q39).
Further, described emitter follower includes audion (q35) and audion (q36)；
The base stage of described audion (q35) is connected with the colelctor electrode of described audion (q31), described audion (q36)
Base stage is connected with the colelctor electrode of described audion (q32), the colelctor electrode of described audion (q35) and described audion (q36) with
Power supply is connected, and the emitter stage of described audion (q35) and described audion (q36) is connected with the input of described amplifying circuit.
Further, described amplifying circuit includes some audions, some resistance, electric capacity (c41) and electric capacity (c42)；
The base stage of described audion (q41) and described audion (q42) is connected with the outfan of described input circuit；Described
The colelctor electrode of audion (q41) is connected with power supply by described resistance (rc1), and the colelctor electrode of described audion (q42) passes through institute
State resistance (rc2) to be connected with power supply；The emitter stage of described audion (q41) passes through described resistance (re1) and described resistance (re2)
It is connected with the emitter stage of described audion (q42)；And in described resistance (re1) and the upper described electric capacity in parallel of described resistance (re2)
And described electric capacity (c42) (c41)；Described audion (q45), described audion (q46), described audion (q47), described three poles
Pipe (q48), described resistance (r41), described resistance (r42), described resistance (r43) and described resistance (r44) constitute current mirror knot
Structure；Described audion (q43) and described audion (q44) constitute emitter follower.
Further, described resistance (rc1) and described resistance (rc2) are passive component resistor.
The main channel realizing the limiting amplifier that DC maladjustment eliminates function on a kind of of the present invention is to be inputted by one
Circuit, an amplifying circuit and an output circuit composition, amplifying circuit includes 5 amplifier stages.Input circuit receives difference letter
Number vin+/vin-, amplified output difference signal vm1+/vm1-.Amplifying circuit receives differential signal vm1+/vm1-, and puts
Big output difference signal vm2+/vm2-, five amplifier stages have enough gains to make vm2+/vm2- enter clipping state.Output electricity
Road receives differential signal vm2+/vm2-, produces differential output signal vout+/vout- after amplification.Direct current negative feedback loop route electricity
Resistance r21, r22, electric capacity c21, c22 and amplifier a1, a2 composition, amplifier a1, a2 and electric capacity c21, c22 constitute closed loop.Put
Big DC deviation at afterbody amplifier stage for the circuit passes through the low-pass filtering that resistance r21, r22 and electric capacity c21, c22 are constituted
Device is sampled, and amplified device a1 feeds back to input circuit, for eliminating the DC maladjustment of circuit after amplifying.
Present invention achieves a kind of limiting amplifier for optic communication, good elimination directly can be reached using on-chip capacitance
Run off and adjust effect, and obtain relatively low low-frequency cut-off frequency so that this limiting amplifier has outstanding performance, even if at place
Error code is not produced when reason long string " 1 " signal or long string " 0 " signal yet.
Technique effect below with reference to design, concrete structure and generation to the present invention for the accompanying drawing is described further, with
It is fully understood from the purpose of the present invention, feature and effect.
Brief description
Fig. 1 is the structure principle chart of conventional limiting amplifier；
Fig. 2 is that the circuit structure realizing the limiting amplifier that DC maladjustment eliminates function on a kind of of the present invention is illustrated
Figure；
Fig. 3 is that the input circuit structure realizing the limiting amplifier that DC maladjustment eliminates function on a kind of of the present invention is shown
It is intended to；
Fig. 4 is the amplification circuit structure realizing the limiting amplifier that DC maladjustment eliminates function on a kind of of the present invention
Schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings embodiments of the invention are elaborated: the present embodiment is with technical solution of the present invention premise
Under implemented, give detailed embodiment and specific operating process, but protection scope of the present invention be not limited to following
Embodiment.
The physical circuit operating diagram that DC maladjustment eliminates the limiting amplifier of function is realized on a kind of of the present invention
As shown in Fig. 2 including input circuit, amplifying circuit, output circuit and direct current negative-feedback circuit.
