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Analog front-end circuit for fully-differential optical receiver based on adjustable common-emitter common-base structure

An analog front-end circuit and cascode technology, applied in the direction of electromagnetic receivers, can solve the problems of reducing gain, increasing chip area and noise, increasing design costs, etc., to achieve expanded bandwidth, improved single-stage gain, and good noise performance Effect

Inactive Publication Date: 2016-10-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, passive inductance peaking technology, parallel double feedback and advanced technology are used to optimize the performance of the optical receiver circuit, but this will increase the chip area and noise, reduce the gain, and increase the design cost

Method used

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  • Analog front-end circuit for fully-differential optical receiver based on adjustable common-emitter common-base structure
  • Analog front-end circuit for fully-differential optical receiver based on adjustable common-emitter common-base structure
  • Analog front-end circuit for fully-differential optical receiver based on adjustable common-emitter common-base structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The embodiment of the present invention is based on the standard SiGe BiCMOS process, and proposes a fully differential optical receiver analog front-end circuit. The specific circuit includes:

[0032] Two photodetectors with completely symmetrical structures are used to convert the weak optical signal input by the optical fiber into a set of electrical pulse signals with opposite phases;

[0033] A transimpedance amplifier (TIA) with a one-stage differential structure is used to convert the weak current signal of the photodetector into a voltage signal and amplify it. The output terminal is connected with a first-stage emitter follower, which is used to increase the output load and reduce the DC level.

[0034] A common-emitter amplifier (CE) is used to improve the reverse isolation of the circuit and compensate the low-frequency pole of the circuit through capacitive degeneration technology. An emitter follower is cascaded at the output end to reduce the output DC l...

Embodiment 2

[0044] Combine below figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 The high-speed, high-gain optical receiver front-end analog circuit in Embodiment 1 is introduced in detail, see the following description for details:

[0045] figure 2 A preferred embodiment of differential structure regulated cascode (RGC) transimpedance amplifier is given. The circuit mainly includes: an RGC amplifier and an RC network that replaces the traditional tail current source, and its function is to amplify the weak signal current output by the photodetector and convert it into a voltage signal.

[0046] In addition to the RC network in the transimpedance amplifier (resistor R C with capacitance C C ), the circuit is completely symmetrical and identical. Detector Junction Capacitance C pd One end and input end, resistance R 13 , Transistor T 11The emitter and T 12 The base is connected, the other end is grounded; the resistor R 13 The other end of the ground; transistor T...

Embodiment 3

[0075] Combine below Figure 7 The feasibility verification of the high-speed, high-gain optical receiver analog front-end circuit in Embodiments 1 and 2 is described in detail below:

[0076] Figure 7 It is the amplitude-frequency curve response of the front-end analog circuit of a high-speed, high-gain optical receiver. The experimental process is well known to those skilled in the art, and will not be described in detail in this embodiment of the present invention.

[0077] The simulation results show that the total transimpedance gain of the circuit is 113dBΩ, and the -3dB bandwidth is 17.2GHz, which verifies the feasibility of the analog circuit and meets various needs in practical applications.

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Abstract

The invention discloses an analog front-end circuit for a fully-differential optical receiver based on an adjustable common-emitter common-base structure. The analog front-end circuit comprises two photoelectric detectors, a set of cascade differential amplitude-limiting amplifiers and an output buffer stage, wherein the structures of the two photoelectric detectors are completely symmetrical; the analog front-end circuit further comprises a differential structure adjustable common-emitter common-base trans-impedance amplifier and a first-stage common-emitter amplifier; the trans-impedance amplifier comprises a common-emitter common-base structural amplifier; a resistor and capacitor parallel manner is adopted in a tail current source; the first-stage common-emitter amplifier comprises a common-emitter amplifier and a degenerate resistor and capacitor for improving the reverse isolation degree of the circuit; furthermore, a low-frequency pole is compensated through a capacitive degeneration technology; the differential amplitude-limiting amplifiers are used for changing resistance feedback in a Cherry-Hooper structure into active feedback; furthermore, an output load resistor is additionally arranged; the output buffer stage is used for converting output impedance into 50-omega standard impedance; and thus, the driving capability is improved. The analog front-end circuit for the optical receiver having excellent performance is researched in the invention.

Description

technical field [0001] The invention relates to the field of fully differential optical receivers, in particular to an improved high-gain, high-speed adjustable cascode (RGC) structure fully differential optical receiver analog front-end circuit. Background technique [0002] With the rise of big data carriers such as the Internet of Things, cloud computing, and mobile Internet, the amount of information transmission has increased in an avalanche, which makes the information communication between circuit boards, between chips, and inside chips put forward higher requirements for bandwidth, and also imposes higher requirements on data centers. The network architecture poses a challenge. However, traditional copper interconnects are limited by "electronic bottlenecks" that are difficult to adapt to ultra-high-speed data transmission and exchange. In contrast, optical interconnection uses photons as the information carrier, which has the advantages of low loss, fast speed and ...

Claims

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Application Information

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IPC IPC(8): H04B10/60
CPCH04B10/60
Inventor 谢生吴思聪毛陆虹高谦
Owner TIANJIN UNIV
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