Oscillators – With synchronizing – triggering or pulsing circuits – Triggering or pulsing
Reexamination Certificate
2007-05-24
2009-02-17
Mis, David (Department: 2817)
Oscillators
With synchronizing, triggering or pulsing circuits
Triggering or pulsing
C331S057000, C331S074000, C327S534000
Reexamination Certificate
active
07492232
ABSTRACT:
There is provided an oscillator circuit capable of obtaining stable frequency by avoiding output having unstable frequency that is likely to occur to an operation/stop-control-feasible type oscillator circuit when oscillation begins. In such an oscillator circuit, an oscillation permitting signal (EN) sets an oscillator section in oscillation-operable state, whereby a controller section starts operation. The controller section that has stared its operation change an oscillation- frequency control signal (VR) into a signal value corresponding to predetermined oscillation frequency so as to set oscillation frequency at an oscillator section. Further on, the oscillator section outputs an oscillation signal in response to a detection signal (MON) that is outputted after a detector section compares a signal inputted therein with a predetermined signal value and detects that the inputted signal reaches a predetermined signal value. Thereby, transient state of an oscillation-frequency control signal (VR) can be detected. That is, there can be avoided an output of an unstable oscillation signal due to a transient oscillation-frequency control signal (VR).
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Kawamoto Satoru
Ogawa Yasushige
Arent & Fox LLP
Fujitsu Microelectronics Limited
Mis David
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