CN202713264U - Circuit converting single-terminal signal into difference signal - Google Patents
Circuit converting single-terminal signal into difference signal Download PDFInfo
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- CN202713264U CN202713264U CN 201220320036 CN201220320036U CN202713264U CN 202713264 U CN202713264 U CN 202713264U CN 201220320036 CN201220320036 CN 201220320036 CN 201220320036 U CN201220320036 U CN 201220320036U CN 202713264 U CN202713264 U CN 202713264U
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Abstract
The utility model discloses a circuit converting a single-terminal signal into a difference signal. The circuit converting the single-terminal signal into the difference signal comprises a transimpedance amplifier, a high pass filter, an alternating current coupling resistor, a direct current bias circuit, a voltage stabilization capacitor and a Schmitt trigger, wherein the transimpedance amplifier is connected with the high pass filter, the high pass filter is connected with an input end of the Schmitt trigger, the voltage stabilization capacitor is connected between the other input end of the Schmitt trigger and the ground wire, the alternating current coupling resistor is arranged between the two input ends of the Schmitt trigger, the direct current bias circuit which is connected between two output ends of the Schmitt trigger is used for providing direct work voltage for the two input ends of the Schmitt trigger to enable the direct work voltage of the two input ends to tend to be equal. The circuit converting the single-terminal signal into the difference signal is obviously advantaged in that the circuit is applicable to a continuous-mode transimpedance amplifier as well as a burst-mode transimpedance amplifier.
Description
Technical field
The utility model relates to electronic circuit field, in particular a kind of circuit that single-ended signal is converted to differential signal.
Background technology
Trans-impedance amplifier is the electronic circuit that current signal is changed into voltage signal and amplified.One of its modal purposes is the preamplifier that is used for photelectric receiver in the opto-electronic communications technology.The trans-impedance amplifier that is used for the communicate optical signal receiver has two kinds of mode of operations, i.e. continuous mode and burst mode.Under burst mode, signal stream is intermittent type, have pause between two segment signals of front and back, and the intensity of every segment signal can have larger difference.This is a new challenge for trans-impedance amplifier in the burst mode functional requirement.Simultaneously, along with the raising of optical communication network speed, the signal of telecommunication that is transformed through light signal generally all needs to adopt the form of difference.Output signal is that this requirement of difference form also is another challenge that the design of burst mode trans-impedance amplifier runs into.
Light signal transforms the signal of telecommunication that produces with the trans-impedance amplifier amplification through photodiode 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 is converted to differential signal normally utilizes a DC restoration circuit to finish.The effect of DC restoration circuit is to utilize negative feedback loop to produce one to equate or close DC reference voltage with the single-ended signal DC component.Simultaneously single-ended signal and DC reference voltage are connected to the input of differential amplifier, output signal has just become differential signal.Existing burst mode trans-impedance amplifier is exactly to increase (as shown in Figure 1) that a negative feedback loop time constant selector switch S realizes difference output translation function on the basis of above-mentioned DC restoration circuit structure.
Therefore, prior art has yet to be improved and developed.
The utility model content
The purpose of this utility model is to provide a kind of circuit that single-ended signal is converted to differential signal, being intended to solve the trans-impedance amplifier of existing continuous mode and burst mode can not use mutually, and the trans-impedance amplifier that is used for burst mode of operation need to increase on the basis of DC restoration circuit structure the problem that a negative feedback loop time constant selector switch be realized difference output translation function.
The technical solution of the utility model is as follows:
A kind of circuit that single-ended signal is converted to 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 input of Schmidt trigger; Be connected electric capacity of voltage regulation between another input of Schmidt trigger and the 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, is used to two inputs of Schmidt trigger that direct-current working volts are provided, and the direct-current working volts trend of two inputs of Schmidt trigger is equated.
The described circuit that single-ended signal is converted to differential signal, wherein, described Schmidt trigger is the difference Schmidt trigger.
The described circuit that single-ended signal is converted to differential signal, wherein, the input stage of Schmidt trigger is CMOS pipe or or bipolar transistor.
The described circuit that single-ended signal is converted to differential signal, wherein, when the input stage of Schmidt trigger is the CMOS pipe, AC coupled resistance between two inputs of Schmidt trigger is merged between two inputs that a resistance is connected across this schmitt trigger, described direct-flow biasing circuit directly is connected to any end of this resistance, the electric capacity of high pass filter connects the output of trans-impedance amplifier, input of this schmitt trigger connects the output of high pass filter, and another input is by electric capacity of voltage regulation ground connection.
The described circuit that single-ended signal is converted to differential signal wherein, at the front end increase one-level amplifier of Schmidt trigger, is used for improving the working range of whole circuit.
The described circuit that single-ended signal is converted to differential signal, wherein, the amplifier that increases at the front end of Schmidt trigger is differential amplifier.
