Trans-impedance amplifier with switchable transimpedance gain and single-ended to differential amplification circuit

Abstract

The invention discloses a transimpedance amplifier with switchable transimpedance gain and a single-ended to differential amplification circuit, the transimpedance amplifier with switchable transimpedance gain comprises a single-ended amplifier, a main feedback resistor, a high-speed signal strength detection circuit and at least one high-speed gain switching circuit, the single-ended amplifier is connected in parallel with the main feedback resistor; wherein the high-speed signal strength detection circuit detects the output signal strength of the single-ended amplifier; the input end and the output end of each high-speed gain switching circuit are respectively connected with the input end and the output end of the single-ended amplifier, and the control end of each high-speed gain switching circuit is connected with the output end of the high-speed signal strength detection circuit; the single-ended to differential amplification circuit comprises the transimpedance amplifier with the switchable transimpedance gain. The transimpedance amplifier with the switchable transimpedance gain and the single-ended to differential amplification circuit are suitable for a burst receiving system.

Description

technical field [0001] The invention relates to the field of transimpedance amplifiers, in particular to a transimpedance gain switchable transimpedance amplifier and a single-end-to-differential amplifier circuit. Background technique [0002] In modern high-speed optical fiber communication systems, the transimpedance amplifier TIA (Trans-Impedance Amplifier) ​​is used to convert and amplify the weak photocurrent signal generated by the photodiode into a voltage signal, and then output it to the back-end circuit for processing. Therefore, the transimpedance amplifier TIA is at the forefront of the receiving end and is the core device of the receiving end of the optical communication system. Its core indicators such as noise, sensitivity, dynamic range, and sensitivity basically determine the performance of the entire receiving system. [0003] The input dynamic range of a transimpedance amplifier circuit is an important indicator, which is defined as the difference between...

AI Technical Summary

Problems solved by technology

In high-speed signal transmission, in order to suppress common-mode noise, it is necessary to further convert the single-ended voltage signal into a differential voltage signal to facilitate the elimination of common-mode noise; two commonly used single-ended to differential amplifier circuits are as follows: Figure 7 and Figure 8 As shown, but in order to maintain the stability of the bias end, these two existing single-ended to differential amplifier circuits need to perform low-pass filtering, which requires a long time for convergence to stabilize, and cannot be applied to burst receiving systems.

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