CN101651449B - Optical input preamplifier for optical communication receiver - Google Patents
Optical input preamplifier for optical communication receiver Download PDFInfo
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- CN101651449B CN101651449B CN2009101950655A CN200910195065A CN101651449B CN 101651449 B CN101651449 B CN 101651449B CN 2009101950655 A CN2009101950655 A CN 2009101950655A CN 200910195065 A CN200910195065 A CN 200910195065A CN 101651449 B CN101651449 B CN 101651449B
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Abstract
The invention discloses an optical input preamplifier for an optical communication receiver, which comprises a photoelectric conversion circuit, a feedback resistor, a Darlington circuit, a common base electrode amplifying circuit, a bias circuit, a difference amplifying circuit and an output buffer circuit, wherein the feedback resistor is connected with the photoelectric conversion circuit; the Darlington circuit is connected with the feedback resistor; the common base electrode amplifying circuit is connected with the Darlington circuit and is driven based on current; the bias circuit is used for providing preset bias voltage; two input ends of the difference amplifying circuit are respectively connected with the common base electrode amplifying circuit and the bias circuit, and the output end of the difference amplifying circuit is connected with the feedback resistor so as to enable the difference amplifying circuit, the feedback resistor, the common base electrode amplifying circuit and the Darlington circuit to form a transresistance negative feedback loop; and the output buffer circuit is connected with the difference amplifying circuit. The optical input preamplifier for the optical communication receiver, which is provided by the invention, has higher optical receiving sensitivity, can be suitable for the reception and the amplification of an outburst optical signal and is also suitable for the reception and the amplification of the traditional continuous signal.
Description
Technical field
The present invention relates to a kind of optical communication and receive field, particularly a kind of optical input preamplifier that is used for optical communication receiver.
Background technology
Usually, the optical input preamplifier that is used for optical communication receiver is to change light signal into the signal of telecommunication in the effect of optical communication system, it generally is made up of a photodiode (PD) and a trans-impedance amplifier (TIA), wherein, photodiode changes the light signal that receives into current signal, changes voltage signal into and amplifies output through trans-impedance amplifier again.Because the transimpedance gain of optical input preamplifier and noise characteristic are the important technology indexs of the receiving sensitivity of decision optical receiver, thereby optical input preamplifier is one of core component of light-receiving and optical communication system.
Traditional optical input preamplifier that is used for optical communication receiver, majority only is applicable to the stochastic equilibrium code stream, and (amplitude, the phase place that are input optical signal are relatively stable, and the reception code stream of the quantity statistics balance of " 0 " and " 1 " in the code stream) is amplified, and be not suitable for burst (be amplitude, phase place and the mark rate of input optical signal---the ratio of " 0 " and " 1 " quantity in the code stream, all in time and fast-changing code stream) reception amplify, such as:
1) application number is 20048003618.5 publication: photo-receiving pre-amplifier, its disclosed amplifier comprises inverting amplifier and is connected current/voltage conversion element between the input and output terminal of this inverting amplifier, above-mentioned inverting amplifier, comprise the first transistor, its grid is connected with the input terminal of above-mentioned inverting amplifier; Transistor seconds, its source electrode are connected with the drain electrode of above-mentioned the first transistor and grid has been applied in predetermined voltage; And load, be connected with the drain electrode of above-mentioned transistor seconds, also comprise the 3rd transistor, be connected between the source electrode of the input terminal of above-mentioned inverting amplifier and above-mentioned transistor seconds.
2) application number is the publication of 93106421.X: preamplifier for super-dynamic-range optical receiver, the input stage of this amplifier adopts the differential type circuit of being made up of the paired field-effect transistor of constant-current source, the total current of gain stage is controlled by constant-current source, reaches the saturated phenomenon that does not occur active device any time with this.
The optical input preamplifier of above-mentioned patent is owing to exist response delay and its lower receiving sensitivity in its circuit, all be difficult to tackle the reception amplification of burst, yet, along with optical communication technique and networks development, the development and application of EPON (PON), light burst-switched (OBS), light packet switch new technologies such as (OPS), the corresponding requirements light receiving pre-amplifier can be applicable to the reception amplification of burst luminous signal, and improves the receiving sensitivity of light receiving pre-amplifier as far as possible.
Therefore, how to provide a kind of and can tackle burst luminous signal and the higher optical input preamplifier of receiving sensitivity, become the problem that those skilled in the art need solve.
Summary of the invention
Technical scheme to be solved of the present invention provides a kind of optical input preamplifier that is used for optical communication receiver, to solve the deficiencies in the prior art.