The beneficial effects of the utility model: the utility model is by utilizing first the flip-flop in the 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 not only is applicable to the continuous mode trans-impedance amplifier but also be applicable to the burst mode trans-impedance amplifier.That is to say that the trans-impedance amplifier that utilizes this method design can continuously compatible and two kinds of application of burst.In burst mode was used, this trans-impedance amplifier need not external control signal of the prior art.
Description of drawings
Fig. 1 is the difference transferring structure of existing burst mode trans-impedance amplifier.
Fig. 2 is the theory diagram of the circuit that provides of the utility model.
Fig. 3 is the circuit theory diagrams of the preferred embodiment one that provides of the utility model.
Fig. 4 is the circuit theory diagrams of the preferred embodiment two that provides of the utility model.
Fig. 5 is the circuit theory diagrams after further improving on the basis of the utility model embodiment.
Fig. 6 is the signal waveforms of the processing of circuit that provides of the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, referring to the accompanying drawing embodiment that develops simultaneously the utility model is further described.
The difference conversion circuit that is used for the burst mode trans-impedance amplifier that the utility model provides 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 the difference Schmidt trigger, and the input stage of Schmidt trigger both can also can be bipolar transistor (BJT) for CMOS.Be connected electric capacity of voltage regulation between input of Schmidt trigger and the ground wire GND, for high-frequency signal, this node is equivalent to ground connection.Another input of Schmidt trigger links to each other with the output of high pass filter.The resistance that connects between two inputs of Schmidt trigger is AC coupled resistance.The output signal of high pass filter directly is added between two inputs of difference Schmidt trigger.Described direct-flow biasing circuit is connected on the AC coupled resistance, is used to two inputs of Schmidt trigger that direct-current working volts are provided.Direct-flow biasing circuit can have multiple implementation method, and prerequisite is to make the direct-current working volts of two inputs of Schmidt trigger approaching or equal.For the difference Schmidt trigger, input high-frequency signal is provided by high pass filter, and direct-current working volts are provided by bias circuit, so what substantive difference the coupling of its working method and fully differential does not have.The circuit that the utility model provides 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 the output high level state; Another is the output low level state.Its state is kept by the current potential of input signal, its trigger process, and the input mode that namely causes trigger to transform between two output states also has two kinds of variations: forward triggers (the current potential forward increases progressively rising edge) and triggers (negative sense successively decrease trailing edge) with negative sense.The input potential value (being activation threshold value voltage) of two kinds of trigger process generations is different, is called forward threshold voltage and negative sense threshold voltage.
Input signal rises to the input voltage that the process of high level circuit state is changed from low level and is called forward threshold voltage; Input signal drops to the input voltage that the low level process circuit state is changed from high level and is called the negative sense threshold voltage.Forward threshold voltage is generally greater than the negative sense threshold voltage, and the difference of forward threshold voltage and negative sense threshold voltage is called the voltage sluggishness.
Schmidt trigger also depends on the initial condition of its output to the response of the pulse of forward unit width, the pulse of negative sense unit width and three kinds of elements of middle bit level.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; Output is just overturn when running into the pulse of negative sense unit width, becomes low level state.Otherwise if initial condition is low level state, when running into the pulse of negative sense unit width, output is just constant or keep its original low level state, and output is just overturn when running into the pulse of forward unit width, becomes high level state.When input was in the meta level, Schmidt trigger just kept its existing state always.
Referring to Fig. 3, be the utility model preferred embodiment one, signal at first enters high-pass filtering capacitor C 2 through behind the trans-impedance amplifier, from an input of direct this schmitt trigger of input difference of the output of this high pass filter, between two inputs of this schmitt trigger, be connected with the first AC coupled resistance R 1 and the second AC coupled resistance R 2.Be connected with electric capacity of voltage regulation C1 between another input of this schmitt trigger and the ground wire.Between the first AC coupled resistance R 1 and the second AC coupled resistance R 2, be connected with direct-flow biasing circuit.The signal of input directly is carried between two inputs of this schmitt trigger, by the differential signal that is treated to of described this schmitt trigger.
When the input stage of Schmidt trigger is the CMOS pipe, the utility model also provides preferred embodiment two as shown in Figure 4, because the input stage of Schmidt trigger is the CMOS pipe, the first AC coupled resistance R 1 of series connection and the second AC coupled resistance R 2 are merged between two inputs that the first resistance R is connected across this schmitt trigger, described Dc bias can be added in any end of this resistance R, namely on any one input of this schmitt trigger.Input of this schmitt trigger 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 further be optimized.As shown in Figure 5, the front end at Schmidt trigger increases the one-level amplifier in order to improve the working range of whole circuit.This amplifier also is differential amplifier.
All circuit to sum up of the present utility modelly are summarized as a kind of method that single-ended signal is converted to differential signal, and its treatment step is: utilize first the flip-flop in the high pass filter erasure signal; The difference of recycling difference Schmidt trigger settling signal transforms.
