Estimation of Aliasing Effects Due to Periodical Nonuniform Individual Sampling in High-Q Switched-Capacitor Filters |
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| Authors: | Hernandez-Garduno D Silva-Martinez J Ausin J L |
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| Affiliation: | Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX; |
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| Abstract: | The periodical nonuniform individual sampling scheme has been shown suitable for capacitance spread and total capacitor area reduction in high quality (Q) factor switched-capacitor (SC) filters. However, the use of periodical nonuniform clock signals results in additional aliasing components in the output spectrum. This paper presents a simple model to analyze the generation of such alias components and gives practical expressions to estimate their power. The results are verified through circuit simulation of a 10.7-MHz second-order SC bandpass filter in a 0.35-mum CMOS technology. Implications on the use of this technique in the design of intermediate-frequency filters are discussed |
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