Variable frequency ring oscillator and phase locked loop circuit

Details Variable frequency ring oscillator and phase locked loop circuit Variable frequency ring oscillator and phase locked loop circuit

1997-02-20

1999-01-19

Grimm, Siegfried H.

Oscillators

Ring oscillators

331 34, 331179, H03B 502, H03L 7099

Patent

active

058617809

ABSTRACT:
A ring oscillator having an odd number of inverters selectively connected in a ring-like form includes a changing circuit for changing the ring-like connection by selectively returning the output of an arbitrary odd-numbered one of the inverters as the input to the initial-stage inverter. A phase locked loop circuit having this ring oscillator is also formed using this technique.

REFERENCES:
patent: 4978927 (1990-12-01), Hausman et al.
patent: 5075640 (1991-12-01), Miyazawa
patent: 5257294 (1993-10-01), Pinto et al.
patent: 5349311 (1994-09-01), Mentzer
patent: 5389898 (1995-02-01), Taketoshi et al.
patent: 5418499 (1995-05-01), Nakao
patent: 5448205 (1995-09-01), Rothermel
patent: 5490182 (1996-02-01), Arai
patent: 5689213 (1997-11-01), Sher

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