Oscillators – Plural oscillators – Parallel connected
Patent
1990-02-05
1993-07-27
Grimm, Siegfried H.
Oscillators
Plural oscillators
Parallel connected
331100, 331117R, 331117D, 331177V, H03B 512, H03B 518
Patent
active
052313611
ABSTRACT:
The present invention resides in a push-push voltage controlled oscillator (VCO) utilizing parallel LC resonant tank circuits for improved phase noise characteristics. The push-push VCO of the present invention includes two voltage controlled oscillators connected in parallel and in phase opposition, with each oscillator including a transistor connected in series with the parallel LC resonant tank circuit. The oscillators operate at the same resonant frequency f.sub.0, but are 180 degrees out of phase. Therefore, the fundamental and odd harmonics of the resonant frequency f.sub.0 cancel each other out and the even harmonics add together to produce an output signal at twice the resonant frequency f.sub.0.
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Allen Barry R.
Smith Duncan M.
Grimm Siegfried H.
Steinberger James M.
Taylor Ronald L.
TRW Inc.
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