DC COMPONENT FILTER Russian patent published in 2003 - IPC

FIELD: electric measurement technology; separating DC component of periodic voltages. SUBSTANCE: newly introduced in filter are differentiator 18 and integrator 17 incorporating operational amplifiers 4 and 8, as well as circuit 11-16 for eliminating integration of bias voltage and input currents of operational amplifier 8 incorporated in integrator 17; this circuit has series-connected differentiating circuits built around capacitor 11, resistor 12, Schmitt flip- flop 13, frequency divider 14, and pulse shaper 15 whose output signal controls bit key 19 of integrator 17. It also has differential amplifier 16 whose inverting input is connected to output of integrator 17 and noninverting one, to signal source 1. EFFECT: enhanced precision of DC component separation. 1 cl, 3 dwg