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Inductor-free limiting amplifier circuit

A limiting amplifier, non-inductor technology, applied in the direction of amplifier combination, limiting amplitude, amplification control, etc., can solve the problems of output signal pulse width distortion, affecting the normal amplification of differential signals, affecting the static operating point of differential amplifiers, etc., to achieve reduction Effects of low frequency gain and attenuation of DC offset voltage

Inactive Publication Date: 2021-10-15
ZHENJIANG COLLEGE
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Excessive DC offset voltage will affect the quiescent operating point of the differential amplifier, thereby affecting the normal amplification of the differential signal, resulting in distortion of the output signal pulse width

Method used

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  • Inductor-free limiting amplifier circuit

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0016] An inductorless limiting amplifier circuit such as figure 1 As shown, including the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the first capacitor C1, the second capacitor C2, the first transistor M1, the second transistor M2, the first Three-transistor M3, fourth transistor M4, two-stage operational amplifier A F1 , limiting am...

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Abstract

The invention discloses an inductor-free limiting amplifier circuit, and relates to the technical field of inductor-free limiting amplifier circuits. The circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a secondary operational amplifier AF1, a limiting amplifier, an output buffer, a voltage Vin end, a voltage VDD end and a voltage Vout end. According to the invention, a four-stage three-order cascade structure is adopted, the bandwidth is expanded by using improved interleaved active negative feedback, the low-frequency gain of the circuit is reduced by using a low-pass negative feedback loop, and the direct-current offset voltage of the circuit can be effectively attenuated on the premise of not influencing the amplification of a high-frequency signal.

Description

technical field [0001] The invention relates to a non-inductor limiting amplifier circuit, which belongs to the technical field of amplifier circuits. Background technique [0002] In recent years, with the development of the Internet of Things and cloud computing, the bandwidth of data centers has increased rapidly. In order to carry huge data traffic, the role of optical links in data centers is becoming more and more extensive. As an important part of the optical receiver in the optical link, the limiting amplifier receives the small swing voltage signal of the transimpedance amplifier, amplifies it and transmits it to the clock recovery circuit to ensure that the clock recovery circuit can work normally. At the same time, in order to ensure the signal transmission quality and reduce the intersymbol interference introduced by the limiting amplifier, the bandwidth of the limiting amplifier must be large enough. [0003] Limiting amplifiers usually use a cascaded structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G11/00H03F3/68
CPCH03G11/00H03F3/68
Inventor 徐沛黄海峰
Owner ZHENJIANG COLLEGE
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