Abstract
This paper presents a synthesis method and practical design considerations for the Coupled-Single-Amplifier-Biquad (CSAB) realization of all-pole symmetrical bandpass (BP) filters. The CSAB topology consists of a cascade of second-order SAB bandpass sections, together with negative feedback around adjacent sections. A straightforward procedure that leads to the block diagram representation of the CSAB is shown. Explicit design formulas are given for the optimum element values of the Deliyannis-Friend SAB bandpass section, as well as for the feedback resistors. This CSAB design offers improved performance over the cascade SAB approach without using additional operational amplifiers. Also described are the effects on the filter response due to finite amplifier gain, capacitor dissipations, noninfinite pole-Q sections, and their compensation techniques. These are followed by discussions on maximizing the filter dynamic range and tuning.
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