For solving technique scheme, the invention provides a kind of optical input preamplifier that is used for optical communication receiver, it is characterized in that comprising: photoelectric switching circuit, the light signal that is used for receiving is converted to current signal;
Feedback resistance is connected with described photoelectric switching circuit, is used for the current signal of described photoelectric switching circuit output is converted to voltage signal;
With the Darlington circuit that described feedback resistance is connected, it constitutes Darlington transistor by field-effect transistor and bipolar transistor, is used for described voltage signal is converted to current signal;
The common-base amplification circuit based on current drives that is connected with described Darlington circuit is used for the current signal of described Darlington circuit output is converted to voltage signal;
Biasing circuit is used for providing default bias voltage according to designer's needs;
The differential amplifier circuit that two inputs are connected with described biasing circuit with described common-base amplification circuit respectively, the voltage signal of common-base amplification circuit output amplifies through differential amplifier circuit, feeds back to the input of Darlington circuit through feedback resistance from the negative output end signal of differential amplifier circuit; The output of common-base amplification circuit is connected so that described differential amplifier circuit, feedback resistance, common-base amplification circuit and described Darlington circuit form with the input of the negative of differential amplifier circuit strides the resistance negative feedback loop, and described differential amplifier circuit is used for the voltage signal amplification of described common-base amplification circuit output is converted to complimentary differential signal;
With the output buffer that described differential amplifier circuit is connected, be used for being cushioned back output according to the complimentary differential signal that described differential amplifier circuit is exported in the requirement of subsequent conditioning circuit.
Preferable, the field effect transistor of described Darlington circuit adopts constant-current source as load.
Preferable, when the collector electrode quiescent point electric current of the bipolar transistor of described Darlington circuit is 3-5mA, the internal resistance of described constant-current source is at 500-1000k Ω, the base-emitter junction resistance of described bipolar transistor is when 800 Ω-1.5k Ω, and the equivalent transconductance of described Darlington circuit is 150-200mA/V.
Preferable, described biasing circuit is by two bipolar transistors, three serial regulating circuits that resistance forms, and its output is connected with the noise of electric capacity with the filtering output voltage.
Preferable, described common-base amplification circuit is connected so that provide bias voltage by described biasing circuit with described biasing circuit.
Preferable, described common-base amplification circuit comprises: by first bipolar transistor, first resistance, second bipolar transistor of output voltage signal, second resistance, common-base amplifier with electric capacity formation with the positive phase-shift characterisitc of high frequency, wherein, the collector electrode of described first bipolar transistor connects first resistance, the collector electrode of described second bipolar transistor connects second resistance, and more than the order of magnitude, described electric capacity is connected between the collector electrode of described first bipolar transistor and second bipolar transistor resistance of described first resistance greater than 1 order of magnitude of resistance of described second resistance or 1.
Preferable, described common-base amplification circuit also comprises: by the switching tube that is connected in parallel on the described second resistance two ends, and the antioverloading circuit that forms of a plurality of diodes, during with the output voltage amplitude of the described common-base amplification circuit of box lunch overload, described switching tube conducting is with the voltage signal of the described common-base amplification circuit output that decays.
Preferable, described common-base amplification circuit also comprises: be connected with the output of described second bipolar transistor and the level that is made of resistance and constant-current source is passed circuit, wherein, described level pass circuit the resistance of resistance less than 3 orders of magnitude of internal resistance of constant-current source or 3 more than the order of magnitude.
Preferable, described differential amplifier circuit comprises: feed back the constant-current source circuit that common emitter circuit, bipolar transistor and emitter resistance constitute by voltage negative, wherein, described voltage negative feedback common emitter circuit is used to provide bias voltage, described bipolar transistor provides bias voltage by described voltage negative feedback common emitter circuit, and described emitter resistance is connected described emitter bipolar transistor.
Preferable, described differential amplifier circuit also comprises: cascade transistor of series connection on the difference amplifier transistor that connects input signal, and described cascade transistor is connected with described biasing circuit by a diode, so that the bias voltage of described cascade transistor is higher than described default bias voltage, wherein, described difference amplifier transistor is described differential amplifier circuit difference is amplified one in the pipe.
Preferable, described differential amplifier circuit also comprises respectively with the difference of described differential amplifier circuit and amplifies two emitter followers that the output to pipe is connected, and two emitter followers all are made of bipolar transistor and constant-current source separately.
Preferable, described output buffer comprises: the resistance decrement network that is connected with described differential amplifier circuit output, be connected with described resistance decrement network have the degenerative differential amplifier circuit of voltage and have two emitter followers that the degenerative differential amplifier circuit of voltage is connected with described.
Preferable, the series circuit that described resistance decrement network is made of 3 resistance series connection, and the complimentary differential signal of described differential amplifier circuit output is inserted at the two ends of described series circuit respectively, and the resistance two ends that are in described series circuit centre position have degenerative differential amplifier circuit two inputs of voltage and are connected with described as output.
Preferable, described to have the degenerative differential amplifier circuit of voltage be that voltage gain is less than or equal to 1 differential amplifier circuit.
Preferable, each free bipolar transistor of two emitter followers of described output buffer and load resistance constitute.
