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首页> 外文期刊>IEEE transactions on circuits and systems . I , Regular papers >On the Evaluation of the Exact Output of a Switched Continuous-Time Filter and Applications
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On the Evaluation of the Exact Output of a Switched Continuous-Time Filter and Applications

机译：切换连续时间滤波器精确输出的评估及其应用

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摘要

In this paper, a study of the operation of switched continuous-time filters (SCTFs), defined as continuous-time filters with elements that are alternatively switched on and off in the signal path, is conducted. A well-known example is the use of switched resistors to multiply their value, but the universe of applications is wider. First, a detailed calculation of the output of an SCTF in the frequency domain, which allows the examination of any SCTF in a general framework, is presented. This result particularly explains the resistor multiplication effect. Three application examples using switched elements are presented and examined as SCTFs: a nonideal sample & hold, a switched active filter that is tuned by varying the duty cycle of the switching, and a switched $G_m$–$C$ filter to implement a chopper amplifier. In all cases, the theoretical background allows the examination of circuit behavior and limitations, and the analysis is supported by measurements or transient simulations.
机译：在本文中，对开关连续时间滤波器（SCTF）的操作进行了研究，开关连续时间滤波器被定义为具有在信号路径中交替打开和关闭的元件的连续时间滤波器。一个著名的例子是使用开关电阻器将其值相乘，但应用范围更广。首先，介绍了频域中SCTF输出的详细计算，该计算可以检查通用框架中的任何SCTF。该结果特别说明了电阻器的倍增效果。给出了三个使用开关元件的应用示例，并作为SCTF进行了检查：非理想采样和保持，通过改变开关占空比调整的开关有源滤波器和用于实现斩波器的开关$ G_m $ – $ C $滤波器放大器。在所有情况下，理论背景都可以检查电路的行为和限制，并且分析可以通过测量或瞬态仿真来支持。

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