Active quadrature current reference source

Details Active quadrature current reference source Active quadrature current reference source

G - Physics

01

R

328/166

G01R 35/00 (2006.01) G01R 25/00 (2006.01) G05F 1/00 (2006.01) G05F 1/38 (2006.01)

Patent

CA 1143442

TITLE ACTIVE QUADRATURE CURRENT REFERENCE SOURCE INVENTORS William J.M. Moore Norbert L. Kusters Eddy So ABSTRACT OF THE DISCLOSURE This reference source provides a current which is of relatively high magnitude and which leads the voltage by substantially 90°. It includes a reference capacitor which is highly stable and pure but of low capacitance, and a power capacitor which has a high capaci- tance. The capacitors are connected together at one end for coupling to a voltage source. A current comparator compares the currents flowing through the reference capacitor and the power capacitor, and provides a difference signal. A circuit generates a current in response to the difference signal and adds the generated current to the current through the power capacitor resulting in a current having a waveform and phase substantially identical to the reference capacitor current which leads the voltage source voltage by substantially 90°.

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