Optimized switched capacitor biquads for two-channel quadrature-mirror filter bank

Performance optimization methods for switched-capacitor biquadratic filters

“…The performance of the optimization method is compared on a design of biquads for a 4 th order two-channel filter bank [15]. The 3 rd order two-channel filter bank has been designed in [18], with implementation aspects discussed in [19].…”

“…Although some circuit part properties effects on block functions can be predicted [3] such as finite OpAmp gain or bandwidth, other effects such as the nonlinear large signal behaviour also influence the resulting function and are topology dependent. Therefore simulations were performed with our designed folded cascode OpAmp [15,20]. Due to low offset OpAmp design ( V off = 58 µV) the capacitances of input differential pair is not negligible and affects the biquad transfer characteristic.…”

“…This paper investigates and addresses the effectivity of different optimization algorithms (mainly DE and PSO based) applied to a SC filter circuit design that is a 4 th order two-channel filter bank [14] in 0.35 µm CMOS technology. This design was the focus of our previous work [15]. The developed algorithm in this paper focuses on the speed and robustness of the optimization method applied to optimization of the frequency responses of the Fleischer-Laker biquadratic SC filters [1].…”