Ring oscillator having automatic gain and low frequency shut off

Details Ring oscillator having automatic gain and low frequency shut off Ring oscillator having automatic gain and low frequency shut off

1997-12-22

1999-11-30

Grimm, Siegfried H.

Oscillators

Ring oscillators

331109, 331177R, 331183, H03B 502, H03L 500

Patent

active

059949694

ABSTRACT:
A ring oscillator with differential delay stages employs an automatic gain control circuit producing a gain adjust signal that is responsive to a frequency control voltage applied to the ring oscillator. The effect of the frequency control voltage on the output voltage of the ring oscillator is counterbalanced by the gain adjust signal which prevents the output voltages of the delay stages from varying excessively over frequency. Further, the output stage of the ring oscillator includes shut off circuitry that allows the ring oscillator to be shut off in a non-oscillating mode in which it draws little current.

REFERENCES:
patent: 4810975 (1989-03-01), Dias
patent: 5272453 (1993-12-01), Traynor et al.
patent: 5485114 (1996-01-01), Funakura et al.
patent: 5485126 (1996-01-01), Gersbach et al.
patent: 5568103 (1996-10-01), Nakashima et al.
patent: 5592126 (1997-01-01), Boudewijns et al.
A PLL Clock Generator with 5 to 110 MHz of Lock Range Microprocessors, IEEE Journal of Solid-State Circuits, vol. 27, No. 11, Nov. 1992, pp. 1599 through 1607.

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