科研之友
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摘要
We propose the use of nonlinear least squares optimization to approximate the passband ripple characteristics of traditional Chebyshev lowpass filters with fractional order steps in the stopband. MATLAB simulations of (1 + alpha), (2 + alpha), and (3 + alpha) order lowpass filters with fractional steps from alpha = 0.1 to alpha = 0.9 are given as examples. SPICE simulations of 1.2, 1.5, and 1.8 order lowpass filters using approximated fractional order capacitors in a Tow-Thomas biquad circuit validate the implementation of these filter circuits.
- 出版日期2015
