Oscillators – With synchronizing – triggering or pulsing circuits – Triggering or pulsing
Reexamination Certificate
2007-12-19
2010-12-28
Pascal, Robert (Department: 2817)
Oscillators
With synchronizing, triggering or pulsing circuits
Triggering or pulsing
C331S055000, C331S057000
Reexamination Certificate
active
07859354
ABSTRACT:
Ring oscillator circuitry is provided. The ring oscillator circuitry may include a loop of inverters. A control gate may be interposed in the loop to control operation of the loop. The control gate may be activated using a ring oscillator trigger signal. During application of the trigger signal, the trigger signal may become degraded due to circuit parasitics. Trigger signal conditioning circuitry may be used to remove noise from the degraded trigger signal. A version of the trigger signal that has been conditioned by the trigger signal conditioning circuitry may be applied to a control input of the control gate. The trigger signal conditioning circuitry may include a low pass filter, a hysteresis circuit, and a two-stage buffer. The two-stage buffer may be formed from transistors with the same characteristics as the transistors in the inverters of the ring oscillator loop.
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Chen Shuxian
Watt Jeffrey T.
Altera Corporation
Goodley James E
Pascal Robert
Treyz G. Victor
Treyz Law Group
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