CN101626232A - High speed phase splitting circuit - Google Patents
High speed phase splitting circuit Download PDFInfo
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- CN101626232A CN101626232A CN200910070092A CN200910070092A CN101626232A CN 101626232 A CN101626232 A CN 101626232A CN 200910070092 A CN200910070092 A CN 200910070092A CN 200910070092 A CN200910070092 A CN 200910070092A CN 101626232 A CN101626232 A CN 101626232A
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Abstract
The invention is a high speed phase splitting circuit. In the circuit, a source follower is connected with a phase splitting amplifier which is connected with a lossy integrator; the source follower is used for carrying out level shift on the signal output by a transimpedance amplifier; the phase splitting amplifier is used for transforming the input single-ended signal into double-ended differential signal and amplifying the double-ended differential signal in a higher speed; two input ends of the lossy integrator are respectively connected with output ends of the phase splitting amplifier, and the common mode voltage difference of the phase splitting amplifier controls the output of the integrator; the output voltage of the integrator is connected on the reverse input end of the phase splitting amplifier, and the common mode voltage thereof changes with the common mode voltage of the input signal.
Description
Technical field
The invention belongs to the integrated circuit (IC) design field in optical communication field, particularly a kind of high speed phase splitting circuit.
Background technology
Optical fiber communication is to be information carrier with light, optical fiber is as a kind of communication mode of transmission medium, optical fiber communication relates to fields such as optical-fiber network, photoelectric device and microelectronic circuit, and wherein microelectronic circuit is the interface that connects optical-fiber network and user terminal, is the bottleneck of present optical communication industry development.The microelectronic integrated circuit that is applied to optical communication network mainly comprises preposition trans-impedance amplifier, limiting amplifier, clock and data recovery circuit, coupler and multiplexer etc.Wherein preposition trans-impedance amplifier directly links to each other with photoelectric detector, and photoelectric detector is transformed into electric current with the light signal of input, and amplification obtains the correspondent voltage signal to this current signal through preamplifier.Generally speaking, this preposition trans-impedance amplifier is single-ended, need single-ended signal be transformed into differential signal through a phase place splitting amplifier, handles for the back level.Handle and minimal distortion for the ease of late-class circuit, need this differential signal that identical common-mode voltage is arranged, and have the phase difference of 180 degree.
At present regular meeting adopts phase place division circuit in the optical communication trans-impedance amplifier, generally be by with input signal through a low pass filter obtaining its common-mode voltage, and this common-mode voltage is transferred to the end of oppisite phase of phase place splitting amplifier.The electric capacity of this low pass filter is all very big, to obtain lower cut-off frequency, realizes the signal of input is got the purpose of common mode.But this needs more chip area, and the response time of this low pass filter all can be longer.Like this, the situation that the two ends common-mode voltage of phase place splitting amplifier can accurately not equate occurs through regular meeting, the common-mode voltage of its output can not wait yet, and common-mode voltage imbalance or two paths of differential signals phase place occur and skew occurs.
Summary of the invention
Technical problem to be solved by this invention is: a kind of optical fiber telecommunications system high speed phase splitting circuit that is used for is provided.Its response time is short, and two input common-mode voltages of phase place splitting amplifier equate that accurately the common-mode voltage of output accurately equates, common-mode voltage phase place non-migration.
Technical scheme of the present invention is:
A kind of high speed phase splitting circuit is characterized in that: connect a phase place splitting amplifier by a source follower, the phase place splitting amplifier connects one and diminishes integrator; Its source follower, the signal that trans-impedance amplifier is exported carries out level shift; Its phase place splitting amplifier converts the single-ended signal of importing to the both-end differential signal, and amplifies with higher speed; It diminishes integrator, and two inputs are connected on respectively on the output of phase place splitting amplifier, and its common mode voltage difference the output of integrator; Integrator output voltage is connected on the reverse input end of phase place splitting amplifier, and its common-mode voltage can change along with the input signal common-mode voltage.
The described integrator that diminishes comprises that resistance and integrating capacitor are in parallel, and this resistance is the connection in series-parallel of linear resistance or a plurality of linear resistances.
The described integrator that diminishes comprises that resistance and integrating capacitor are in parallel the resistance that this resistance is made up of the transistor that is operated in linear zone.
