Anti-aliasing for frequency output sensors

Details Anti-aliasing for frequency output sensors Anti-aliasing for frequency output sensors

1990-06-11

1992-03-10

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324166, 32420715, 377 19, 73518, G01P 352

Patent

active

050952633

ABSTRACT:
A technique for reducing the effects of aliasing in a frequency output sensor system. The system includes a sensor for producing a sensor output signal at a frequency that varies within a modulation range as a function of an input parameter. The system also includes a processor for measuring the frequency of the sensor output signal at a sequence of sample times. The invention provides an analog filter for filtering the sensor output signal. In a first embodiment, the filter has an increasing phase lag versus frequency characteristic within the modulation range. In a second embodiment, the filter comprises a phase lock loop having frequency dividers in the input signal path and in the feedback path.

REFERENCES:
patent: 4199719 (1980-04-01), Grob
patent: 4262251 (1981-04-01), Fujishiro
patent: 4331917 (1982-05-01), Render
patent: 4341996 (1987-07-01), Coffman
patent: 4383303 (1983-05-01), Hoffman
patent: 4647853 (1987-03-01), Cobern

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