Oscillator circuits and methods that change frequency in...

Details Oscillator circuits and methods that change frequency in... Oscillator circuits and methods that change frequency in...

2006-04-18

2006-04-18

Mis, David (Department: 2817)

Oscillators

Relaxation oscillators

C331S111000, C331S175000, C331S17700V

Reexamination Certificate

active

07030707

ABSTRACT:
An oscillator includes a comparison voltage generating circuit, a comparing circuit and a clock switching circuit. The comparison voltage generating circuit is driven by a power source voltage, and generates comparison voltages that change in response to clock signals which have a frequency that varies in inverse proportion to the power source voltage and a first reference voltage. The comparing circuit compares levels of the comparison voltages to a second reference voltage and outputs logic signals having logic levels as a result of the comparison. The clock switching circuit outputs the clock signals which have a frequency that varies in inverse proportion to the power source voltage, in response to the logic signals.

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“Notification d'un Rapport de Recherche Preliminaire Avec Reponse Obligatoire” and “Rapport de Recherche Préliminaire” (Preliminary Search Report), French Application No. 04 07650, Aug. 3, 2005.
Tanzawa et al., “A Stable Programming Pulse Generator for High-Speed Programming Single Power Supply Voltage Flash Memories”,1995 Symposium on VLSI Circuits, IEEE, Jun. 8, 1995, pp. 73-74.

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