Frequency controlled ring oscillator having by passable stages

Details Frequency controlled ring oscillator having by passable stages Frequency controlled ring oscillator having by passable stages

1997-02-13

1998-09-29

Nelms, David C.

Oscillators

Ring oscillators

331108C, H03B 2700

Patent

active

058150439

ABSTRACT:
An improved ring oscillator in which frequency drift is controlled to provide reasonable accuracy is disclosed. The improved ring oscillator eliminates the frequency drift due processing variances. The ring oscillator provided by the invention incurs substantially less frequency drift than a conventional ring oscillator, but the frequency of the ring oscillator is still dependent on temperature and voltage changes. The improved ring oscillator according to the invention is particularly suited for operating as a localized oscillator that is used to facilitate periodic refreshing of DRAM within a computer.

REFERENCES:
patent: 4105950 (1978-08-01), Dingwall
patent: 5262735 (1993-11-01), Hashimoto et al.
patent: 5418499 (1995-05-01), Nakao
patent: 5471176 (1995-11-01), Henson et al.

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