Zero phase startup for a tank type voltage controlled oscillator

Details Zero phase startup for a tank type voltage controlled oscillator Zero phase startup for a tank type voltage controlled oscillator

1988-07-11

1990-03-13

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331173, H03B 512, H03L 300

Patent

active

049085832

ABSTRACT:
A self contained circuit to enable a tank type (coil/capacitor) voltage controlled oscillator to start up and free run from a known state. The circuit allows the oscillator to be stopped to within two periods by invoking its only input logic signal and also restarted with no adverse effects on its free running operation. It includes three current mirrors, one which sets the current for the other two mirrors and of the final two, one actively sets a bias on a coil (stops oscillation) while the other makes up for the lack of coil bias by providing an equivalent amount current influx to the oscillator in the free running condition.

REFERENCES:
patent: 3991388 (1976-11-01), Harshbarger
patent: 4763086 (1988-08-01), Haight et al.
patent: 4799030 (1989-01-01), Haight et al.

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