Abstract
Abstract state-variable technique is employed in the realization of a multifunctional active-C biquadratic filter. The basic block is shown to give simultaneously low-pass (LP), band-pass (BP) and band-elimination (BE) responses. The use of only two operational amplifiers (OA's) and ratioed capacitors makes the circuit highly suitable for MOS implementation. The effects of circuit parasitics and excess phase introduced by the OA's are shown to be accountable for in the design. Experimental results show good agreement with the theory.
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