Oscillators – Ring oscillators
Reexamination Certificate
2007-02-27
2007-02-27
Kinkead, Arnold (Department: 2817)
Oscillators
Ring oscillators
C331S074000, C331S034000, C331S175000
Reexamination Certificate
active
11006386
ABSTRACT:
An oscillator operates with a variable driving voltage to produce an oscillation signal of a predetermined period in a semiconductor device. The oscillator has a plurality of logic devices connected to each other in a form of a ring. The oscillator includes a voltage generating circuit for generating first and second driving voltages which are selectively applied to the logic devices. The selective application of the first or second driving voltage to the logic devices affects the period of the oscillation signal produced. The first driving voltage is applied to the logic devices for normal operations when the oscillation signal period is tested to substantially equal the predetermined period. The second driving voltage is applied to the logic devices for normal operations when the oscillation signal period is tested to be different from the predetermined period. The second driving voltage is adjusted by changing the resistance ratio of at least two resistors in the circuit.
REFERENCES:
patent: 5406228 (1995-04-01), Hoang
patent: 6462625 (2002-10-01), Kim
patent: 2000 188527 (2000-07-01), None
Hynix / Semiconductor Inc.
Kinkead Arnold
Ladas & Parry LLP
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