High-dynamic-range trans-impedance amplifier with three controlled current branches

Abstract

The invention discloses a high-dynamic-range trans-impedance amplifier with three controlled current branches. The high-dynamic-range trans-impedance amplifier comprises an operational amplifier and the three controlled current branches. Wherein the first controllable current branch is arranged between the input end of the operational amplifier and an external input power supply, the second controllable current branch is arranged in the operational amplifier, and the third controllable current branch is arranged between the output end and the input end of the operational amplifier; the dynamicrange of the trans-impedance amplifier is widened through the combined action of the three controllable current branches, and a direct-current working point is stabilized. Due to the fact that an extra current branch is introduced outside the feedback loop, gain adjustment almost has no influence on zero-pole stability, and the dynamic range is enlarged. Meanwhile, the three controlled current branches are dynamically adjusted along with the input current intensity, and it is guaranteed that stable working points exist in the whole dynamic range.

Description

Technical field [0001] The invention belongs to the technical field of transimpedance amplifiers, and more specifically, relates to a transimpedance amplifier with a high dynamic range. Background technique [0002] Optical fiber communication plays a vital role in high-speed information transmission network. As an important part of the optical receiver, the transimpedance amplifier determines important indicators such as the sensitivity and input dynamic range of the receiver. In recent years, the increasing demand for high-capacity short-distance communications has made Passive Optoelectronic Networks (PON) an ideal solution for high speed and low cost. In a PON network, in order to meet the requirements of different transmission distances, the transimpedance amplifier needs to have high dynamic range and high sensitivity at the same time. [0003] figure 1 It is a block diagram of the front-end system of a conventional variable gain optoelectronic receiver, which includes: tra...

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Problems solved by technology

[0008] Aiming at the defects of the prior art, the purpose of the present invention is to provide a transimpedance amplifier with a high dynamic range, aiming to solve the problem of limited gain adjustment range in the prior art due to the constraints of zero-pole stability and DC operating point stability. The problem

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