Biquad alternatives for high-frequency switched-capacitor filters |
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Abstract: | Biquad sections are the basic building block of practical switched-capacitor (SC) filters. The authors focus on the amenability of various biquad options for high-frequency operation. A comparison on the basis of analysis and a recent nonideal SC network simulation tool are confirmed by results from a VLSI 1.25-/spl mu/m CMOS test chip. A differencing-input SC biquad is shown to have a significant performance advantage over other circuits. |
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