Oscillator based tamperproof precision timing circuit

Details Oscillator based tamperproof precision timing circuit Oscillator based tamperproof precision timing circuit

1996-09-30

1998-12-01

Mis, David

Oscillators

Solid state active element oscillator

Transistors

331 74, 331143, 331175, 331186, 327 48, 327 49, H03B 524, H03B 504, H03K 5125

Patent

active

058444467

ABSTRACT:
An oscillator that has a substantially-constant voltage source configured such that it does not require the voltage source to be tuned to a particular voltage to oscillate a particular frequency. The oscillator has greater precision and reliability since the inputs of the comparator are periodically switched to reduce the effects of comparator bias and to equalize the voltage stresses on the inputs of the comparator. Greater precision is also achieved through the use of a discrete resistor and a discrete capacitor to define the frequency of the oscillator. The present invention provides an oscillator and method to generate a periodic signal that is tamperproof because the circuitry that defines the period is either integrated onto the integrated circuit or contained within the package containing the integrated circuit. The oscillator may be used as a frequency reference in a speed governor circuit and that speed governor may be included in an integrated circuit such that the speed governor disables a functional block of the integrated circuit when the clock frequency exceeds a frequency limit.

REFERENCES:
patent: 3742384 (1973-06-01), Breitzmann et al.
patent: 3748591 (1973-07-01), Visioli, Jr. et al.
patent: 3911374 (1975-10-01), Busse et al.
patent: 5107523 (1992-04-01), Heaney et al.
patent: 5274337 (1993-12-01), Young et al.
patent: 5280605 (1994-01-01), Young et al.
patent: 5508664 (1996-04-01), Rizzo

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