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基于当前反操作放大器和商用AD844集成电路的新型通用活性波器的设计和验证

Hua-Pin Chen1, I-Chyn Wey2, Liang-Yen Chen2

  • 1Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan.

Sensors (Basel, Switzerland)
|October 14, 2023
PubMed
概括

本研究引入了一种使用电流反操作放大器 (CFOA) 的全新通用活性波器. 该设计提供了高集成和低功耗的多功能过功能.

关键词:
模拟电路设计模拟电路设计实现芯片实现的芯片实现这是一个通用过器.电压模式过器过器

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Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Op Amp AC Circuits01:18

Op Amp AC Circuits

Within an audio system, the filter circuit plays a pivotal role in processing the amplified audio signal from an amplifier. Its primary function is significantly attenuating signal components with lower frequencies, thereby shaping the audio output. This circuit's operations are examined, focusing on the fundamental filter configuration. This configuration involves an operational amplifier arranged in an inverting setup coupled with resistors (R1 and R2) and a capacitor (C1).
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Design Example: Vintage Mixing Console01:17

Design Example: Vintage Mixing Console

A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
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Operational Amplifiers01:17

Operational Amplifiers

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Implementing second-order low-pass filters in audio systems is crucial in refining audio signals by eliminating undesirable high-frequency noise. These filters typically involve second-order op-amp circuits configured as voltage followers, encompassing two nodes with distinct storage elements.
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Characteristics of OpAmp

The operational amplifier, commonly known as an op-amp, is a specially designed electronic circuit component. Its purpose is to work in conjunction with other circuit elements to execute a defined signal-processing operation. Consider an equivalent circuit model of an op-amp, as depicted in Figure 1; the output section comprises a voltage-controlled source in parallel with the output resistance Ro.
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