| 摘要 |
PURPOSE:To attain offset compensation without increasing number of elements and also a high gain by constituting the titled circuit with the connection of the 1st-4th switches, a constant voltage terminal and the 1st and 2nd capacitors among terminals of the 1st and 2nd differential input type amplifiers provided with non-inverting and inverting input terminals. CONSTITUTION:Since the inverting and non-inverting inputs of the differential input amplifier A3 are connected to an earth terminal (common terminal) when switches S4, S5 and S6 are closed, output offset voltages DELTAv01 and DELTAv02 of the differential input type amplifier A3 are generated respectively on an inverting output line L4 and a non-inverting output line L5, the voltages are impressed to one terminal of capacitors C3, C4 respectively, where the output offset voltages are stored. Moreover, since the differential input type amplifier A4 is of the voltage follower circuit constitution and its non-inverting input is connected to the earth terminal, an input offset voltage DELTAv03 is generated on an inverting input line L6 of the differential input type amplifier A4. The voltage is impressed to the other terminal of the capacitor C4, where the input offset voltage of the differential type input amplifier A4 is stored.
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