US PATENT SUBCLASS 331 / 105
WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS


Current as of: June, 1999
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331 /   HD   OSCILLATORS

105WITH PARASITIC OSCILLATION CONTROL OR PREVENTION MEANS


DEFINITION

Classification: 331/105

(under the class definition) Subject matter wherein the oscillator, when in operation, generates or tends to generate undesired spurious oscillations and wherein means are provided in the oscillator circuit to suppress, control or prevent the generation of such undesired oscillations.

(1) Note. The spurious oscillations may be caused, for example, by (1) parasitic resonant circuits formed by the tube leads and interelectrode capacitance of the active element of the oscillator, (2) secondary emission effects due to positive excursions of the grid of the active element of the oscillator which produces a negative resistance and causes the production of dynatron oscillations, (3) electron transit time effects, particularly in a tetrode or pentode, when the grid is positive with respect to cathode and output electrode, which effects may produce Barkhausen oscillations, and (4) the radio frequency chokes in the electrode biasing circuits which chokes may be of such values as to cause the generation of low frequency parasitic oscillations.

SEE OR SEARCH THIS CLASS, SUBCLASS:

88+, for magnetically controlled space discharge devices with means to stabilize the generated frequency.

175+, for oscillators in general with means to stabilize the generated frequency.