Described high pass filter is equivalent to the step detector in time domain.Referring to Fig. 6, a rising edge appears when signal waveforms a is upper, and the direct impulse of a unit width will appear in the rear end of high pass filter; Otherwise, a trailing edge appears when signal waveforms a is upper, and the negative-going pulse of a unit width will appear in the rear end of AC coupled resistance; And in the time period that does not have step, i.e. the horizontal segment of signal waveform a will be constant at the meta Level hold in the back end signal of AC coupled resistance.So, just become by the direct impulse of unit width, negative-going pulse and three kinds of elements of middle bit level of unit width arteries and veins through the signal waveform after described high pass filter and the ac-coupled device and to consist of, shown in the b waveform among Fig. 6.
Schmidt trigger will produce after ac-coupled device and high pass filter, change into the waveform input signal that amplitude is amplified by the direct impulse of unit width, the negative-going pulse of unit width and the waveform that three kinds of elements of middle bit level consist of, shown in waveform c among Fig. 6.
The utility model proposes a kind of implementing circuit structure that single-ended signal is converted to differential signal, not only be applicable to the continuous mode trans-impedance amplifier but also be applicable to the burst mode trans-impedance amplifier.In burst mode was used, this trans-impedance amplifier need not external control signal of the prior art.
Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (6)
1. a circuit that single-ended signal is converted to differential signal is characterized in that, 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 input of Schmidt trigger; Be connected electric capacity of voltage regulation between another input of Schmidt trigger and the 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, is used to two inputs of Schmidt trigger that direct-current working volts are provided, and the direct-current working volts trend of two inputs of Schmidt trigger is equated.
2. the circuit that single-ended signal is converted to differential signal according to claim 1 is characterized in that, described Schmidt trigger is the difference Schmidt trigger.
3. the circuit that single-ended signal is converted to differential signal according to claim 1 is characterized in that, the input stage of Schmidt trigger is CMOS pipe or bipolar transistor.
4. the circuit that single-ended signal is converted to differential signal according to claim 3, it is characterized in that, when the input stage of Schmidt trigger is the CMOS pipe, AC coupled resistance between two inputs of Schmidt trigger is merged between two inputs that the first resistance is connected across this schmitt trigger, described direct-flow biasing circuit directly is connected to any end of this first resistance, the electric capacity of high pass filter connects the output of trans-impedance amplifier, input of this schmitt trigger connects the output of high pass filter, and another input is by electric capacity of voltage regulation ground connection.
5. the circuit that single-ended signal is converted to differential signal according to claim 1 is characterized in that, at the front end increase one-level amplifier of Schmidt trigger, is used for improving the working range of whole circuit.
6. the circuit that single-ended signal is converted to differential signal according to claim 5 is characterized in that, the amplifier that increases at the front end of Schmidt trigger is differential amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220320036 CN202713264U (en) | 2012-07-03 | 2012-07-03 | Circuit converting single-terminal signal into difference signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220320036 CN202713264U (en) | 2012-07-03 | 2012-07-03 | Circuit converting single-terminal signal into difference signal |
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| CN202713264U true CN202713264U (en) | 2013-01-30 |
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| CN 201220320036 Expired - Fee Related CN202713264U (en) | 2012-07-03 | 2012-07-03 | Circuit converting single-terminal signal into difference signal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723944A (en) * | 2012-07-03 | 2012-10-10 | 佛山敏石芯片有限公司 | Method and circuit for converting single-ended signal to differential signal |
| CN104422867A (en) * | 2013-09-03 | 2015-03-18 | 安凯(广州)微电子技术有限公司 | Chip device and testing method thereof |
| 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 |
| CN107666309A (en) * | 2017-11-27 | 2018-02-06 | 中山路得斯空调有限公司 | A kind of modified single-ended transfer difference signal circuit |
-
2012
- 2012-07-03 CN CN 201220320036 patent/CN202713264U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723944A (en) * | 2012-07-03 | 2012-10-10 | 佛山敏石芯片有限公司 | Method and circuit for converting single-ended signal to differential signal |
| CN102723944B (en) * | 2012-07-03 | 2016-01-20 | 佛山敏石芯片有限公司 | A kind of method and circuit single-ended signal being converted to differential signal |
| CN104422867A (en) * | 2013-09-03 | 2015-03-18 | 安凯(广州)微电子技术有限公司 | Chip device and testing method thereof |
| 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 |
| 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 |
| CN107666309A (en) * | 2017-11-27 | 2018-02-06 | 中山路得斯空调有限公司 | A kind of modified single-ended transfer difference signal circuit |
| CN107666309B (en) * | 2017-11-27 | 2023-07-25 | 广东路得斯环境科技有限公司 | Improved single-ended differential signal circuit |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20160703 |