Multiple feedback loop ring oscillator and delay cell

Details Multiple feedback loop ring oscillator and delay cell Multiple feedback loop ring oscillator and delay cell

1998-06-18

2000-07-25

Pascal, Robert

Oscillators

Ring oscillators

331177R, H03B 2700

Patent

active

060941030

ABSTRACT:
Disclosed is a multiple feedback loop ring oscillator and delay cell with high oscillation voltage. It is an object of the present invention to implement a new ring oscillator for the VCO of a high speed PLL and a proper delay cell with a high speed and low noise. The apparatus is composed of multiple feedback loop ring oscillator that 4 delay cells which have the first main input stage, the second main input stage, the first subsidiary input stage, the second subsidiary input stage, the third subsidiary input stage, the forth subsidiary input stage, the first output stage and the second output stage is connected to the main loop and subsidiary loop. The present invention has advantages that it can be operated in high speed, it has a low power sensitivity, there is no power noise because there is no variation of a supply current and it can improve noise characteristics.

REFERENCES:
patent: 5355097 (1994-10-01), Scott et al.
patent: 5426384 (1995-06-01), May
patent: 5457429 (1995-10-01), Ogawa et al.
patent: 5548251 (1996-08-01), Chou et al.
patent: 5841325 (1998-11-01), Knotts et al.
Aaron W. Buchwald, Kenneth W. Martin, Aaron K. Oki, and Kevin W. Kobayashi, A 6-GHz Integrated Phase-Locked Loop Using A1GaAs/GaAs Heterojunction Bipolar transistors, Dec., 1992, pp. 1752-1761.

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