Programmable temperature-compensated RC oscillator

Details Programmable temperature-compensated RC oscillator Programmable temperature-compensated RC oscillator

2007-02-13

2007-02-13

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S143000, C331S176000

Reexamination Certificate

active

11200329

ABSTRACT:
An on-chip oscillator generates a substantially temperature-independent clock signal by compensating for temperature-induced changes in its RC time constant and in a range between trigger voltages. A resistor with a positive temperature coefficient determines the range between trigger voltages, which increases with increasing temperature. A comparator response time contributes to a delay period that occurs after a trigger voltage is passed and before the charging or discharging of a capacitor is reversed. After the delay period, a remainder period elapses before another trigger voltage is passed. As temperature increases, the delay period is decreased by increasing a bias current supplied to the comparator. The bias current is programmably adjusted such that the sum of the delay period and the remainder period remains substantially constant over a large temperature range. Temperature trim bits are written to a register to adjust the bias current to compensate for process variations and simulation inaccuracies.

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