Digital voltage controlled oscillator having a ring oscillator w

Details Digital voltage controlled oscillator having a ring oscillator w Digital voltage controlled oscillator having a ring oscillator w

1992-05-26

1993-08-03

Mis, David

Oscillators

Polyphase output

331 1A, H03B 2700, H03L 706, H03L 7099

Patent

active

052333167

ABSTRACT:
A digital VCO is disclosed which comprises a ring oscillator formed of a plurality of inverters connected in series, each inverter being capable of controlling its delay amount, a frequency controlling circuit for controlling the oscillation frequency of the ring oscillator to coincide with a reference frequency, a selector switch for selecting specified output taps from output taps, each thereof being provided for each of the plurality of inverters, to take out the outputs therefrom, and switching control means for controlling the output taps from which the outputs are taken out to be cyclically switched through the selector switch.

REFERENCES:
patent: 4494021 (1985-01-01), Bell et al.
patent: 4706040 (1987-11-01), Mehrgardt
patent: 4902986 (1990-02-01), Lesmeister
patent: 5068628 (1991-11-01), Ghoshal
patent: 5119045 (1992-06-01), Sato
patent: 5126691 (1992-06-01), Mijuskovic et al.

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