Analog quadrature signal to phase angle data conversion by a quadrature digitizer and quadrature counter

The quadrature phase angle /phi/(t) of a pair of quadrature signals s1(t) and s2(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 S1=k(t) sin /phi/(t) and S2(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)