MEASURING OPERATIONAL AMPLIFIER Russian patent published in 1996 - IPC

FIELD: radio engineering. SUBSTANCE: amplifier has first, second, and third operational amplifiers as well as first and second current mirrors. Noninverter inputs of first and second operational amplifiers function as inputs of measuring operational amplifier. Inputs of first and second current mirrors are connected, respectively, to positive and negative terminals of first operational amplifier power circuit and their terminal leads are interconnected. Power leads of current mirrors are connected, respectively, to positive- and negative-voltage buses. Inverting input of first operational amplifier is connected through first resistor to inverting input and output of second operational amplifier. Output of third operational amplifier functions as output of measuring operational amplifier and is connected to inverting input of third operational amplifier whose inverting input is connected via second resistor to common bus. Interconnected outputs of first and second current mirrors are connected to inverting input of first operational amplifier whose output is connected to inverting input of third operational amplifier. EFFECT: reduced nonlinear distortions of amplified signal. 1 dwg