Described two inputs that this diminishes integrator are respectively two outputs of phase place splitting amplifier, and its output is the inverting input of phase place splitting amplifier.
Described this diminishes between the in-phase input end of integrator and the bias voltage and exists a compensating resistance, and with the difference between current of compensation homophase with end of oppisite phase, this resistance is the connection in series-parallel of employing linear resistance or a plurality of linear resistances.
Described this diminishes between the in-phase input end of integrator and the bias voltage and exists a compensating resistance, and with the difference between current of compensation homophase and end of oppisite phase, this resistance can be the MOS transistor that is operated in linear zone.
Effect of the present invention is:
This phase place division circuit common mode input is to be determined through an integrator that diminishes by its output common mode voltage.This diminishes integrator and realizes that by big resistance in parallel on integrating capacitor the gain of this integrator determines to have higher low-frequency gain by resistance ratio under low frequency, and the common-mode voltage that equates with input signal is provided for the phase place splitting amplifier.For the homophase that remedies this integrator and the difference between current of inverting amplifier, between the in-phase end of integrator and bias voltage, also introduced a resistance, guarantee that two outputs of phase place division circuit accurately equate.
The common-mode voltage that its effect is mainly reflected in two outputs of phase place splitting amplifier accurately equates.When the common mode electrical level of this phase place splitting amplifier in-phase end input signal changed, the common-mode voltage that its end of oppisite phase obtains can be followed the tracks of the variation of in-phase end common-mode voltage rapidly, and it is accurately equal to adjust the maintenance of two output common-mode voltages.Table 1 has provided when bigger variation takes place the in-phase end voltage of phase place splitting amplifier, and the end of oppisite phase common-mode voltage that emulation obtains is followed situation.Simulation result shows, when the common mode input of phase place splitting amplifier when 0.5V changes to 2V, the error of its end of oppisite phase common-mode voltage and common mode input is below 1mV.When common mode input reached 2.2V, it followed deleterious, and both errors have reached 3.3mV.
Table 1 phase place splitting amplifier homophase and end of oppisite phase common-mode voltage are followed the situation simulation result
| In-phase end common mode input/mV | ??500 | ??840 | ??1180 | ??1520 | ??1860 | ??2000 | ??2200 |
| End of oppisite phase common-mode voltage/mV | ??500.014 | ??840.006 | ??1180 | ??1520 | ??1860 | ??1999.93 | ??2196.7 |
Description of drawings
Fig. 1 is an optical communication trans-impedance amplifier functional block diagram
Fig. 2 is a kind of structural representation of high speed phase splitting circuit
Fig. 3 is the structural representation of another kind of high speed phase splitting circuit
Embodiment
The present invention can be achieved through the following technical solutions.After the voltage signal of trans-impedance amplifier output carries out level shift through source follower, be input to the in-phase input end of phase place splitting amplifier.The two-way output signal of phase place splitting amplifier should output to back level buffer circuit, also outputs to the input that diminishes integrator simultaneously.This diminishes integrator the voltage difference of homophase and inverting input is amplified, and according to amplifying the common-mode voltage of control phase splitting amplifier inverting input as a result.Under the low frequency, the gain that diminishes integrator is determined by resistance ratio, to determine the common mode value of phase place splitting amplifier end of oppisite phase input voltage.Under the high frequency, integrating capacitor will be imported and output short-circuit, so integrator can not exert an influence to the output of phase place splitting amplifier.Simultaneously, between the in-phase input end of integrator and bias voltage, introduced and a current compensation resistance, with the influence of the homophase that remedies integrator and inverting input difference between current phase place splitting amplifier output common mode voltage.
This high speed phase splitting circuit mainly comprises following circuit:
A source follower, the signal that trans-impedance amplifier is exported carries out level shift.
A phase place splitting amplifier converts the single-ended signal of importing to the both-end differential signal, and amplifies with higher speed.
One diminishes integrator, and two inputs are connected on respectively on the output of phase place splitting amplifier, and its common mode voltage difference the output of integrator.Integrator output voltage is connected on the reverse input end of phase place splitting amplifier, and its common-mode voltage can change along with the input signal common-mode voltage.