The circuit diagram of input circuit concrete as Fig. 3, including by audion q37, q38, q39, q310, q311 and resistance r35,
R36, r37, r38, r39 composition current lens array, born by audion q31, q32 and load resistance r31, r32 and emitting stage
Feedback resistance r33, r34 composition difference amplifier, born by the direct current that audion q33, q34 and load resistance r31, r32 form
Feedback amplifier and the emitter follower being made up of audion q35 and q36.
In current lens array, audion q37, audion q38, audion q39, audion q310 and audion q311 are altogether
Base stage；The emitter stage of audion q37 is directly grounded by resistance r35, and the colelctor electrode of audion q37 is connected with external current source i；
The emitter stage of audion q38 is directly grounded by resistance r36, and colelctor electrode is connected with input difference amplifier；Audion q39 sends out
Emitter-base bandgap grading is directly grounded by resistance r37, and colelctor electrode is connected with direct current reversed feedback amplifier；The emitter stage of audion q310 passes through electricity
Resistance r38 is directly grounded；The emitter stage of audion q311 is directly grounded by resistance r39, the colelctor electrode of audion q310 and three poles
The colelctor electrode of pipe q311 is connected with the outfan of amplifying circuit.Current lens array gives input difference amplifier respectively, and direct current is born anti-
Feedback amplifier and emitting stage follower provide electric current.
In difference amplifier, the base stage of audion q31 is connected with differential signal vin+/vin- with the base stage of audion q32；
The colelctor electrode of audion q31 is connected with power supply by load resistance r31, the colelctor electrode of audion q32 pass through load resistance r32 with
Power supply is connected；The emitter stage of audion q31 is connected with the colelctor electrode of audion q38 by feedback resistance r33；Audion q32's
Emitter stage is connected with the colelctor electrode of audion q38 by feedback resistance r34.Because difference amplifier does not need very big gain,
So reducing the gain of amplifier to exchange high bandwidth for using emitting stage negative feedback resistor, meanwhile, emitting stage negative feedback resistor
Equivalent input capacitance can also be reduced；Also had the advantage that using emitting stage negative feedback resistor, the gain of amplifier can be with Approximate Equivalent
For the ratio of resistance r31 and resistance r33, one can be obtained with the unrelated gain of the factors such as technological temperature by resistors match.
In direct current reversed feedback amplifier, the base stage of the base stage of audion q33 and audion q34 and D.C. feedback circuit
Outfan connects；The colelctor electrode of audion q33 is connected with power supply by load resistance r31；The colelctor electrode of audion q34 passes through negative
Carry resistance r32 to be connected with power supply；Audion q33 is connected with the colelctor electrode of audion q39 with the emitter stage of audion q34.Three poles
Pipe q33 and q34 and difference amplifier shared load r31 and r32.The base stage of audion q33 and q34 is coupled with direct current negative feedback
Output point vf+ and vf- on, vf+ and vf- controls the electric current of audion q33 and q34 to reach elimination circuit direct imbalance, stable
The purpose of circuit direct operating point.
In emitter follower, the base stage of audion q35 is connected with the colelctor electrode of audion q31, the base of audion q36
Pole is connected with the colelctor electrode of audion q32, and audion q35 is connected with power supply with the colelctor electrode of audion q36, audion q35 and
The emitter stage of audion q36 is connected with the input of amplifying circuit.Differential signal finally by emitter follower output vm1+/
Vm1-, emitter follower is mainly isolates rear class input capacitance, reduces the impact to this grade of bandwidth for the rear class input capacitance；Except this
Outside, level shift is also provided, provides suitable DC level to rear class.
