Start-stop transistor colpitts oscillator circuit

Details Start-stop transistor colpitts oscillator circuit Start-stop transistor colpitts oscillator circuit

1975-04-24

1976-11-09

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331173, H03B 512

Patent

active

039913880

ABSTRACT:
A start-stop oscillator circuit in which the oscillator circuit includes an inductor connected in parallel with a pair of serially connected capacitors. The inductor and capacitors form the tank circuit for the oscillator which is in the form of a Colpitts oscillator. In order to start and stop the oscillator within a brief period, not to exceed the conventional blanking interval for a television, switches are connected between one end of the inductor and ground and from a point between the capacitors to ground. The end of the inductor opposite the end to which the switch is connected and the corresponding end of the capacitor branch are also connected to ground. The switches, when closed, dump the tank circuit extremely quickly and when opened permit the oscillator to start up relatively quickly, whereby the complete interval of stopping the oscillator and again starting the oscillator can take place within the required brief period of time corresponding to a conventional horizontal blanking pulse in a television system.

REFERENCES:
patent: 2905907 (1959-09-01), Sanders
patent: 3229227 (1966-01-01), Popodi

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