One of beneficial effect of the optical input preamplifier that is used for optical communication receiver provided by the invention is to have high open-loop gain and bandwidth, thereby it is compared with traditional light receiving pre-amplifier, has higher optical receiver sensitivity, two of beneficial effect is significantly to reduce various response delays, for example automatic gain is controlled corresponding time delay, difference is amplified thresholding and adjusted time delay etc., thereby its light-receiving that not only is applicable to the stochastic equilibrium signal flow is amplified, be applicable to that also the reception of burst luminous signal is amplified.
Description of drawings
Fig. 1 is the structured flowchart that is used for the optical input preamplifier of optical communication receiver provided by the invention.
Fig. 2 is the above-mentioned circuit diagram that is used for the optical input preamplifier of optical communication receiver.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Please refer to Fig. 1, the optical input preamplifier that is used for optical communication receiver provided by the invention comprise 3, one of Darlington circuits that 2, one on a photodiode 1, feedback resistance (Rf) be made up of field-effect transistor (FET) and bipolar transistor (BT) based on the common-base amplification circuit 4 of current drives, differential amplifier circuit 5, one the biasing circuit 6 of bias voltage is provided and has the degenerative differential amplifier circuit 7 of voltage.
Photodiode only is a preferred version, can substitute by other any public photoelectric switching circuits.
Please refer to Fig. 2, it is the above-mentioned circuit diagram that is used for the optical input preamplifier of optical communication receiver.
The negative pole of photodiode PD is connected to supply voltage source VCC by resistance R 0, provides reverse bias voltage as PD, and C1 is a filtering capacitor.
The positive pole of PD is connected with the grid of field-effect transistor Q1 and the end points of feedback resistance Rf, and PD is converted into current signal with the light signal that receives, and this current signal changes voltage signal into by feedback resistance Rf, and this voltage signal is delivered to the grid of Q1.
Above-mentioned field-effect transistor Q1 and a constant-current source S1 constitute a source follower, and obviously, this source follower has zero Miller effect, thereby very wide frequency response bandwidth is arranged.
A bipolar transistor Q2, its grounded emitter, its base stage is that source electrode is connected with the output of above-mentioned source follower, its collector electrode output current signal.
So, the current signal of above-mentioned bipolar transistor Q2 collector electrode output is ic, and:
i
s+i
BE＝(V
i-i
BE·γ
BE)·gm1
i
s·γ
s＝i
BE·γ
BE
i
c＝β·i
BE
Can draw:
In the formula (1):
V
iFor input optical signal through above-mentioned PD and R
fThe voltage signal of conversion;
Gm
1Be the mutual conductance of above-mentioned field-effect transistor Q1, it is approximately 10～20mA/V;
β is the current amplification factor of above-mentioned bipolar transistor, and its value is about 100～200;
γ
sBe the internal resistance of above-mentioned constant-current source S1, it is approximately 500k Ω～1000k Ω.
i
BEBase current for above-mentioned transistor Q2;
γ
BEBase stage for above-mentioned bipolar transistor Q2---emitter junction resistance, and have:
In the formula (2): gm
2Be the mutual conductance of above-mentioned transistor Q2, setting above-mentioned i
cWhen quiescent point is 3～5mA, γ
BEBe about 800 Ω～1.5k Ω, gm
2Be about 150～200mA/V; Impose a condition down above-mentioned, because i
c=β * i
BEAnd γ
s＞＞γ
BE, and γ
BE* gm1＞＞1, formula (1) can be changed into through simplifying computing so:
i
c≈V
i·gm
2........................................................................(3)
By formula (3) as seen, by above-mentioned field-effect transistor Q1, constant-current source S1 and bipolar transistor Q2 have constituted an approaching desirable Darlington circuit, and its equivalent transconductance is gm, and:
The mutual conductance that can be drawn above-mentioned Darlington circuit by aforementioned calculation can reach 150～200mA/V, the high input impedance advantage that had both had field-effect transistor, overcome the lower shortcoming of silicon-based field-effect transistors mutual conductance again, theory analysis according to transimpedance preamplifier, above-mentioned high input impedance and high gm make light receiving pre-amplifier of the present invention have good low-noise characteristic, thereby have high receiving sensitivity.
Transistor Q3, Q4, resistor R 1, R2 and R3 constitute a serial regulating circuit, from stable setting voltage of the emitter of transistor Q3 output, it provides required setting bias voltage for the aftermentioned multi-level pmultistage circuit, promptly, described serial regulating circuit is a biasing circuit, is used for providing as required bias voltage.The emitter of transistor Q3 and resistor R 1 and R2 polyphone ground connection.Being connected in series of the base stage of transistor Q4 and resistor R 1 and R2 is connected.One end of the collector electrode of transistor Q3 and resistor R 3 is connected to power supply VCC, and the other end of R3 is connected with the base stage of transistor Q3 and the collector electrode of transistor Q4.The emitter of transistor Q3 is by a capacitor grounding, with the noise of this some output setting voltage of this elimination.
