Variable frequency LC oscillator using variable impedance and ne

Details Variable frequency LC oscillator using variable impedance and ne Variable frequency LC oscillator using variable impedance and ne

1994-12-15

1996-01-23

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331117R, 331167, 331177R, H03B 512, H03B 706

Patent

active

054867940

ABSTRACT:
A variable frequency oscillator which can be implemented entirely in a semiconductor chip, which is variable over a broad frequency range and which has relatively low phase noise, includes a variable impedance circuit, a reactive load connected to an output terminal pair of the variable impedance circuit, and a negative impedance circuit having an output terminal pair connected to the output terminal pair of the variable impedance circuit. In one embodiment, the negative impedance circuit has an input terminal pair connected to an input terminal pair of the variable impedance circuit to serve as a positive feedback path for the variable impedance circuit. In another embodiment, the negative impedance circuit includes a pair of level shifters which ensure that the variable impedance circuit is properly biased and works in a forward active region.

REFERENCES:
patent: 4234858 (1980-11-01), Gomi
patent: 4243953 (1981-01-01), Balaban et al.
patent: 4801898 (1989-01-01), Obayashi

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