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Operational Amplifier-Based Circuits

A technology of operational amplifiers and circuits, applied in the field of signal processing, can solve the problems of noise index attenuation, increase of output signal noise of transimpedance amplifiers, etc.

Active Publication Date: 2019-01-08
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduced source impedance of the transimpedance amplifier will increase the noise in the output signal of the transimpedance amplifier, thus causing the noise index attenuation at the edge of the signal path

Method used

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  • Operational Amplifier-Based Circuits
  • Operational Amplifier-Based Circuits
  • Operational Amplifier-Based Circuits

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Embodiment Construction

[0013] Certain terms are used in the description and claims to refer to particular elements. Those skilled in the art should understand that manufacturers of electronic devices may use different terms to refer to the same component. The specification and claims do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The "comprising" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". Otherwise, the term "coupled" includes any direct and indirect means of electrical connection. Therefore, if it is described herein that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

[0014] figure 1 It is a schematic block diagram...

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Abstract

The present invention provides a circuit based on an operational amplifier, including an operational amplifier, a feedback circuit and a compensation circuit block, wherein the feedback circuit is coupled between an output port and an input port of the operational amplifier, and the compensation circuit The block has a circuit for stability compensation of the operational amplifier, wherein the stability compensation circuit is not driven on the output port of the operational amplifier.

Description

【Technical field】 [0001] The present invention relates to signal processing, and more particularly, to an operational amplifier based circuit with a compensation circuit block for stability compensation. 【Background technique】 [0002] With the evolution of wireless communication systems, the bandwidth of the baseband becomes wider. Therefore, broadband systems require more stringent receiver specifications, such as a long term evolution advanced (LTE-advanced) to ensure the quality of received signals. system. For example, to avoid noise figure (NF) degradation at the signal channel edge, it cannot be used between a mixer and an operational amplifier-based circuit (such as a transimpedance amplifier). A current-mode capacitor-resistor filter (such as a low-pass filter) in between to filter blocker signals at the edge of the signal path. If the current-mode capacitor-resistor filter is set to filter the intercepted signal at the edge of the signal channel, the source imped...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F1/32H03F3/45
CPCH03F1/086H03F1/14H03F1/483H03F3/45183H03F3/45659H03F2200/129H03F2200/135H03F2200/144H03F2200/153H03F2200/165H03F2200/411H03F2200/555H03F2200/75H03F2200/91H03F2203/45036H03F2203/45074H03F2203/45082H03F2203/45088H03F2203/45116H03F2203/45134H03F2203/45151H03F2203/45156H03F2203/45178H03F2203/45188H03F2203/45208H03F2203/45264H03F2203/45332H03F2203/45336H03F2203/45338H03F2203/45418H03F2203/45422H03F2203/45424H03F2203/45434H03F2203/45512H03F2203/45526H03F2203/45528H03F2203/45544H03F2203/45546H03F2203/45548H03F2203/45594H03F2203/45601H03F2203/45631H03F2203/45632H03F2203/45642H03F2203/45644H03F2203/45646H03F2203/45648H03F2203/45702H03F1/0205H03F1/42H03F3/193H03F3/45179H03F2203/45051
Inventor 虞继尧
Owner MEDIATEK INC