The described integrator that diminishes comprises that resistance and integrating capacitor are in parallel, and this resistance can be the resistance that linear resistance also can be made up of the transistor that is operated in linear zone, can also be the connection in series-parallel of above-mentioned a plurality of resistance.
Described two inputs that this diminishes integrator are respectively two outputs of phase place splitting amplifier, and its output is the inverting input of phase place splitting amplifier.
Described this diminishes between the in-phase input end of integrator and the bias voltage and exists a compensating resistance, difference between current with compensation homophase and end of oppisite phase, this resistance can be the MOS transistor design of adopting linear resistance or being operated in linear zone, also can be the connection in series-parallel of a plurality of above-mentioned resistance.
Below in conjunction with accompanying drawing the specific embodiment of the invention is further described.
Fig. 1 is the applied environment of phase place division circuit of the present invention, and light signal converts the light signal of importing to current signal through photodiode behind spread fiber, and this current signal amplifies through trans-impedance amplifier and also changes single-ended voltage signal into.Single-ended voltage signal becomes the differential signal with 180 degree phase differences after handling through the phase place splitting amplifier, and this differential signal improves its driving force through the output buffer buffering to reduce resistance.
Fig. 2 is the phase place division circuit that the present invention designs, and the output signal VO_TIA of trans-impedance amplifier after the level shift circuit displacement of being made up of transistor M1 and resistance R 1, R2, passes to the in-phase end of phase place splitting amplifier A1.The end of oppisite phase of this phase place splitting amplifier needs a bias voltage that has identical common mode value with in-phase end, and this bias voltage provides by diminishing integrator.Diminish integrator and mainly comprise operational amplifier A 2, resistance R 3-R5 and integrating capacitor C1, its input signal is the output signal VON_phase splitter and the VOP_phase splitter of phase place splitting amplifier, and output is connected the inverting input of phase place splitting amplifier.Under low frequency, this gain that diminishes integrator is determined by resistance ratio R5/R3.In when design, because R5 is much larger than R3, so this gain that diminishes integrator is very big.Can adjust the common-mode voltage of phase place splitting amplifier end of oppisite phase signal according to the difference of its input signal, accurately equate up to phase place splitting amplifier homophase and end of oppisite phase input common-mode.Under high frequency, the gain that diminishes integrator is 1/jwC1R3, and its gain is very little, and therefore the output to the phase place splitting amplifier can not exert an influence.In the course of the work, because there is voltage difference in the input and output side of integrator, therefore there is electric current to flow through from R5, the homophase of integrator and inverting input electric current are unequal like this, thereby cause input voltage unequal, this can cause phase place splitting amplifier two inputs to have offset voltage.Therefore, between the end of oppisite phase of integrator and bias voltage VB, introduced resistance R 6 here, to remedy its electric current imbalance.
Fig. 3 is the another kind of embodiment of the phase place division circuit that designs of the present invention, and its resistance is to adopt the MOS transistor design that is operated in linear district, and its resistance can be expressed as
Here transistor M2-M5 is designed to length much larger than width, realizes bigger resistance with less chip area, and wherein the resistance of each resistance all can reach more than the M Ω.
Claims (6)
1, a kind of high speed phase splitting circuit is characterized in that: connect a phase place splitting amplifier by a source follower, the phase place splitting amplifier connects one and diminishes integrator; Its source follower, the signal that trans-impedance amplifier is exported carries out level shift; Its phase place splitting amplifier converts the single-ended signal of importing to the both-end differential signal, and amplifies with higher speed; It diminishes integrator, and two inputs are connected on respectively on the output of phase place splitting amplifier, and its common mode voltage difference the output of integrator; Integrator output voltage is connected on the reverse input end of phase place splitting amplifier, and its common-mode voltage can change along with the input signal common-mode voltage.
2, high speed phase splitting circuit according to claim 1 is characterized in that: the described integrator that diminishes comprises that resistance and integrating capacitor are in parallel, and this resistance is the connection in series-parallel of linear resistance or a plurality of linear resistances.
3, high speed phase splitting circuit according to claim 1 is characterized in that: the described integrator that diminishes comprises that resistance and integrating capacitor are in parallel the resistance that this resistance is made up of the transistor that is operated in linear zone.