Amplifying circuit adopts amplifier stage cascade circuit, in the present embodiment, using the cascade of Pyatyi amplifier stage, because Pyatyi is put
Big level cascade can reach optimal amplification effect.Differential signal vm1+/vm1- produces clipping state through amplification after entering amplifying circuit
Differential signal vm2+/vm2-.Amplifying circuit in the clipping amplifier circuit of the present invention needs enough gains to ensure institute
There is signal can enter clipping state, also need to enough bandwidth to meet specific transfer rate simultaneously.In order to provide bandwidth
And high-gain, amplifying circuit would generally be using to broadband technology.Conventional broadband technology has a lot: ft doubling technology, inductance peak
Change technology, cherry-hooper structure etc..Wherein inductor peaking technology needs to use inductance, but inductance area is too big, can make
The cost of whole chip improves；Ft doubling technology and cherry-hooper structure are required for increasing additional circuit, not only increased
The complexity of circuit also results in more power consumptions.
Fig. 4 show the circuit diagram that implements of the amplifying circuit of the clipping amplifier circuit of the present invention, audion q41 and
The base stage of audion q42 is connected with the outfan of input circuit；The colelctor electrode of audion q41 is connected with power supply by resistance rc1,
The colelctor electrode of audion q42 is connected with power supply by resistance rc2；The emitter stage of audion q41 passes through resistance re1 and resistance re2
It is connected with the emitter stage of audion q42；And on resistance re1 and resistance re2 shunt capacitance c41 and electric capacity c42；Audion q45,
Audion q46, audion q47, audion q48, resistance r41, resistance r42, resistance r43 and resistance r44 constitute current-mirror structure；
Constitute emitter follower with by audion q43 and q44.
In order to obtain higher bandwidth, amplifying circuit has selected audion q41, q42 of more high intrinsic frequency as putting
Big pipe, in order to reduce noise, employs passive component resistor rc1, rc2 as load.Notice and limit the one of audion speed
Individual key factor is the input limit that base resistance rb and base-emitter parasitic capacitance cbe produce, so employing resistance
The negative feedback resistor of re1 and re2.According to the Miller effect, input capacitance is changed into cin=cbe/ (1+gm*re1) from cin=cbe,
Wherein, gm is audion q41 and the mutual conductance of audion q42.So input limit increases 1+gm*re1 times.In order to expand further
Exhibition bandwidth, employs zero pole point technology for eliminating, as shown in figure 4, electric capacity c41, c42 in emitter degeneration resistor in parallel,
One 0. 1/ (re1*c41) and limit (1+gm*re1)/(re1*c41) can be produced on frequency characteristic, control re1 and
The size of c41, makes 1/ (re1*c41)=1/ (rc1*cl), and wherein cl is output node electric capacity, and dominant pole is changed into (1+gm*
Re1)/(re1*c41)=(1+gm*re1)/(rc1*c41), dominant pole increases 1+gm*re1 times.Signal is finally by three poles
The emitter follower that pipe q43, q44 are constituted exports to subordinate, and emitter follower circuit is used to isolate subordinate's input capacitance
Impact to this grade of bandwidth, provides level shift to facilitate the interconnection of this grade and subordinate simultaneously.
Through amplifying the differential signal vm2+/vm2- producing clipping state after differential signal vm1+/vm1- entrance amplifying circuit,
Output circuit receives differential signal vm2+/vm2-, produces final differential output signal vout+/vout-, output electricity after amplification
Road is mainly provides impedance matching and enough driving forces.Because limiting amplifier has very big gain, input circuit
The amplified device that can lead to output current of DC maladjustment enters saturation, so must be added to DC maladjustment to eliminate electricity
Road, i.e. direct current negative-feedback circuit.Direct current negative feedback loop route first resistor r21 of the limiting amplifier of the present invention, second resistance
R22, the first electric capacity c21, the second electric capacity c22 and the first amplifier a1, the second amplifier a2 composition.In the present embodiment, first
The electric capacity of electric capacity c21 and the second electric capacity c22 is identical, is c；First resistor r21 is identical with the resistance sizes of second resistance r22, is
r；The gain of the first amplifier a1 is a1, and the gain of the second amplifier a2 is a2.First amplifier a1, the second amplifier a2 and
First electric capacity c21, the second electric capacity c22 constitute closed loop, using the Miller effect, obtain equivalent electric in the input of the first amplifier a1
Hold ceq=(1+a1*a2) * c, by the gain of appropriate design the first amplifier a1 and the second amplifier a2, very little can be used
Area obtains very big equivalent capacity.DC deviation at amplifying circuit afterbody passes through first resistor r21, second resistance
