Oscillators – Relaxation oscillators
Reexamination Certificate
2006-06-06
2008-05-20
Pascal, Robert J. (Department: 2817)
Oscillators
Relaxation oscillators
C331S111000, C331S074000, C327S120000, C327S122000
Reexamination Certificate
active
07375599
ABSTRACT:
A signal generating circuit includes a relaxation oscillator operating to alternately generate a first ramp signal that is periodic at a frequency of the relaxation oscillator and a second ramp signal that is periodic at the frequency of the relaxation oscillator and is out of phase with respect to the first ramp signal The first ramp signal is compared to a first reference voltage and the state of a first flip-flop is changed if the first ramp signal exceeds the first reference voltage. The second ramp signal is compared to the first reference voltage and the state of a second flip-flop is changed if the second ramp signal exceeds the first reference voltage. The first flip-flop is reset in response to a first level of the first ramp signal and the second flip-flop is reset in response to a second level of the second ramp signal. A logical ORing function is performed on an output of the first flip-flop and an output of the second flip-flop to produce an output signal having a frequency that is a multiple of the relaxation oscillator frequency.
REFERENCES:
patent: 5180994 (1993-01-01), Martin et al.
Brady III Wade J.
Goodley James
Pascal Robert J.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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