Transistor Q5, Q6, resistor R 4, R5 and capacitor C3 primordial are in the common-base amplification circuit of current drives.The base stage of Q5, Q6 is connected with the bias voltage of above-mentioned setting.The emitter of Q5, Q6 is connected with the collector electrode of above-mentioned Q2, and the collector electrode of Q5, Q6 is connected power supply VCC by resistor R 4 respectively with R5, and the two ends of capacitor C3 are connected with the collector electrode of Q5, Q6 respectively.
By above-mentioned connection, the common-base amplification circuit that constitutes by the first bipolar transistor Q5, the second bipolar transistor Q6, first resistance R 4, second resistance R 5 and C3 based on current drives, change the current signal of above-mentioned Q2 collector electrode output into voltage signal, this voltage signal is from the collector electrode output of Q6.Because wherein the resistance value of R4 is than the big at least order of magnitude of resistance value of R5, C3 is a little electric capacity, then the common-base amplification circuit of said structure has the positive phase-shift characterisitc of high frequency, be that high fdrequency component in the voltage signal on the resistance R 4 is coupled on the collector electrode and resistance R 5 of Q6 through C3, thereby make the voltage signal of above-mentioned common-base amplification circuit output produce a Phase advance, further improve its response speed with this.And, because common-base amplification circuit has negative Miller effect, so the common-base amplification circuit of said structure has very high gain band width product, help improving the transimpedance gain of light receiving pre-amplifier of the present invention and reduce circuit noise, improve optical receiver sensitivity.
Common-base amplification circuit also includes a transistor Q7, resistor R 6 and two antioverloading circuit that diode D1, D2 constitute, and the emitter and collector of transistor Q7 is in parallel with above-mentioned resistor R 5.One end of resistor R 6 is connected mutually with two diode D1, D2, another termination power VCC of R6, the negative pole of D2 is connected with above-mentioned setting bias voltage, and the base stage of Q7 is connected with the positive pole of diode D1, only for raising bias voltage usefulness, its quantity is not limited to 2 for diode D1, D2.
According to above-mentioned connection, when input optical signal amplitude hour, the correspondent voltage signal amplitude is also little on the resistor R 5, not conducting of transistor Q7, and the parallel impedance of R5 and Q7 equals R5, and the voltage gain of above-mentioned common-base amplifier is for setting maximum.When the input optical signal amplitude was big, the correspondent voltage signal amplitude was also big on the resistor R 5, transistor Q7 conducting, and the parallel impedance of R5 and Q7 reduces, thereby the output voltage signal of above-mentioned common-base amplifier is attenuated, and avoids follow up amplifier input overload with this.
A resistor R 7, the one end is connected with the collector electrode of transistor Q6, and the constant-current source S2 of its other end and a ground connection is connected in series.
Constitute a level according to above-mentioned connection resistor R 7 with constant-current source S2 and pass circuit.Constant-current source S2 provides the constant current R7 that flows through to produce a voltage drop.Derive from the voltage signal of above-mentioned common-base amplification circuit output from resistor R 7 and the series connection node of constant-current source S2, its input service point with follow-up amplifying circuit is mated.Because the internal resistance of the resistance value ratio constant-current source S2 of resistor R 7 is 3 orders of magnitude extremely when young, above-mentioned voltage signal can not be attenuated through behind the R7.Realize the level passing with said method, the method than pass level usually with emitter follower is characterized in that additional noise is little, helps improving the noise characteristic of light receiving pre-amplifier of the present invention, thereby improves optical receiver sensitivity.
Transistor Q8, Q9, Q10, Q11, Q12, resistor R 8, R9, R10, R11, R12, R13, R14 and a diode D3 constitute a differential amplifier circuit.Wherein the emitter of Q8, Q9 is connected with the collector electrode of Q10, and the emitter of Q10 is by resistor R 8 ground connection.The emitter of Q11 is connected with the collector electrode of Q8, and the collector electrode of Q11 connects power supply VCC by resistance R 9.The base stage of Q11 is connected with an end of resistor R 10 and the positive pole of diode D3.Another termination power VCC of resistor R 10.The negative pole of diode D3 is connected with above-mentioned setting bias voltage.The collector electrode of Q9 connects power supply VCC by resistor R 11.The base stage of Q9 connects the bias voltage of above-mentioned setting.The base stage of Q10 is connected with the collector electrode of Q12.The collector electrode of Q12 connects power supply VCC by resistor R 12.The base stage of Q12 is connected by the collector electrode of resistance R 14 and Q12.The emitter of Q12 is by resistance R 13 ground connection.The base stage of transistor Q8 and transistor Q9 base stage are respectively as two inputs of this differential amplifier.Wherein the base stage of Q8 is connected as the node that is connected in series of signal input part with above-mentioned R7 and constant-current source S2, and the base stage of Q9 connects the bias voltage of stating setting.By the above-mentioned differential amplifier circuit that connects and composes, following advantage is arranged:
The constant-current source of this differential amplifier circuit partly comprises a constant current output transistor Q10, its emitter-base bandgap grading series resistance R8, and as emitter resistance, and a voltage negative feedback common emitter circuit of being made up of transistor Q12, resistor R 12, R13, R14 is formed.Wherein above-mentioned voltage negative feedback common emitter circuit specially for transistor Q10 provide appropriate bias voltage with guarantee Q10 stable provide constant current for above-mentioned differential amplifier circuit.The difference of said structure is amplified constant-current source and is had good ambient temperature compensation characteristic and anti-process deviation ability.
