Oscillator, frequency multiplier, and test apparatus

Details Oscillator, frequency multiplier, and test apparatus Oscillator, frequency multiplier, and test apparatus

2008-01-22

2008-01-22

Chang, Joseph (Department: 2817)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Phase shift by less than period of input

C331S045000

Reexamination Certificate

active

11441796

ABSTRACT:
There is provided an oscillator for generating an oscillating signal having desired frequency, having a reference oscillating section for generating a reference signal having predetermined frequency, a plurality of first variable delay circuits, connected in cascade, for receiving the reference signal and outputting the received reference signal by sequentially delaying by almost equal values of delay, a phase comparing section for comparing phase of the reference signal generated by the reference oscillating section with phase of a delay signal outputted out of a final stage of the plurality of first variable delay circuits, a delay control section for controlling a value of delay of the plurality of first variable delay circuits so that the phase of the reference signal becomes almost equal to the phase of the delay signal outputted out of the final stage of the plurality of first variable delay circuits and a frequency adding circuit for generating the oscillating signal in which edges of the respective input signals are combined by logically operating the input signals inputted to the respective first variable delay circuits.

REFERENCES:
patent: 6570425 (2003-05-01), Yamaguchi
patent: 6970047 (2005-11-01), Johnson et al.
patent: 2003/0137333 (2003-07-01), Kozaki
patent: 5-273308 (1993-10-01), None
patent: 11-52029 (1999-02-01), None
patent: 11-163689 (1999-06-01), None
International Search Report issued for International application No. PCT/JP2004/017554 mailed on Mar. 1, 2005 and English translation thereof, 4 pages.

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