Process, supply, and temperature insensitive integrated time...

Details Process, supply, and temperature insensitive integrated time... Process, supply, and temperature insensitive integrated time...

2005-04-07

2009-10-06

Pascal, Robert (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S111000, C331S143000

Reexamination Certificate

active

07598822

ABSTRACT:
Precision integrated time reference circuits are disclosed. Preferred embodiments provide time reference circuits that are relatively insensitive to variations in process, supply, and temperature. A preferred embodiment of the invention is disclosed in which a relaxation oscillator according to the invention includes a reference voltage circuit configured to maintain a reference voltage in proportion to actual circuit resistance values. Aspects of the invention also include dynamic compensation for variations in temperature.

REFERENCES:
patent: 5180995 (1993-01-01), Hayashi et al.
patent: 6091286 (2000-07-01), Blauschild
patent: 6356161 (2002-03-01), Nolan et al.
patent: 6496056 (2002-12-01), Shoji
patent: 6917249 (2005-07-01), Kuo et al.

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