The low pass filter sampling that r22 and the first electric capacity c21, the second electric capacity c22 are constituted, feeds back to defeated after amplifying through the first amplifier a1
Enter circuit, for eliminating the DC maladjustment of circuit.Direct current negative-feedback circuit eliminate DC maladjustment while, also in the friendship of circuit
Introduce low-frequency cut-off frequency on properties of flow, this frequency be represented by flf=(a*a1+1)/(2 π * r*ceq)=(a*a1+1)/
[2π*r*(1+a1*a2)*c]≈a/(2π*r*c*a2).Wherein, a is the gain of input circuit and amplifying circuit.From ceq and flf
Expression formula can be seen that gain by increasing the second amplifier a2, not only can obtain a big equivalent capacity, reach
Preferably DC maladjustment eradicating efficacy, can also obtain a rational low-frequency cut-off frequency so that this limiting amplifier is at place
Also error code will not be produced when reason long string of " 0 " signal and " 1 " signal.
The preferred embodiment of the present invention described in detail above.It should be appreciated that the ordinary skill of this area need not be created
The property made work just can make many modifications and variations according to the design of the present invention.Therefore, all technical staff in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment under this invention's idea on the basis of existing technology
Scheme, all should be in the protection domain being defined in the patent claims.
Claims (7)
1. the limiting amplifier that DC maladjustment eliminates function is realized on a kind of, including input circuit, amplifying circuit, output circuit
With direct current negative-feedback circuit；
Described input circuit is used for buffer input signal and level shift；
Described amplifying circuit is used for providing gain；The input of described amplifying circuit is connected with the outfan of described input circuit,
The outfan of described amplifying circuit is connected with the input of described output circuit and the input of described direct current negative-feedback circuit respectively
Connect；
Described output circuit is used for output signal；
Described direct current negative-feedback circuit is used for eliminating DC maladjustment, stablizes the DC level of described amplifying circuit；Described direct current is born
The input of feedback circuit is connected with the outfan of described amplifying circuit, and the outfan of described direct current negative-feedback circuit is defeated with described
Enter circuit to be connected；
It is characterized in that, described direct current negative-feedback circuit include the first amplifier a1, the second amplifier a2, the first electric capacity c21,
Two electric capacity c22, first resistor r21 and second resistance r22, wherein, described first electric capacity c21 is phase with described second electric capacity c22
With, described first resistor r21 and described second resistance r22 are identicals；
The outfan of described amplifying circuit is by described first resistor r21 and described second resistance r22 and described first amplifier
The input of a1 connects；The outfan of described first amplifier a1 respectively with described input circuit and described second amplifier a2
Input connects；The outfan of described second amplifier a2 pass through described first electric capacity c21 and described second electric capacity c22 with described
The input of the first amplifier a1 is connected；
Described amplifying circuit includes some amplifier stages, and some described amplifier stages cascade successively；Described several amplify level structure phase
With；Described input circuit includes external current source i, current lens array, input difference amplifier, direct current reversed feedback amplifier and sends out
Emitter follower.
2. the limiting amplifier that DC maladjustment eliminates function, wherein, described current mirror battle array are realized on piece as claimed in claim 1
Row include audion q37, audion q38, audion q39, audion q310 and audion q311 and resistance r35, resistance
R36, resistance r37, resistance r38 and resistance r39；Described audion q37, audion q38, audion q39, audion q310 and three
Pole pipe q311 common base；The emitter stage of described audion q37 is directly grounded by described resistance r35, the collection of described audion q37
Electrode is connected with described external current source i；The emitter stage of described audion q38 is directly grounded by described resistance r36, colelctor electrode
It is connected with described input difference amplifier；The emitter stage of described audion q39 is directly grounded by described resistance r37, colelctor electrode
It is connected with described direct current reversed feedback amplifier；The emitter stage of described audion q310 is directly grounded by described resistance r38；Described
The emitter stage of audion q311 is directly grounded by described resistance r39, the colelctor electrode of described audion q310 and described audion
The colelctor electrode of q311 is connected with the input of described amplifying circuit.
