Quick response automatic gain control method for trans-impedance amplifier

A technology of automatic gain control and transimpedance amplifier, applied in the direction of amplification control, gain control, electrical components, etc., can solve the problems of large TIA dynamic range, difficult adjustment, small transimpedance gain, etc., and achieve large transimpedance gain adjustment range, design flexibility, and the effect of widening the dynamic range

Pending Publication Date: 2021-09-28
HENGXIN SEMITECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, due to factors such as temperature changes and process deviations, it is very difficult to accurately set this bias voltage
On the other hand, in the whole dynamic range, if the overdrive voltage of NMOS does not exceed 0.2V, it is difficult to adjust to a small enough transimpedance gain under high input power, so it is difficult to achieve a large dynamic range of TIA

Method used

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  • Quick response automatic gain control method for trans-impedance amplifier
  • Quick response automatic gain control method for trans-impedance amplifier
  • Quick response automatic gain control method for trans-impedance amplifier

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0032] Such as image 3 As shown, the fast response automatic gain control method for the transimpedance amplifier in the preferred embodiment of the present invention comprises the following steps:

[0033] A. Detect the output amplitude of the transimpedance amplifier;

[0034] B. Compare the output amplitude with the reference signal representing the amplitude threshold; if the output amplitude is less than the threshold, disconnect the parallel connection between the active resistor and the passive resistor, so that the transimpedance gain of the transimpedance amplifier is equal to the resistance of the passive resistor ; If the output amplitude is greater than the threshold...

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Abstract

The invention discloses a quick response automatic gain control method for a trans-impedance amplifier. The method comprises the following steps: A, detecting the output amplitude of the trans-impedance amplifier; B, comparing the output amplitude with a reference signal representing an amplitude threshold; if the output amplitude is smaller than a threshold value, disconnecting the parallel connection of an active resistor and a passive resistor, and enabling the trans-impedance gain of the trans-impedance amplifier to be equal to the resistance value of the passive resistor; if the output amplitude is larger than the threshold value, connecting the active resistor and the passive resistor in parallel, so that the trans-impedance gain of the trans-impedance amplifier is equal to the parallel resistance value of the passive resistor and the active resistor, wherein the active resistor is an NMOS transistor, and when the active resistor is connected with the passive resistor in parallel, the grid voltage of the active resistor is direct-current bias voltage. The automatic gain control method provided by the invention can quickly respond to establish a steady state when the input optical power changes, can be used for a burst mode, and can provide a larger trans-impedance gain adjustment range, thereby widening the dynamic range of the trans-impedance amplifier.

Description

technical field [0001] The invention relates to the technical field of transimpedance amplifiers, in particular to a fast-response automatic gain control method for transimpedance amplifiers. Background technique [0002] In the optical fiber communication system, the transimpedance amplifier (TIA, Trans-Impedance Amplifier) ​​is at the front end of the receiving chain. Its function is to convert and amplify the weak photocurrent signal generated by the photodiode into a voltage signal, and output it to the subsequent circuit for further processing. deal with. The performance of TIA greatly affects the performance of the entire receiving chain. [0003] Input dynamic range is an important indicator of TIA, which is defined as the ratio of saturated input optical power to received optical sensitivity, that is, the ratio of the maximum and minimum input optical power within a certain allowable bit error rate range. The sensitivity is mainly determined by the noise performanc...

Claims

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Application Information

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IPC IPC(8): H03G3/30
CPCH03G3/3084
Inventor 杨家琪黄兆庭周俊
Owner HENGXIN SEMITECH CO LTD
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