Oscillators – Ring oscillators
Patent
1997-11-07
2000-06-06
Mis, David
Oscillators
Ring oscillators
331 34, 331177R, 331179, 331185, H03B 524, H03L 7099
Patent
active
060723726
ABSTRACT:
With a VCO 1 which constitutes the voltage controlled oscillator according to the present invention, since NMOS transistors N11, N12 and N13 are provided in each of inverter circuits 11, 12 and 13, the oscillating frequency band can be divided into three sub ranges. As a result, even when the VCO gain effected by a control signal VCN is reduced, a wide frequency band is assured, thereby making it possible to easily support the clock frequency required by the system into which the VCO 1 is to be incorporated.
REFERENCES:
patent: 5142249 (1992-08-01), Hirotomi
patent: 5208557 (1993-05-01), Kersh, III
patent: 5416446 (1995-05-01), Holler, Jr. et al.
patent: 5446417 (1995-08-01), Korhonen et al.
patent: 5691661 (1997-11-01), Fukuda et al.
patent: 5703541 (1997-12-01), Nakashima
patent: 5777520 (1998-07-01), Kawahami
Mis David
OKI Electric Industry Co., Ltd.
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