Abstract
An oscillatory closed-loop system with the cascade combination of a first-order all-pass network, an amplifier and a clipper is described. It is seen to generate a discontinuous oscillation whoso repetition rate is adjustable by gain variation of the amplifier. Replacing the all-pass network by a composite filter, comprising the all-pass network cascaded to an RC integrator, the system is seen to generate a continuous oscillation for a certain gain condition of the amplifier. Analysis of the two systems is made separately and the theoretical results are experimentally verified.
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