Frequency stability measuring apparatus

Details Frequency stability measuring apparatus Frequency stability measuring apparatus

2006-08-23

2008-09-30

Pascal, Robert J. (Department: 2817)

Oscillators

With frequency calibration or testing

C331S074000, C324S076410, C324S076440

Reexamination Certificate

active

07429896

ABSTRACT:
A frequency stability measuring apparatus for measuring a frequency fluctuation of a signal outputted from a given signal source includes: a reference signal output unit that outputs a reference frequency signal; a mixer that mixes a signal outputted from the signal source with the reference frequency signal outputted from the reference signal output unit and outputs a resultant signal; a filter that allows a low-frequency component of the signal outputted from the mixer to pass therethrough; a waveform-shaping circuit that shapes a waveform of a signal outputted from the filter; a counter that counts a number of pulses of a signal shaped by the waveform-shaping circuit; and a control unit that calculates average frequencies of the signal outputted from the filter within respective measurement periods of a predetermined length, and calculates and outputs a standard deviation of the average frequencies calculated

REFERENCES:
patent: 3838338 (1974-09-01), Khoury
patent: 4063169 (1977-12-01), Palmer
patent: 4651089 (1987-03-01), Haigh
patent: 62-110166 (1987-05-01), None
patent: 2001-045595 (2001-02-01), None
patent: 2002-243778 (2002-08-01), None

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