ANALOG OPERATIONAL AMPLIFIER CIRCUIT

摘要

PROBLEM TO BE SOLVED: To prevent the generation of any error in an analog operational amplifier circuit itself by preventing the generation of any error in the values of an input resistance RA and a feedback resistance RB due to environmental changes or inter-part individual difference or the like and by preventing the generation of any deviation because of the inequality of input offset voltage Vid and reference voltage Vref due to the generation of voltage fluctuation in the input offset voltage Vid or reference voltage Vref itself. SOLUTION: This analog operational amplifier circuit is provided with an operational amplifier, an inversion amplifier having an input terminal connected to the inversion input terminal of the operational amplifier and an output terminal negative feedback-connected with the inversion input terminal, and a filter circuit arranged between the input terminal of the inversion amplifier and the non-inversion input terminal of the operational amplifier for removing the AC signal components of an input signal inputted from the input terminal and for outputting it to the non-inversion input terminal.