CN102723944B - A kind of method and circuit single-ended signal being converted to differential signal - Google Patents
A kind of method and circuit single-ended signal being converted to differential signal Download PDFInfo
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- CN102723944B CN102723944B CN201210228956.8A CN201210228956A CN102723944B CN 102723944 B CN102723944 B CN 102723944B CN 201210228956 A CN201210228956 A CN 201210228956A CN 102723944 B CN102723944 B CN 102723944B
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Abstract
The invention discloses a kind of method and the circuit that single-ended signal are converted to differential signal, comprise trans-impedance amplifier, high pass filter, AC coupled resistance, direct-flow biasing circuit, electric capacity of voltage regulation and Schmidt trigger.Trans-impedance amplifier connects high pass filter; High pass filter connects Schmidt trigger input; Schmidt trigger be connected electric capacity of voltage regulation between another input with ground wire; AC coupled resistance is arranged between two inputs of Schmidt trigger; Described direct-flow biasing circuit is connected between two outputs of Schmidt trigger, for providing direct-current working volts for Schmidt trigger two inputs, makes the direct-current working volts of Schmidt trigger two inputs tend to equal.The most obvious advantage of the present invention is adopted to be not only be applicable to continuous mode trans-impedance amplifier but also be applicable to burst mode trans-impedance amplifier.
Description
Technical field
The present invention relates to electronic circuit field, in particular a kind of method and circuit single-ended signal being converted to differential signal.
Background technology
Trans-impedance amplifier current signal is changed into voltage signal and the electronic circuit amplified.One of its modal purposes is the preamplifier for photelectric receiver in opto-electronic communications technology.Two kinds of mode of operations are had, i.e. continuous mode and burst mode for the trans-impedance amplifier in communicate optical signal receiver.Under burst mode, signal stream is intermittent type, has pause between the segment signal of front and back two, and the intensity of every segment signal can have larger difference.Burst mode functional requirement is a new challenge this for trans-impedance amplifier.Meanwhile, along with the raising of optical communication network speed, the signal of telecommunication be transformed through light signal generally all needs the form adopting difference.Output signal is this requirement of difference form is also another challenge that the design of burst mode trans-impedance amplifier runs into.
Light signal amplifies with trans-impedance amplifier the signal of telecommunication produced through photodiode conversion and is generally single-ended non-differential signal.Single-ended signal comprises direct current and exchanges two parts.Wherein AC portion carries the communication information, and direct current component is only relevant with amplifier architecture irrelevant with signal of communication.Differential signal generally only comprises the communication information, and its direct current component is similar to zero.Single-ended signal being converted to differential signal normally utilizes a DC restoration circuit to complete.The effect of DC restoration circuit utilizes negative feedback loop to produce a DC reference voltage equal or close with single-ended signal DC component.Single-ended signal and DC reference voltage are connected to the input of differential amplifier, output signal just becomes differential signal simultaneously.Existing burst mode trans-impedance amplifier is exactly on the basis of above-mentioned DC restoration circuit structure, increase a negative feedback loop time constant selector switch S to realize (as shown in Figure 1) of difference output translation function.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of method and the circuit that single-ended signal are converted to differential signal, the trans-impedance amplifier being intended to solve existing continuous mode and burst mode can not be used mutually, and needs on the basis of DC restoration circuit structure, increase the problem that a negative feedback loop time constant selector switch realizes difference output translation function for the trans-impedance amplifier of burst mode of operation.
Technical scheme of the present invention is as follows:
Single-ended signal is converted to a method for differential signal, wherein,
First utilize the flip-flop in high pass filter elimination single-ended signal; Single-ended signal is carried on difference Schmidt trigger by recycling AC coupled resistance, the difference conversion of the direct-current working volts settling signal that the trend that last difference Schmidt trigger input at input according to direct-flow biasing circuit is equal.
