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High-sensitivity ultra wide band super trans-impedance amplifier

A technology of transimpedance amplifiers and amplifiers, used in amplifiers, amplifier combinations, improving amplifiers to expand bandwidth, etc., can solve problems such as insufficiency, sensitivity or signal bandwidth damage, and achieve high bandwidth, low DC bias voltage, high The effect of sensitivity

Active Publication Date: 2019-08-30
南京牛芯微电子有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The bias voltage of the input tube N1 of the above-mentioned transimpedance amplifier is provided by the output of the following source follower, and generally in order to obtain a large enough gain and relatively small noise, the N1 tube needs a high DC bias voltage, which cannot It meets the requirement of input voltage of about 0.5V when commonly used PIN devices, but in order to meet the requirement of 0.5V input voltage, it often has to sacrifice noise performance, resulting in loss of sensitivity or signal bandwidth

Method used

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  • High-sensitivity ultra wide band super trans-impedance amplifier
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  • High-sensitivity ultra wide band super trans-impedance amplifier

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Embodiment Construction

[0021] see Figure 4 , the transimpedance amplifier of the present invention is composed of a high-gain amplifier, a bias circuit and a feedback resistor. where high-gain amplifiers refer to Figure 5 , consists of several cascaded amplifiers. The first-stage common-source amplifier is composed of N0 and R0. The gate of N0 is the input terminal of the PIN current signal, and its output is respectively sent to the first-stage improved common-gate amplifier and the first-stage cascode common-source common-gate amplifier. The respective descriptions are as follows : Modified Common Gate Amplifier See Figure 5 , consisting of N1 and R1; cascode cascode cascode see Figure 5 , composed of N2, N3, R2, R4. The gate of the traditional common gate amplifier is only connected to the DC level. The connection method of the present invention makes the N1 gate connected to the N3 signal amplified output, so that the output of N1 has higher gain and bandwidth, so it is called an improve...

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Abstract

The invention discloses a trans-impedance amplifier circuit which comprises a trans-impedance amplifier circuit composed of a first-stage common-source amplifier, a first-stage improved common-gate amplifier, a first-stage cascode common-source common-gate amplifier and a first-stage improved NMOS source follower. The trans-impedance amplifier has the advantages of being high in sensitivity, low in noise, low in direct current bias and ultra wide in band.

Description

technical field [0001] The invention relates to a transimpedance amplifier in an optical communication system. Background technique [0002] Optical fiber communications has become one of the main pillars of modern communications and plays a pivotal role in modern telecommunication networks. Its rapid development and wide range of applications in recent years are rare in the history of communication. It is also an important symbol of the world's new technological revolution and the main transmission tool for various information in the future information society. [0003] In the current optical communication receiving system, the PIN is becoming a common device widely used in photoelectric conversion, and the transimpedance amplifier (TIA) amplifies the signal current generated by the PIN and becomes a voltage signal that can be processed by subsequent circuits. Since TIA and PIN are often packaged together, it becomes an independent key circuit in the optical communication ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F1/26H03F1/48H03F3/68
CPCH03F1/301H03F1/26H03F1/483H03F3/68Y02D30/70
Inventor 黄颋李彧
Owner 南京牛芯微电子有限公司
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