Process compensation method for CMOS current controlled ring osc

Details Process compensation method for CMOS current controlled ring osc Process compensation method for CMOS current controlled ring osc

1997-05-21

1999-05-18

Mis, David

Oscillators

Ring oscillators

331 34, 331175, 331177R, 331185, 327288, H03B5/24;5/04

Patent

active

059054123

ABSTRACT:
A current controlled oscillator circuit comprising a "variable-ratio current mirror", for providing a variable output current that varies in response to process. The "variable-ratio current mirror" having a reference MOS transistor and a mirrored MOS transistor, and the reference MOS transistor has a greater predetermined channel length than the channel length of the mirrored MOS transistor. A second current mirror is coupled to the "variable-ratio current mirror" to provide a control current that decreases in response to an increase in the variable output current of the "variable-ratio current mirror." A multi-stage ring oscillator having a plurality of series-connected inverter stages is responsive to the control current of said second current mirror for controlling the frequency of oscillation of said multi-stage ring oscillator.

REFERENCES:
patent: 5061907 (1991-10-01), Rasmussen
patent: 5068553 (1991-11-01), Love
patent: 5331295 (1994-07-01), Jelinek et al.

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