Single-ended signal is converted to a circuit for differential signal, it comprises trans-impedance amplifier, high pass filter, AC coupled resistance, direct-flow biasing circuit, electric capacity of voltage regulation and Schmidt trigger.Trans-impedance amplifier connects high pass filter; High pass filter connects Schmidt trigger input; Schmidt trigger be connected electric capacity of voltage regulation between another input with ground wire; AC coupled resistance is arranged between two inputs of Schmidt trigger; Described direct-flow biasing circuit is connected between two inputs of Schmidt trigger, for providing direct-current working volts for Schmidt trigger two inputs, the direct-current working volts of Schmidt trigger two inputs are made to tend to equal, signal, for eliminating the flip-flop in single-ended signal, is inputted Schmidt trigger by described high pass filter; Described Schmidt trigger tends to equal direct-current working volts according to input and the single-ended signal of input is treated to differential signal.
Described circuit single-ended signal being converted to differential signal, wherein, described Schmidt trigger is difference Schmidt trigger.
Described circuit single-ended signal being converted to differential signal, wherein, the input stage of Schmidt trigger is CMOS tube or or bipolar transistor.
Described circuit single-ended signal being converted to differential signal, wherein, when the input stage of Schmidt trigger is CMOS tube, AC coupled resistance between two inputs of Schmidt trigger is merged into a resistance and is connected across between two inputs of Schmidt trigger, described direct-flow biasing circuit is connected directly between any one end of this resistance, the electric capacity of high pass filter connects the output of trans-impedance amplifier, Schmidt trigger input connects the output of high pass filter, and another input is by electric capacity of voltage regulation ground connection.
Described circuit single-ended signal being converted to differential signal, wherein, increases first stage amplifier in the front end of Schmidt trigger, for improving the working range of whole circuit.
Described circuit single-ended signal being converted to differential signal, wherein, the amplifier increased in the front end of Schmidt trigger is differential amplifier.
Beneficial effect of the present invention: the present invention is by first utilizing the flip-flop in high pass filter erasure signal, and the difference of recycling difference Schmidt trigger settling signal transforms.New method the most significantly advantage is that this differential signal method for transformation is not only applicable to continuous mode trans-impedance amplifier but also be applicable to burst mode trans-impedance amplifier.That is the trans-impedance amplifier of this method design is utilized compatiblely to apply with burst two kinds continuously.In burst mode application, this trans-impedance amplifier is without the need to external control signal of the prior art.
Accompanying drawing explanation
Fig. 1 is the difference transferring structure of existing burst mode trans-impedance amplifier.
Fig. 2 is the theory diagram of circuit provided by the invention.
Fig. 3 is the circuit theory diagrams of preferred embodiment one provided by the invention.
Fig. 4 is the circuit theory diagrams of preferred embodiment two provided by the invention.
Fig. 5 be the embodiment of the present invention basis on improve further after circuit theory diagrams.
Fig. 6 is the signal waveforms of processing of circuit provided by the invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.
Difference conversion circuit for burst mode trans-impedance amplifier provided by the invention comprises trans-impedance amplifier, high pass filter, AC coupled resistance, direct-flow biasing circuit, electric capacity of voltage regulation and Schmidt trigger.Described Schmidt trigger is difference Schmidt trigger, and the input stage of Schmidt trigger both can be CMOS also can be bipolar transistor (BJT).An input of Schmidt trigger is connected electric capacity of voltage regulation with between ground wire GND, and for high-frequency signal, this node is equivalent to ground connection.Another input of Schmidt trigger is connected with the output of high pass filter.The resistance connected between Schmidt trigger two inputs is AC coupled resistance.The output signal of high pass filter is directly added between two inputs of difference Schmidt trigger.Described direct-flow biasing circuit is connected on AC coupled resistance, for providing direct-current working volts for Schmidt trigger two inputs.Direct-flow biasing circuit can have multiple implementation method, and prerequisite makes the direct-current working volts of Schmidt trigger two inputs close or equal.For difference Schmidt trigger, input high-frequency signal is provided by high pass filter, and direct-current working volts are provided by bias circuit, and therefore its working method is coupled do not have what substantive difference with fully differential.Circuit provided by the invention can be implemented with typical integrated circuit engineering, also can implement with discrete component.
