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首页> 外文期刊>IEEE Journal of Solid-State Circuits >An adaptive analog continuous-time CMOS biquadratic filter
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An adaptive analog continuous-time CMOS biquadratic filter

机译：自适应模拟连续时间CMOS双二次滤波器

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摘要

An adaptive analog continuous-time biquadratic filter is realized in a 2- mu m digital CMOS process for operation at 300 kHz. The biquad implements the notch, bandpass and low-pass transfer functions. The only parameter adapted is the resonant frequency of the biquad, which is identical to the notch frequency and the bandpass center frequency. The update method is based on a least-means-square algorithm which adapts the notch frequency to minimize the power at the notch filter output. The actual update is modified to reduce the circuit complexity to one biquad and one correlator. When the filter is tracking a sinusoid, this update generates a ripple-free gradient that decreases tracking error. Applications include phase-frequency detectors, FM demodulators (linear and frequency shift keying), clock extractors, and frequency acquisition aids for phase-locked loops and Costas loops. Measured results from experimental prototypes are presented. Nonidealities of an all-analog implementation are discussed, along with suggestions to improve performance.
机译：自适应模拟连续时间双二次滤波器通过2微米数字CMOS工艺实现，工作频率为300 kHz。 biquad实现了陷波，带通和低通传输功能。唯一适用的参数是双二阶谐振频率，该频率等于陷波频率和带通中心频率。更新方法基于最小均方算法，该算法调整陷波频率以最小化陷波滤波器输出的功率。修改了实际更新，以将电路复杂度降低到一个双二阶和一个相关器。当滤波器跟踪正弦波时，此更新将生成无纹波梯度，从而减小跟踪误差。应用包括相频检测器，FM解调器（线性和频移键控），时钟提取器以及用于锁相环和Costas环的频率采集辅助工具。给出了实验原型的测量结果。讨论了全模拟实现的非理想性，以及提高性能的建议。

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