Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2006-09-05
2006-09-05
Kinkead, Arnold (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S143000, C331S176000, C331S175000
Reexamination Certificate
active
07102452
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 is part of 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 the other trigger voltage is passed. As temperature increases, the oscillator increases current supplied to a comparator to decrease the response time. Moreover, as temperature increases, the oscillator increases a charge/discharge current so that the capacitor charges and discharges faster as the range between trigger voltages increases. The delay period and the remainder period are adjusted so that their sum remains substantially constant over a large temperature range.
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Kinkead Arnold
Silicon Edge Law Group LLP
Wallace Darien K.
ZiLOG, Inc.
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