Described difference Schmidt trigger is the high-speed comparator with lagging characteristics.The output of Schmidt trigger has two stable states: one is export high level state; Another is output low level state.Its state is maintained by the current potential of input signal, its trigger process, the input mode namely causing trigger to transform between two output states also has two kinds of changes: forward triggers (current potential forward increases progressively rising edge) and negative sense and triggers (negative sense successively decrease trailing edge).The input potential value (i.e. trigger threshold voltage) of two kinds of trigger process generations is different, is called forward threshold voltage and negative sense threshold voltage.
Input signal rises to from low level the input voltage the process of high level, circuit state being changed and is called forward threshold voltage; Input signal drops to from high level the input voltage low level process, circuit state being changed and is called negative sense threshold voltage.Forward threshold voltage is generally greater than negative sense threshold voltage, and the difference of forward threshold voltage and negative sense threshold voltage is called that voltage is sluggish.
Its initial condition exported also is depended in the response of Schmidt trigger to the pulse of forward unit width, the pulse of negative sense unit width and middle bit level three kinds of elements.If initial condition is high level state, when running into the pulse of forward unit width, output state is just constant, namely keeps its original high level state; Export when running into the pulse of negative sense unit width and just overturn, become low level state.Otherwise, if initial condition is low level state, when running into the pulse of negative sense unit width, exporting with regard to low level state that is constant or that keep it original, exporting when running into the pulse of forward unit width and just overturn, become high level state.When input is in meta level, Schmidt trigger just keeps its existing state always.
See Fig. 3, for the preferred embodiment of the invention one, first signal enters high-pass filtering electric capacity C2 after trans-impedance amplifier, from an input of the direct input difference Schmidt trigger of the output of this high pass filter, between two inputs of Schmidt trigger, be connected with the first AC coupled resistance R1 and the second AC coupled resistance R2.Schmidt trigger be connected with electric capacity of voltage regulation C1 between another input and ground wire.Direct-flow biasing circuit is connected with between the first AC coupled resistance R1 and the second AC coupled resistance R2.The signal of input is directly carried between two inputs of Schmidt trigger, is differential signal by the process of described Schmidt trigger.
When the input stage of Schmidt trigger is CMOS tube, the present invention also provides preferred embodiment two as shown in Figure 4, input stage due to Schmidt trigger is CMOS tube, first AC coupled resistance R1 of series connection and the second AC coupled resistance R2 merges into the first resistance R and is connected across between two inputs of Schmidt trigger, described direct current (DC) bias can be added in any one end of this resistance R, i.e. on any one input of Schmidt trigger.Schmidt trigger input connects the output of high pass filter, and another input is by electric capacity of voltage regulation C1 ground connection.
Under some application conditions, the difference conversion circuit of described trans-impedance amplifier can also be optimized further.As shown in Figure 5, first stage amplifier is increased in the front end of Schmidt trigger in order to improve the working range of whole circuit.This amplifier is also differential amplifier.
To sum up all circuit, are of the present inventionly summarized as a kind of method single-ended signal being converted to differential signal, and its treatment step is: first utilize the flip-flop in high pass filter erasure signal; The difference of recycling difference Schmidt trigger settling signal transforms.
Described high pass filter is equivalent to step detector in time domain.See Fig. 6, when the rising edge of appearance on signal waveforms a, the direct impulse of a unit width will be there is in the rear end of high pass filter; Otherwise, when the trailing edge of appearance on signal waveforms a, the negative-going pulse of a unit width will be there is in the rear end of AC coupled resistance; And in the time period not having step, i.e. the horizontal segment of signal waveform a, will remain unchanged at middle bit level in the back end signal of AC coupled resistance.So the signal waveform after described high pass filter and ac-coupled device just becomes and is made up of, as shown in the b waveform in Fig. 6 the negative-going pulse of the direct impulse of unit width, unit width arteries and veins and middle bit level three kinds of elements.
Schmidt trigger will to produce after ac-coupled device and high pass filter, the waveform be made up of the direct impulse of unit width, the negative-going pulse of unit width and middle bit level three kinds of elements changes into the waveform input signal that amplitude is amplified, as shown in waveform c in Fig. 6.