4, high speed phase splitting circuit according to claim 1 is characterized in that: described two inputs that this diminishes integrator are respectively two outputs of phase place splitting amplifier, and its output is the inverting input of phase place splitting amplifier.
5, high speed phase splitting circuit according to claim 1, it is characterized in that: described this diminishes between the in-phase input end of integrator and the bias voltage and exists a compensating resistance, with the difference between current of compensation homophase and end of oppisite phase, this resistance is the connection in series-parallel of adopting linear resistance or a plurality of linear resistances.
6, high speed phase splitting circuit according to claim 1, it is characterized in that: described this diminishes between the in-phase input end of integrator and the bias voltage and exists a compensating resistance, with the difference between current of compensation homophase and end of oppisite phase, this resistance can be the MOS transistor that is operated in linear zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910070092XA CN101626232B (en) | 2009-08-07 | 2009-08-07 | High speed phase splitting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910070092XA CN101626232B (en) | 2009-08-07 | 2009-08-07 | High speed phase splitting circuit |
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| CN101626232A true CN101626232A (en) | 2010-01-13 |
| CN101626232B CN101626232B (en) | 2011-04-27 |
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| CN200910070092XA Expired - Fee Related CN101626232B (en) | 2009-08-07 | 2009-08-07 | High speed phase splitting circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340295A (en) * | 2011-05-30 | 2012-02-01 | 东南大学 | Broadband active balun circuit |
| CN102723916A (en) * | 2012-06-26 | 2012-10-10 | 福建一丁芯光通信科技有限公司 | High-speed phase splitting circuit with band spreading function |
| 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 |
| CN104333336A (en) * | 2014-09-25 | 2015-02-04 | 厦门优迅高速芯片有限公司 | Phase-splitting circuit applied to transimpedance amplification circuit |
| CN108322265A (en) * | 2014-10-15 | 2018-07-24 | 株式会社藤仓 | The control method of optical receiver, active optical cable and optical receiver |
| CN109040625A (en) * | 2017-06-09 | 2018-12-18 | 三星电子株式会社 | Signal transfer circuit, imaging sensor and method of communicating signals including it |
| WO2023108793A1 (en) * | 2021-12-17 | 2023-06-22 | 厦门亿芯源半导体科技有限公司 | High-speed trans-impedance amplifier having bandwidth extension characteristic within full-temperature range, and bandwidth extension method |
-
2009
- 2009-08-07 CN CN200910070092XA patent/CN101626232B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102340295A (en) * | 2011-05-30 | 2012-02-01 | 东南大学 | Broadband active balun circuit |
| CN102340295B (en) * | 2011-05-30 | 2014-02-26 | 东南大学 | Broadband active balun circuit |
| CN102723916A (en) * | 2012-06-26 | 2012-10-10 | 福建一丁芯光通信科技有限公司 | High-speed phase splitting circuit with band spreading function |
| 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 |
| CN104333336A (en) * | 2014-09-25 | 2015-02-04 | 厦门优迅高速芯片有限公司 | Phase-splitting circuit applied to transimpedance amplification circuit |
| CN104333336B (en) * | 2014-09-25 | 2017-05-24 | 厦门优迅高速芯片有限公司 | Phase-splitting circuit applied to transimpedance amplification circuit |
| CN108322265A (en) * | 2014-10-15 | 2018-07-24 | 株式会社藤仓 | The control method of optical receiver, active optical cable and optical receiver |
| CN109040625A (en) * | 2017-06-09 | 2018-12-18 | 三星电子株式会社 | Signal transfer circuit, imaging sensor and method of communicating signals including it |
| CN109040625B (en) * | 2017-06-09 | 2022-05-31 | 三星电子株式会社 | Signal transmission circuit, image sensor including the same, and signal transmission method |
| WO2023108793A1 (en) * | 2021-12-17 | 2023-06-22 | 厦门亿芯源半导体科技有限公司 | High-speed trans-impedance amplifier having bandwidth extension characteristic within full-temperature range, and bandwidth extension method |
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| Publication number | Publication date |
|---|---|
| CN101626232B (en) | 2011-04-27 |
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