In the differential amplifier circuit, difference amplifier transistor Q8 and difference amplifier transistor Q9 have constituted difference and have amplified pipe, and wherein, transistor Q8 connects with cascade transistor Q11, constitutes a cascade circuit.By diode D3 the bias voltage of above-mentioned setting is improved the base bias voltage of about 0.8V as cascade transistor Q11.This cascade circuit effectively overcomes the Miller effect of transistor Q8 base stage input, thereby has improved above-mentioned differential amplifier circuit response speed, has just improved the gain band width product of this differential amplifier circuit.The high gain-bandwidth product of this differential amplifier circuit further improves the transimpedance gain of light receiving pre-amplifier of the present invention, and improves its noise characteristic, thereby improves its optical receiver sensitivity.
The single-phase voltage signal of above-mentioned common-base amplification circuit output inputs to above-mentioned differential amplifier circuit through the base stage of above-mentioned transistor Q8, after above-mentioned differential amplifier circuit amplifies once more, change complementary differential voltage signal into, and export from the collector electrode of Q11 and Q9 respectively.Wherein export positive phase voltage signal from the Q11 collector electrode.From Q9 collector electrode output reverse voltage signal, in the voltage signal phase place of this indication, its reference point is the phase place of above-mentioned field-effect transistor Q1 gate input voltage signal, promptly is all positive mutually with its phase place, and opposite with it is negative.
A transistor Q13, its emitter is connected with the constant-current source S3 of a ground connection, and its collector electrode connects power supply VCC, and its base stage is connected with the collector electrode of Q9, constitutes an emitter follower.The negative phase voltage signal of then above-mentioned differential amplifier output is exported through the emitter from Q13 behind this emitter follower.The end of above-mentioned feedback resistance Rf and the output of this emitter follower are that the emitter of Q13 is connected.The other end of Rf is connected with the grid of above-mentioned field-effect transistor Q1.So far, constituted the connection of striding the resistance negative feedback loop of optical input preamplifier of the present invention.
Stride under the effect that hinders negative feedback loop above-mentioned, the signal input part of above-mentioned differential amplifier is that the base stage quiescent voltage working point of transistor Q8 is adjusted to automatically with the base voltage of transistor Q9 and equated, promptly adjust to above-mentioned setting bias voltage, and respond input signal fast.Therefore above-mentioned differential amplifier circuit has good equilibrium response, and having overcome common single-phase signal transition is that the difference that the complementary diphase signal of difference is produced is amplified thresholding adjustment time delay.That is to say that the above-mentioned resistance loop of striding is applicable to that not only the reception of traditional stochastic equilibrium signal flow is amplified, also be applicable to the reception amplification of the burst of big ups and downs at random of input signal stream energy.
Another transistor Q14, its emitter is connected with the constant-current source S4 of a ground connection, and its collector electrode connects power supply VCC, and its base stage and the collector electrode of above-mentioned transistor Q11 are that the positive output point of above-mentioned differential amplifier is connected.Then constitute an emitter follower by Q14 and constant-current source S4, the positive phase voltage signal of above-mentioned differential amplifier circuit output through behind this emitter follower from the output that is connected in series of Q14 and constant-current source S4.