The present invention proposes a kind of method and the implementing circuit structure that single-ended signal are converted to differential signal.It is first utilize the flip-flop in high pass filter erasure signal that this differential signal transforms new method, and the difference of recycling difference Schmidt trigger settling signal transforms.When for trans-impedance amplifier, this method of inventing the most significantly advantage is not only applicable to continuous mode trans-impedance amplifier but also be applicable to burst mode trans-impedance amplifier.That is the trans-impedance amplifier of this method design is utilized compatiblely to apply with burst two kinds continuously.In burst mode application, this trans-impedance amplifier is without the need to external control signal of the prior art.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and all these improve and convert the protection range that all should belong to claims of the present invention.
Claims (6)
1. single-ended signal is converted to a circuit for differential signal, it is characterized in that, comprise trans-impedance amplifier, high pass filter, AC coupled resistance, direct-flow biasing circuit, electric capacity of voltage regulation and Schmidt trigger, trans-impedance amplifier connects high pass filter; High pass filter connects Schmidt trigger input; Schmidt trigger be connected electric capacity of voltage regulation between another input with ground wire; AC coupled resistance is arranged between two inputs of Schmidt trigger; Described direct-flow biasing circuit is connected between two inputs of Schmidt trigger, for providing direct-current working volts for Schmidt trigger two inputs, the direct-current working volts of Schmidt trigger two inputs are made to tend to equal, signal, for eliminating the flip-flop in single-ended signal, is inputted Schmidt trigger by described high pass filter; Described Schmidt trigger tends to equal direct-current working volts according to input and the single-ended signal of input is treated to differential signal.
2. circuit single-ended signal being converted to differential signal according to claim 1, is characterized in that, described Schmidt trigger is difference Schmidt trigger.
3. circuit single-ended signal being converted to differential signal according to claim 1, is characterized in that, the input stage of Schmidt trigger is CMOS tube or bipolar transistor.
4. circuit single-ended signal being converted to differential signal according to claim 3, it is characterized in that, when the input stage of Schmidt trigger is CMOS tube, AC coupled resistance between two inputs of Schmidt trigger is merged into the first resistance and is connected across between two inputs of Schmidt trigger, described direct-flow biasing circuit is connected directly between any one end of this first resistance, the electric capacity of high pass filter connects the output of trans-impedance amplifier, Schmidt trigger input connects the output of high pass filter, another input is by electric capacity of voltage regulation ground connection.
5. circuit single-ended signal being converted to differential signal according to claim 1, is characterized in that, increases first stage amplifier, for improving the working range of whole circuit in the front end of Schmidt trigger.
6. circuit single-ended signal being converted to differential signal according to claim 5, is characterized in that, the amplifier increased in the front end of Schmidt trigger is differential amplifier.
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| CN106505985A (en) * | 2015-09-03 | 2017-03-15 | 联发科技股份有限公司 | Single-ended to differential conversion circuit and signal processing module |
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| CN104422867B (en) * | 2013-09-03 | 2017-06-06 | 安凯(广州)微电子技术有限公司 | A kind of chip device and its method of testing |
| CN104720786B (en) * | 2013-12-23 | 2017-04-12 | 中国科学院深圳先进技术研究院 | Chip of active electrode for collecting human body surface biological electric signals |
| CN107294614A (en) * | 2017-07-27 | 2017-10-24 | 青岛海信宽带多媒体技术有限公司 | The signal output method of optical module and optical module |
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| CN102386857A (en) * | 2011-09-22 | 2012-03-21 | 佛山敏石芯片有限公司 | Limiting amplifier without direct current restorer |
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| CN101626232A (en) * | 2009-08-07 | 2010-01-13 | 天津泛海科技有限公司 | High speed phase splitting circuit |
| CN102386857A (en) * | 2011-09-22 | 2012-03-21 | 佛山敏石芯片有限公司 | Limiting amplifier without direct current restorer |
| CN202713264U (en) * | 2012-07-03 | 2013-01-30 | 佛山敏石芯片有限公司 | Circuit converting single-terminal signal into difference signal |
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| CN106505985A (en) * | 2015-09-03 | 2017-03-15 | 联发科技股份有限公司 | Single-ended to differential conversion circuit and signal processing module |
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