Frequency measurement using phase continuous frequency switching

Details Frequency measurement using phase continuous frequency switching Frequency measurement using phase continuous frequency switching

1975-02-05

1976-10-05

Rolinec, R. V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

324 83D, 328140, 23515131, G01R 2300

Patent

active

039847705

ABSTRACT:
An automatic transfer oscillator system for frequency measurement using a single sampler is described. Two signals, of frequencies f.sub.1 and f.sub.2, are alternately used to drive the sampler. The two frequencies are sufficiently close by design so that the intermediate frequency signals generated arise from the same harmonic number when sampling a signal of unknown frequency f.sub.x. The resulting average IF output is accurately measured and used to compute the unknown frequency f.sub.x. Accurate measurement of the average IF output is made possible because the transition between f.sub.1 driving the sampler and f.sub.2 driving the sampler only occurs when the two signals are in phase. As a result, the IF signal transitions are also in phase and spurious signals are not produced. This technique is referred to as phase continuous switching.

REFERENCES:
patent: 3391343 (1968-07-01), McCurdy

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