Transistor Q15, Q16, Q17, Q18, Q19 and resistor R 15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27 constitute the buffering output circuit of optical input preamplifier of the present invention.This buffering output circuit comprises that a resistance decrement network, one have the degenerative differential amplifier circuit of voltage and two emitter followers.Wherein resistor R 15, R16 and R17 are connected in series successively, the output point of the emitter follower that the other end of R15 and above-mentioned transistor Q13 and constant-current source S3 constitute is that the emitter of Q13 is connected, and another end of R17 and the output point of the emitter follower of above-mentioned transistor Q14 and constant-current source S4 formation are that the emitter of Q14 is connected.So, constitute a resistance decrement network, draw at the two ends of resistor R 16 after the difference complementary voltage signal attenuation with above-mentioned two emitter followers output by R15, R16 and R17.The base stage of transistor Q15, Q16 is connected with the two ends of resistor R 16 respectively, and its emitter is connected with the collector electrode of transistor Q17, and the emitter of Q17 is by resistor R 21 ground connection.The end of resistor R 18, R19 connects respectively at the collector electrode of transistor Q15, Q16, and the other end of R18, R19 interconnects, and connects power supply VCC by resistor R 20.The two ends of resistor R 22 are connected with base stage with the collector electrode of transistor Q15 respectively, and the two ends of resistor R 23 are connected with base stage respectively at the collector electrode of transistor Q16.The collector electrode of transistor Q18 meets power supply VCC, and its emitter is by resistor R 27 ground connection, and its base stage is connected with the collector electrode of transistor Q16.The collector electrode of transistor Q19 connects power supply VCC, and its emitter is by resistance R 26 ground connection, and its base stage is connected with the collector electrode of transistor Q15.The two ends of resistor R 24 are connected with the base stage of transistor Q17 and the emitter of transistor Q19 respectively.The two ends of resistor R 25 are connected with the base stage of transistor Q17 and the emitter of transistor Q18 respectively.According to the above-mentioned buffering output circuit that connects and composes, have the following advantages:
Above-mentioned complementary differential voltage signal of striding resistance feedback loop output, the attenuation network of forming via resistor R 15, R16, R17 are sent to by what transistor Q15, Q16, Q17 and resistor R 18, R19, R20, R21, R22, R23 etc. formed has a degenerative differential amplifier circuit of voltage.Signal level after the decay guarantees that follow-up differential amplifier better is operated in the range of linearity.
Be connected the base stage of output emitter follower and transistor Q17 with R25 by resistor R 24, wherein R24 equates with the R25 resistance, and constituting a direct current negative feedback network provides bias voltage for the base stage of Q17, thereby stablizes the collector electrode output current of Q17.
Parameters such as collector current by the above-mentioned resistor R 15 of choose reasonable, R16, R17, R18, R19, R22, R23 and transistor Q17, make the voltage gain of this buffering output circuit be less than or equal to 1 (0dB), guarantee the gain symmetry characteristic of this circuit output complimentary differential signal with this, reduce the direct voltage deviation of complementary output, and can effectively improve the signal to noise ratio of output signal.
Load resistance R26, the R27 that transistor Q18, Q19 and two emitter-base bandgap grading are connected over the ground constitutes the positive negative output emitter follower of complimentary differential signal respectively, wherein the emitter of Q18 is exported positive phase voltage signal OP, the emitter output negative phase voltage signal ON of Q19.
By resistor R 20, suitably reduce the quiescent voltage working point of circuit output end, reduce the static working current of transistor Q18, Q19 with this, avoid its current overload, can realize simultaneously output direct-current coupling over the ground Low ESR (for example 50 Ω, 75 Ω) connect, thereby improved the driving force of light receiving pre-amplifier of the present invention to subsequent conditioning circuit, convenient test and use are applicable to that especially the reception of burst is amplified.
In sum, striding in the resistance optical input preamplifier of a kind of new structure provided by the invention, a photodiode changes input optical signal into current signal, and this current signal is flowed through and striden voltage signal of resistance Rf generation.Constitute a Darlington circuit by an enhancement mode field effect transistor FET, a constant-current source and a bipolar transistor, this Darlington circuit will be striden the voltage signal that hinders upward generation and will be converted to current signal, and its electric current and voltage conversion efficiency (being mutual conductance) gm reaches 150～200mA/V.The current signal of Darlington circuit output is converted to voltage signal through the common-base circuit of a current drives, and this voltage signal amplifies through a differential amplifier circuit again.The input of the negative output signal of differential amplifier circuit through striding resistance Rf and feeding back to above-mentioned Darlington circuit is the grid of FET.So by above-mentioned Darlington circuit, the common-base amplification circuit of current drives, differential amplifier circuit and feedback resistance Rf just form striding of a new structure and hinder the light receiving pre-amplifier loop; Be characterized in that open-loop gain can be greater than 200 times, the input equivalent transconductance reaches 150～200mA/V.The appropriate design of its circuit at different levels utilizes zero Miller effect and negative Miller effect to reach best open-loop bandwidth.Its response delay is little of ignoring.Because the These characteristics in this transimpedance preamplifier loop makes the optical input preamplifier of new structure provided by the invention be achieved the target that improves optical receiver sensitivity and respond the input optical signal rheologyization fast.That is to say that compare with traditional resistance optical input preamplifier of striding, the resistance optical input preamplifier of striding of new structure provided by the invention has higher optical receiver sensitivity.And its reception that not only is applicable to stochastic equilibrium torrent of light (being input optical signal stream energy time domain distribution statistics signal flow stably) is amplified, and is applicable to that also the reception of the burst luminous signal of input optical signal stream energy time domain distribution statistics rapid fluctuations is amplified.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only.Any modification or partial replacement that does not break away from spirit and scope of the invention all should be encompassed in the middle of the claim scope of the present invention.
