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A fully integrated, low-distortion, balanced, continuous-time filter fabricated in 5-V, 1.6- mu m CMOS is presented. Active RC structures are used in a leapfrog topology, with time constants set by integrated passive resistors and capacitors. Accurate tuning is achieved by selection of capacitor elements under the control of a new calibrator circuit. With a 2-V/sub rms/ differential input and output, the filter achieves -94-dB THD (total harmonic distortion) and 95-dB signal-to-noise ratio. Tuning accuracy is maintained to within +or-5% of nominal over the commercial temperature range.>
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Durham et al. (1993) studied this question.
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