Abstract
A comparative study of single-amplifier filters, fifteen different two-amplifier circuits, and the state-variable three-amplifier configuration is given. The figures-of-merit used are the passive sensitivities, the \omega_0 gain-sensitivity products, the Q gain-sensitivity products, and the \omega_0 and Q deviations due to the amplifiers' limited bandwidth. In addition, practical matters such as input impedance and component spread are considered. Among the circuits considered a particular twoamplifier resonator emerges as the best biquadratic section. Some of the interesting results include a unified expression, applicable to a large class of low-sensitivity circuits, for the \omega_0 deviation due to the amplifier's limited frequency response. In this expression, which applies for all active filters which have low \omega_0 active sensitivities, the only configurationdependent quantities are the Q gain-sensitivity products.
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