Oscillators – Ring oscillators
Patent
1997-09-04
1998-11-03
Grimm, Siegfried H.
Oscillators
Ring oscillators
331177R, H03B 100
Patent
active
058314865
ABSTRACT:
An oscillator circuit includes biasing branches in the input section for permitting the oscillator gain and center frequency to be easily adjusted depending on design requirements. Accordingly, the oscillator circuit can be designed so as to have a lower overall gain and bandwidth yet operative at desired high frequencies. An output section includes a high-swing cascode current mirror for rejecting noise perturbations on the power supply so that they do not enter the oscillator stage, thus reducing jitter in the PLL frequency. The output section can be biased by a current mirror section so as to feed back an output voltage to one of the biasing branches of the input section, further lowering the overall gain and bandwidth of the oscillator circuit.
REFERENCES:
patent: 5302919 (1994-04-01), Abe
patent: 5680038 (1997-10-01), Fiedler
J. Babanezhad and R. Gregorian, "A Programmable Gain/Loss Circuit", IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987, pp. 1082-1090.
H. Meyr and G. Ascheid, "Phased-Locked Loop Fundamentals", Synchronization in Digital Communications, 1990, pp. 21-97, John Wiley & Sons, New York.
Grimm Siegfried H.
Integrated Device Technology Inc.
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