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The time constant ? of a switched-capacitor (s.c.) integrator is C/(fcCR), where CR is the value of the s.c., C the integrating capacitor and fc the clock frequency. For a given ?, if fc is to increase, C/CR must increase proportionately. Since a large capacitor ratio C/CR is inconvenient to implement in an integrated circuit, most s.c. filters are clocked at the Nyquist rate. Since higher clock rates...
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