Oscillator mode suppression apparatus having bandpass effect

Details Oscillator mode suppression apparatus having bandpass effect Oscillator mode suppression apparatus having bandpass effect

H - Electricity

03

B

331/50

H03B 5/30 (2006.01) H03B 5/08 (2006.01) H03B 5/32 (2006.01)

Patent

CA 1132209

OSCILLATOR MODE SUPPRESSION APPARATUS HAVING BANDPASS EFFECT Abstract An apparatus utilizing the basic oscillation character- istics of the Colpitts or Pierce and Hartley oscillator con- figurations. In this embodiment the basic shunt reactive shunt arms are replaced with a selected pair of tank circuits or one of the shunt arms with a series-parallel tank circuit. These tank circuits are tuned such that the sign of their effective reactances are the same between the range of resonant frequencies of the individual tank circuits or of the series and parallel resonant frequencies of the series-parallel tank. When this occurs and their sign differs from the sign of the effective reactance of the series reactive element, there is a 180° signal phase shift in the feedback loop, and therefore oscillation.

342391

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