COMPOSITE NEGATIVE FEEDBACK TYPE FREQUENCY SELECTIVE OUTPUT CIRCUIT AND OSCILLATION CIRCUIT UTILIZING SAME

摘要

The purpose of the present invention is to provide a composite negative feedback type frequency selective output circuit that is capable of obtaining an output signal with a high Q value for the resonance quality factor and an oscillation circuit that utilizes the composite negative feedback type frequency selective output circuit. The composite negative feedback type frequency selective output circuit includes a feedback path for frequency-selectively relaying only the remaining component other than the rejecting frequency band of an in-phase signal (or a reverse-phase signal) of a feedback-processed signal that has been obtained by negatively feeding a feedback signal back to an input frequency signal, and for tentatively relaying at least the real number component of the other signal and then relaying the difference between said selective relay output and the relay output of the real number component (or the sum) as the feedback signal. The gain of the loop containing this feedback path can be changed and set manually or automatically as desired.