Claims (15)
1. optical input preamplifier that is used for optical communication receiver is characterized in that comprising:
Photoelectric switching circuit, the light signal that is used for receiving is converted to current signal;
Feedback resistance is connected with described photoelectric switching circuit, is used for the current signal of described photoelectric switching circuit output is converted to voltage signal;
With the Darlington circuit that described feedback resistance is connected, it constitutes Darlington transistor by field-effect transistor and bipolar transistor, is used for described voltage signal is converted to current signal;
The common-base amplification circuit based on current drives that is connected with described Darlington circuit is used for the current signal of described Darlington circuit output is converted to voltage signal;
Biasing circuit is used for providing default bias voltage according to designer's needs;
The differential amplifier circuit that two inputs are connected with described biasing circuit with described common-base amplification circuit respectively, the voltage signal of common-base amplification circuit output amplifies through differential amplifier circuit, feeds back to the input of Darlington circuit through feedback resistance from the negative output end signal of differential amplifier circuit; The output of common-base amplification circuit is connected so that described differential amplifier circuit, feedback resistance, Darlington circuit and common-base amplification circuit form with the input of the negative of differential amplifier circuit strides the resistance negative feedback loop, and described differential amplifier circuit is used for the voltage signal amplification of described common-base amplification circuit output is converted to complimentary differential signal;
With the output buffer that described differential amplifier circuit is connected, be used for being cushioned back output according to the complimentary differential signal that described differential amplifier circuit is exported in the requirement of subsequent conditioning circuit.
2. the optical input preamplifier that is used for optical communication receiver as claimed in claim 1 is characterized in that: the field effect transistor of described Darlington circuit adopts constant-current source as load.
3. the optical input preamplifier that is used for optical communication receiver as claimed in claim 2, it is characterized in that: the collector electrode quiescent point electric current of the bipolar transistor of described Darlington circuit is 3-5mA, the internal resistance of described constant-current source is at 500-1000k Ω, the base-emitter junction resistance of described bipolar transistor is at 800 Ω-1.5k Ω, and the equivalent transconductance of described Darlington circuit is 150-200mA/V.
4. the optical input preamplifier that is used for optical communication receiver as claimed in claim 1, it is characterized in that: described biasing circuit is by two bipolar transistors, three serial regulating circuits that resistance forms, and its output is connected with the noise of electric capacity with the filtering output voltage.
5. the optical input preamplifier that is used for optical communication receiver as claimed in claim 4 is characterized in that: described common-base amplification circuit is connected so that provide bias voltage by described biasing circuit with described biasing circuit.
6. the optical input preamplifier that is used for optical communication receiver as claimed in claim 5, it is characterized in that: described common-base amplification circuit comprises: by first bipolar transistor, first resistance, second bipolar transistor of output voltage signal, second resistance, common-base amplifier with electric capacity formation with the positive phase-shift characterisitc of high frequency, wherein, the collector electrode of described first bipolar transistor connects first resistance, the collector electrode of described second bipolar transistor connects second resistance, and more than the order of magnitude, described electric capacity is connected between the collector electrode of described first bipolar transistor and second bipolar transistor resistance of described first resistance greater than 1 order of magnitude of resistance of described second resistance or 1.
7. the optical input preamplifier that is used for optical communication receiver as claimed in claim 6, it is characterized in that: described common-base amplification circuit also comprises: by the switching tube that is connected in parallel on the described second resistance two ends, and the antioverloading circuit that forms of a plurality of diodes, during with the output voltage amplitude of the described common-base amplification circuit of box lunch overload, described switching tube conducting is with the voltage signal of the described common-base amplification circuit output that decays.
8. the optical input preamplifier that is used for optical communication receiver as claimed in claim 6, it is characterized in that: described common-base amplification circuit also comprises: be connected with the output of described second bipolar transistor and the level that is made of resistance and constant-current source is passed circuit, wherein, described level pass circuit the resistance of resistance less than 3 orders of magnitude of internal resistance of constant-current source or 3 more than the order of magnitude.
9. the optical input preamplifier that is used for optical communication receiver as claimed in claim 1, it is characterized in that: described differential amplifier circuit comprises: feed back the constant-current source circuit that common emitter circuit, bipolar transistor and emitter resistance constitute by voltage negative, wherein, described voltage negative feedback common emitter circuit is used to provide bias voltage, described bipolar transistor provides bias voltage by described voltage negative feedback common emitter circuit, and described emitter resistance is connected described emitter bipolar transistor.
10. the optical input preamplifier that is used for optical communication receiver as claimed in claim 9, it is characterized in that: described differential amplifier circuit also comprises: cascade transistor of series connection on the difference amplifier transistor that connects input signal, and described cascade transistor is connected with described biasing circuit by a diode, so that the bias voltage of described cascade transistor is higher than described default bias voltage, wherein, described difference amplifier transistor is described differential amplifier circuit difference is amplified one in the pipe.
11. the optical input preamplifier that is used for optical communication receiver as claimed in claim 9, it is characterized in that: described differential amplifier circuit also comprises respectively with the difference of described differential amplifier circuit and amplifies two emitter followers that the output to pipe is connected, and two emitter followers all are made of bipolar transistor and constant-current source separately.
