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Programmable Amplifier Circuit

An amplifier circuit and amplifier technology, applied in the field of electronics, can solve the problems of resistance drop, actual resistance drop of feedback resistor, etc., and achieve the effect of large feedback resistance

Active Publication Date: 2021-03-12
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, conventional DC-coupled amplifier circuits have a leakage current flowing from the feedback resistor of the DC-coupled amplifier to the input terminal of the DC-coupled amplifier, thereby necessarily causing the actual resistance of the feedback resistor to drop and becomes smaller than the value designed by the user
In applications where the user designs the resistor to a larger value, such as audio signal processing, a drop in actual resistance will cause more serious problems

Method used

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Embodiment Construction

[0017] Certain terms are used throughout the specification and following claims to refer to particular components. Those skilled in the art should understand that hardware manufacturers may use different names to refer to the same component. This document does not use the difference in name as a way to distinguish components, but uses the difference in function of components as a criterion for distinguishing. In the following description and claims, the terms "comprising" and "comprising" are open-ended terms, so they should be interpreted as "including but not limited to". In addition, the term "coupled" herein includes direct and indirect electrical connection means. Therefore, if a device is coupled to another device, it means that the one device may be directly electrically connected to the other device, or indirectly electrically connected to the other device through other devices or connecting means.

[0018] Different from the conventional switched-capacitor resistor,...

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Abstract

The invention discloses a programmable amplifier circuit, wherein a programmable amplifier circuit may include: an amplifier; an input capacitor coupled to the input terminal of the amplifier for receiving an input signal; a feedback capacitor coupled to the The input terminal of the amplifier and the output terminal of the amplifier; the voltage scaling circuit, coupled between the input terminal of the amplifier and the output terminal of the amplifier, is used to simulate a feedback resistor element to reduce the The voltage magnitude of the signal generated at the output to generate a feedback signal to the input of the amplifier. Embodiments of the present invention may provide large or larger feedback resistors.

Description

【Technical field】 [0001] The invention relates to the field of electronic technology, in particular to a programmable amplifier circuit. 【Background technique】 [0002] Regarding signal processing, conventional mechanisms may use conventional AC-coupled (AC-coupled) amplifiers or use conventional DC-coupled (DC-coupled) amplifiers to process the input signal with a programmed gain. In practical applications, the input capacitor of the traditional AC-coupled amplifier has a large capacitance and is usually arranged on an external printed circuit board instead of in the integrated circuit of the amplifier, so the cost is relatively high. In order to solve the above-mentioned problems of the conventional AC-coupled amplifier, the conventional DC-coupled amplifier uses a differential circuit structure, the gain of which is determined by the input capacitor and the feedback capacitor, so that the input capacitor can be designed to be smaller. [0003] However, conventional DC-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/30H03F1/34H03F3/45
CPCH03F1/303H03F1/34H03F3/45475H03F2200/156H03F3/005H03F2203/45512H03F2203/45514H03F2203/45526H03F2203/45528H03F2203/45594H03G1/0094H03G3/001H03F2200/504
Inventor 林振坚温松翰张育诚
Owner MEDIATEK INC