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Center frequency and Q tuning of biquad filter by amplitude-limited oscillation-based calibration
Center frequency and Q tuning of biquad filter by amplitude-limited oscillation-based calibration
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机译:基于幅度限制的基于振荡的校准双二阶滤波器的中心频率和Q调谐
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摘要
Certain aspects of the present disclosure provide methods and apparatus for calibrating a tunable active filter. One example apparatus is a filter circuit that generally includes a tunable active filter comprising at least one amplifier and a first feedback path coupled between an input and an output of the at least one amplifier, the first feedback path comprising at least one switch; and an amplitude limiter coupled to the tunable active filter and comprising at least one transistor disposed in a second feedback path coupled between the input and the output of the at least one amplifier.
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