12. the optical input preamplifier that is used for optical communication receiver as claimed in claim 1 is characterized in that: described output buffer comprises: the resistance decrement network that is connected with described differential amplifier circuit output, be connected with described resistance decrement network have the degenerative differential amplifier circuit of voltage and have two emitter followers that the degenerative differential amplifier circuit of voltage is connected with described.
13. the optical input preamplifier that is used for optical communication receiver as claimed in claim 12, it is characterized in that: the series circuit that described resistance decrement network is made of three resistance series connection, and the complimentary differential signal of described differential amplifier circuit output is inserted at the two ends of described series circuit respectively, and the resistance two ends that are in described series circuit centre position have degenerative differential amplifier circuit two inputs of voltage and are connected with described as output.
14. the optical input preamplifier that is used for optical communication receiver as claimed in claim 12 is characterized in that: described to have the degenerative differential amplifier circuit of voltage be that voltage gain is less than or equal to 1 differential amplifier circuit.
15. the optical input preamplifier that is used for optical communication receiver as claimed in claim 12 is characterized in that: each free bipolar transistor of two emitter followers of described output buffer and load resistance constitute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101950655A CN101651449B (en) | 2009-09-03 | 2009-09-03 | Optical input preamplifier for optical communication receiver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101950655A CN101651449B (en) | 2009-09-03 | 2009-09-03 | Optical input preamplifier for optical communication receiver |
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| CN101651449A CN101651449A (en) | 2010-02-17 |
| CN101651449B true CN101651449B (en) | 2011-06-15 |
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| CN2009101950655A Expired - Fee Related CN101651449B (en) | 2009-09-03 | 2009-09-03 | Optical input preamplifier for optical communication receiver |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN106559143A (en) * | 2015-09-29 | 2017-04-05 | 青岛海信宽带多媒体技术有限公司 | Optical module |
| JP6571518B2 (en) * | 2015-12-24 | 2019-09-04 | エイブリック株式会社 | Differential amplifier circuit |
| JP6560825B2 (en) * | 2016-06-20 | 2019-08-14 | 日本電信電話株式会社 | Optical receiver |
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| CN107066414B (en) * | 2017-04-25 | 2023-12-29 | 南京国电南自维美德自动化有限公司 | Enhanced parallel communication circuit and method |
| DE102017111197A1 (en) * | 2017-05-23 | 2018-11-29 | Sicoya Gmbh | Transimpedance amplifier circuit |
| CN107231132A (en) * | 2017-07-25 | 2017-10-03 | 杭州洪芯微电子科技有限公司 | Burst mode trans-impedance amplifier |
| US10491166B2 (en) * | 2018-03-01 | 2019-11-26 | Semiconductor Components Industries, Llc | Low noise differential amplifier |
| CN109510598A (en) * | 2018-11-16 | 2019-03-22 | 淮阴工学院 | A kind of high sensitivity wide dynamic range photoreceiver pre-amplification circuit |
| CN112039452B (en) * | 2020-09-07 | 2022-08-23 | 电子科技大学 | Broadband trans-impedance amplifier |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5166819A (en) * | 1989-02-23 | 1992-11-24 | Alcatel N.V. | Front end for a broadband optical receiver |
| CN1077829A (en) * | 1993-06-04 | 1993-10-27 | 北京航空航天大学 | Preamplifier for super-dynamic-range optical receiver |
| US6806778B1 (en) * | 2003-02-18 | 2004-10-19 | Sirenza Microdevices, Inc. | Darlington cascode |
| CN1890874A (en) * | 2003-12-03 | 2007-01-03 | 松下电器产业株式会社 | Photo-receiving pre-amplifier |
| CN201207034Y (en) * | 2008-02-01 | 2009-03-11 | 凯迈（洛阳）测控有限公司 | Photoelectric conversion pre-amplifier circuit |
-
2009
- 2009-09-03 CN CN2009101950655A patent/CN101651449B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5166819A (en) * | 1989-02-23 | 1992-11-24 | Alcatel N.V. | Front end for a broadband optical receiver |
| CN1077829A (en) * | 1993-06-04 | 1993-10-27 | 北京航空航天大学 | Preamplifier for super-dynamic-range optical receiver |
| US6806778B1 (en) * | 2003-02-18 | 2004-10-19 | Sirenza Microdevices, Inc. | Darlington cascode |
| CN1890874A (en) * | 2003-12-03 | 2007-01-03 | 松下电器产业株式会社 | Photo-receiving pre-amplifier |
| CN201207034Y (en) * | 2008-02-01 | 2009-03-11 | 凯迈（洛阳）测控有限公司 | Photoelectric conversion pre-amplifier circuit |
Non-Patent Citations (1)
| Title |
|---|
| JP平1-270402A 1989.10.27 |
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