Replica circuit

Details Replica circuit Replica circuit

H - Electricity

03

F

324/67

H03F 1/34 (2006.01) G01R 1/28 (2006.01) G01R 15/00 (2006.01) G01R 19/00 (2006.01) H03F 3/347 (2006.01)

Patent

CA 1235748

- 1 - Abstract of the Disclosure A circuit is provided for obtaining an accurate replica of an active electrical parameter, i.e. a voltage or a current. The circuit is an improvement over prior circuits in respect of accuracy, both in relation to magnitude and phase. When providing a voltage replica, the principal utility is to provide a scaled-down replica of a high voltage that can be used for accurate measurements of power. In its applic- ability to current, the principal utility is to provide an accurate scaled-up current reference source, preferably in quadrature to the input current, for use in calibration of reactive volt-ampere or volt-ampere-hour meters. The objective of improved accuracy is achieved by combining known scaling-up and scaling down circuits with a current comparator.

490111

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