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RC-Amplifier Resonators for Active Filters

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1 Author(s)

Active filters may consist of a cascade of isolated resonators, with each resonator supplying a single pair of complexconjugate poles. This paper supplies a detailed analysis of some RC -amplifier resonators whose characteristics are well suited for practical filters. The calculations are facilitated by a set of sensitivity identities. One resonator, taken from the Sallen and Key catalog, is shown to have extremely low passive sensitivities: S_{Z}^{Q} = \pm frac{1}{6} for all passive elements. Active Q multiplication is used to extend the usefulness of the circuit. Analysis of the dualintegrator feedback resonator shows that it is notably insensitive to amplifier parasitics. Finally, the dual-integrator concept is realized in a resonator that uses only two amplifiers. The several resonators supply a range of useful pole- Q 's from low values to several hundred.

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Circuit Theory, IEEE Transactions on  (Volume:15 ,  Issue: 4 )