Ring resonator oscillator usable in frequency synthesizers and c

Details Ring resonator oscillator usable in frequency synthesizers and c Ring resonator oscillator usable in frequency synthesizers and c

1995-07-31

1996-12-24

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 9, 331 36C, 331 46, 331 49, 331 76, 331 96, 455 76, 455325, H03B 518, H30L 7099

Patent

active

055876900

ABSTRACT:
A first oscillator includes: a ring resonator; an oscillation circuit having a negative resistance active circuit coupled to a first point on the ring resonator for oscillating at an oscillation frequency and resonating the resonator; an output terminal, coupled to a second point on the ring resonator where a voltage is substantially zero with respect to the predetermined frequency when the ring resonator resonates, for outputting a resonant frequency signal, wherein even order harmonic components are outputted with the fundamental component suppressed. A second oscillator includes a ring resonator having points A to D equidistantly dividing the ring resonator, first and second oscillation circuits coupled to the points A and B respectively, first and second grounding capacitors having capacitance equivalent to those of the first and second oscillation circuits. Thus, two independent oscillators which do not affect each other are provided with a single resonator. In the first and second oscillators, grounding capacitors, a resonant capacitor may be provided to miniaturize the oscillator. Variable capacitances may be provided to prevent the point from moving with a change in the controlled oscillation frequency. Frequency synthesizers and communication apparatus including the first or second oscillator are also disclosed.

REFERENCES:
patent: 4185252 (1980-01-01), Gerlach
patent: 4749963 (1988-06-01), Makimoto et al.
patent: 5289139 (1994-02-01), Fiedziuszko et al.
U. Tietze, CH. Schenk `Halbleiter-Schaltungstechnik, 9. Auflage` 1990, Springer, Berlin, Heidelberg, New York.
"Nonlinear Design and Experimental Results of a Low-Noise Varactor Tunable Oscillator Using a Coupled Microstrip" by V. Gungerich et al; 1992 IEEE MTT-S Digest; pp. 549-552.
"20-40-GHz Push-Push Dielectric Resonator Oscillator" by Anthony M. Pavio et al; IEEE Transactions on Microwave Theory and Techniques, vol. MTT-33, No. 12, Dec., 1985; pp. 1346-1349.

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