Layout of analog and mixed analog-digital circuits
Design of analog-digital VLSI circuits for telecommunications and signal processing
A 9.6 kb/s CMOS FSK modem for data transmission through power lines
Proceedings of the 20th annual conference on Integrated circuits and systems design
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This paper describes the design and implementation of asecond-order switched-capacitor (SC) bandpass (BP) filter with verywide quality factor (Q) programmability range. The filterselectivity is digitally programmed by varying the effectivesampling frequency of an SC branch, without modifying any capacitorvalue. The proposed approach allows a quasi-continuousQ-factor tunability avoiding, in principle, the inherentquantization error associated to any traditional programmingtechnique. Automatic Q-factor tuning is performed by using ascheme based on an amplitude-locking loop approach. Experimentalresults obtained from a 0.8-µm CMOS integrated prototypedemonstrate the versatility of the proposed technique forhigh-Q SC BP filters.