Oscillation with multiple series circuits in parallel

Details Oscillation with multiple series circuits in parallel Oscillation with multiple series circuits in parallel

2005-08-16

2005-08-16

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S03600C

Reexamination Certificate

active

06930562

ABSTRACT:
The present invention provides an oscillator or PLL circuit which can balance the characteristics of a circuit without being affected by noise from a signal line or a supply line. There is provides an oscillator comprising a resonance circuit has a first series connected circuit having coils and a power terminal, a second series connected circuit having capacitors and a varactor having directional characteristics, and a third series connected circuit having capacitors and a varactor having directional characteristics. The first, second, and third series connected circuits are connected in parallel. The varactors are connected so as to have opposite directionalities with respect to a connection side of the second and third series connected circuit. The capacities of the varactors are varied by external control. The varied capacities determine an oscillation frequency.

REFERENCES:
patent: 5422603 (1995-06-01), Soyuer
patent: 5434545 (1995-07-01), Burchfield
patent: 5781048 (1998-07-01), Nakao et al.
patent: 6292065 (2001-09-01), Friedman et al.
patent: 2000-224027 (2000-08-01), None
Li Lin et al., “A 1.4GHx Differential Low-Noise CMOS Frequency Synthesizer using a Wideband PLL Architecture”, Digest of Technical Papers, 2000 IEEE International Solid-State Circuits Conference, pp. 204 and 205.

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