Continuous switched-capacitor dual slope watthour meter...

Details Continuous switched-capacitor dual slope watthour meter... Continuous switched-capacitor dual slope watthour meter...

G - Physics

01

R

324/70

G01R 21/133 (2006.01)

Patent

CA 1283453

A CONTINUOUS SWITCHED-CAPACITOR DUAL SLOPE WATTHOUR METER CIRCUIT WITH CHARGE INJECTION OFFSET COMPENSATION Abstract of the Disclosure Transient offset error voltages due to charge injection by MOS analog switches in switched-capacitor integrators of electronic metering circuits are compensated by use of a continuous switched input capacitor network on the inverting input of the integrator amplifier. Any residual charge injection not cancelled by the switched capacitor network is compensated by employing another switched capacitor network on the non-inverting input of the amplifier and by matching the geometries of the switches in the two networks so that the charge injected into each input of the amplifier is the same.

561098

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