Title :
SC and SI filters in baseband applications: a comparison
Author :
Helfenstein, Markus ; Muralt, Arnold ; Fischer, Godi ; Zbinden, Paul ; Pfaff, Dirk ; Frey, Felix ; Moschytz, George S.
Author_Institution :
Inst. for Signal & Inf. Process., Swiss Federal Inst. of Technol., Zurich, Switzerland
Abstract :
Based on measurements of two IC chips, a comparison between switched-capacitor (SC) and switched-current (SI) bandpass filters is presented. The filters are sampled with clock frequencies up to 10 MHz and the nominal center frequency ωp is 500 kHz with a pole-Q of 10. The focus of the presentation is on implementation issues, such as low voltage supply operation and PSRR. It is shown that in the SI case the design can be made independent of the modulation index m, which results in superior circuit behavior for large input signals. The application under consideration is in telecommunications where analog filtering tasks often take place in the baseband
Keywords :
Q-factor; active filters; band-pass filters; switched capacitor filters; switched current circuits; 500 kHz; IC chips; PSRR; SC filters; SI filters; analog filtering tasks; bandpass filters; baseband applications; clock frequencies; input signals; low voltage supply operation; modulation index; nominal center frequency; pole-Q; Band pass filters; Baseband; Circuits; Clocks; Filtering; Frequency; Low voltage; Modulation; Semiconductor device measurement; Signal design;
Conference_Titel :
Circuits and Systems, 1997. ISCAS '97., Proceedings of 1997 IEEE International Symposium on
Print_ISBN :
0-7803-3583-X
DOI :
10.1109/ISCAS.1997.608712