3. the limiting amplifier that DC maladjustment eliminates function, wherein, described input difference are realized on piece as claimed in claim 2
Amplifier includes audion q31, audion q32, load resistance r31, load resistance r32, feedback resistance r33 and feedback resistance
r34；
The base stage of described audion q31 is connected with described input signal with the base stage of described audion q32；Described audion q31
Colelctor electrode be connected with power supply vdd by described load resistance r31, the colelctor electrode of described audion q32 passes through described load electricity
Resistance r32 is connected with described power supply vdd；The emitter stage of described audion q31 passes through described feedback resistance r33 and described audion
The colelctor electrode of q38 is connected；The emitter stage of described audion q32 passes through the current collection of described feedback resistance r34 and described audion q38
Extremely connected.
4. the limiting amplifier that DC maladjustment eliminates function is realized on piece as claimed in claim 3, wherein, described direct current is born anti-
Feedback amplifier includes audion q33, audion q34, described load resistance r31 and described load resistance r32；
The base stage of the base stage of described audion q33 and described audion q34 is connected with the outfan of described direct current negative-feedback circuit；
The colelctor electrode of described audion q33 is connected with power supply vdd by described load resistance r31；The colelctor electrode of described audion q34 leads to
Cross described load resistance r32 to be connected with described power supply vdd；The emitter stage of described audion q33 and described audion q34 with described
The colelctor electrode of audion q39 is connected.
5. realize on piece as claimed in claim 4 DC maladjustment eliminate function limiting amplifier, wherein, described emitter stage with
Include audion q35 and audion q36 with device；
The base stage of described audion q35 is connected with the colelctor electrode of described audion q31, the base stage of described audion q36 with described
The colelctor electrode of audion q32 is connected, and described audion q35 is connected with power supply vdd with the colelctor electrode of described audion q36, described
The emitter stage of audion q35 and described audion q36 is connected with the input of described amplifying circuit.
6. the limiting amplifier that DC maladjustment eliminates function, wherein, described amplifying circuit are realized on piece as claimed in claim 1
Including some audions, some resistance, electric capacity c41 and electric capacity c42；
The base stage of described audion q41 and described audion q42 is connected with the outfan of described input circuit；
The colelctor electrode of described audion q41 is connected with power supply vdd by described resistance rc1, and the colelctor electrode of described audion q42 leads to
Cross described resistance rc2 to be connected with power supply vdd；The emitter stage of described audion q41 passes through described resistance re1 and described resistance re2
It is connected with the emitter stage of described audion q42；And on described resistance re1 and described resistance re2 described electric capacity c41 in parallel and institute
State electric capacity c42；Described audion q45, described audion q46, described audion q47, described audion q48, described resistance
R41, described resistance r42, described resistance r43 and described resistance r44 constitute current-mirror structure；
Described audion q43 and described audion q44 constitutes emitter follower.
7. the limiting amplifier that DC maladjustment eliminates function, wherein, described resistance rc1 are realized on piece as claimed in claim 6
It is passive component resistor with described resistance rc2.
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| CN201410069481.1A CN103840775B (en) | 2014-02-27 | 2014-02-27 | Limiting amplifier allowing direct-current offset eliminating function to be achieved on sheet |
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| CN201410069481.1A CN103840775B (en) | 2014-02-27 | 2014-02-27 | Limiting amplifier allowing direct-current offset eliminating function to be achieved on sheet |
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| CN103840775B true CN103840775B (en) | 2017-02-01 |
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|---|---|---|---|---|
| CN106487404B (en) * | 2016-11-11 | 2019-04-19 | 成都嘉纳海威科技有限责任公司 | It is a kind of for eliminate output DC maladjustment circuit and method |
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