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Practical techniques are given for reducing the number of operational amplifiers (op‐amps) in switched capacitor filters. Op‐amp count is typically reduced to one op‐amp per pole pair, while maintaining the insensitivity to top and bottom plate parasitics heretofore associated with one‐op‐amp‐per‐pole structures. These techniques are used to develop a parasitic insensitive single amplifier resonator and a general single amplifier biquad. Next, complete design procedures are given for these circuits. Finally, the same methods are applied to leapfrog structures, where similar op‐amp savings are demonstrated.

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