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

A transimpedance amplifier, high dynamic range technology, used in light-controlled amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers with field effect devices, etc., can solve the problem of limited gain adjustment range, etc. The effect of dynamic range

Active Publication Date: 2019-07-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Embodiment Construction

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0028] The present invention provides a high dynamic range transimpedance amplifier. By introducing an additional bypass current branch structure controlled by an automatic gain control circuit, a large dynamic range support is provided while the amplifier is stable. At the same time, the dynamic range enhancement structure does not introduce large noise, and has almost no effect on sensitivity.

[0029] Figure 5 Shows a structural block diagram of a high dynamic range transimpedance amplifier proposed by the present invention. The transimpedance amplifier includes: an operational amplifier an...

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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...

Claims

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Application Information

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IPC IPC(8): H03F1/42H03F3/16H03F3/10H03F3/08
CPCH03F1/42H03F3/082H03F3/10H03F3/16
Inventor 毕晓君
Owner HUAZHONG UNIV OF SCI & TECH
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