Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1992-10-28
1994-05-17
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 7641, 328133, 328134, 328141, 377 39, H03D 1300
Patent
active
053131541
ABSTRACT:
The apparatus detects a difference of frequency between a first signal having a first frequency and a second signal having a second frequency, the first and second signals being digital signals. A phase shifter shifts the first signal such that the first signal and the shifted first signal are sufficiently out of phase to keep the rising and falling edges of the two signals from occurring at the same time thereby avoiding subsequent simultaneous triggering conditions and jitter conditions between the first and second signal. A first gate samples the second signal by the shifted first signal to output a first sampled signal. A second gate samples the second signal by the first signal to output a second sampled signal. A sample gate samples the first sampled signal and the second sampled signal to generate a difference signal, the difference signal containing a difference value of the frequency difference between the first and second signal.
REFERENCES:
patent: 4683437 (1987-07-01), Javeri
patent: 4777447 (1988-10-01), Mueller
Champion Ronald C.
Honeywell Inc.
Sapelli Arthur A.
Solis Jose M.
Udseth William
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