Analog quadrature signal to phase angle data conversion by a qua

Details Analog quadrature signal to phase angle data conversion by a qua Analog quadrature signal to phase angle data conversion by a qua

1981-09-23

1984-01-17

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

307511, 328155, 324 83Q, G01R 2500

Patent

active

044266200

ABSTRACT:
The quadrature phase angle .phi.(t) of a pair of quadrature signals S.sub.1 (t) and S.sub.2 (t) is digitally encoded on a real time basis by a quadrature digitizer for fractional .phi.(t) rotational excursions and by a quadrature up/down counter for full .phi.(t) rotations. The pair of quadrature signals are of the form S.sub.1 (t)=k(t) sin .phi.(t) and S.sub.2 (t)=k(t) cos .phi.(t) where k(t) is a signal common to both. The quadrature digitizer and the quadrature up/down counter may be used together or singularly as desired or required. Optionally, a digital-to-analog converter may follow the outputs of the quadrature digitizer and the quadrature up/down counter to provide an analog signal output of the quadrature phase angle .phi.(t).

REFERENCES:
patent: 2994790 (1961-08-01), Delaney
patent: 3391343 (1968-07-01), McCurdy
patent: 3849671 (1974-11-01), Molack
patent: 3953794 (1976-04-01), Moore

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