Title :
Design of low-power switched-capacitor filter with switched-opamp technique
Author :
Lee, Shuenn-Yuh ; Lee, Shyh-Chyang
Author_Institution :
Dept. of Electr. Eng., Nat. Chung-Cheng Univ., Chia-Yi, Taiwan
Abstract :
The modified switched-capacitor biquad circuits for low-Q and high-Q structures are presented in This work. By using the switched-opamp technique, the structures make only one active opamp in each phase without destroying their biquad functions. This idea can be applied on the implementation of high-order SC filters to save more power consumption. Meanwhile, the z-domain transfer functions for SC biquad circuits are analyzed to verify the modified structures. Finally, three types of low-Q SC biquad filters are presented as design examples. The simulation results show that the frequency responses of the general active-RC biquad circuits and the modified SC ones are much similar.
Keywords :
RC circuits; biquadratic filters; frequency response; low-power electronics; operational amplifiers; switched capacitor filters; SC biquad circuit; active-RC biquad circuit; biquad function; frequency response; high-Q structure; high-order SC filter; low-Q structure; low-power switched-capacitor filter; power consumption; switched-capacitor biquad circuit; switched-opamp technique; z-domain transfer function; Band pass filters; CMOS technology; Circuit analysis; Circuit simulation; Clocks; Energy consumption; Frequency; Operational amplifiers; Switching circuits; Transfer functions;
Conference_Titel :
Circuits and Systems, 2004. Proceedings. The 2004 IEEE Asia-Pacific Conference on
Print_ISBN :
0-7803-8660-4
DOI :
10.1109/APCCAS.2004.1412737
