Patent ID: 7948304

Claim:
A constant-voltage generating circuit comprising: a reference potential generating unit which outputs a prescribed first potential that varies with a positive or negative temperature dependence in accordance with a potential on an output line, and a second potential that varies with an opposite temperature dependence to the positive or negative temperature dependence with respect to the potential on the output line; a first amplifier unit which takes the first potential and the second potential as two inputs, and whose output is connected to the output line during a first operation period; a second amplifier unit which takes the first potential and the second potential as two inputs, and whose output is connected to the output line during a second operation period; and a low-pass filter connected to the output line, and wherein the first operation period and the second operation period are repeated, one alternating with the other, the first amplifier unit stores offset voltage of the first amplifier unit during the second operation period, and produces an output, during the first operation period, that brings the first potential and the second potential equal to each other by canceling out the offset voltage using the stored offset voltage, and the second amplifier unit stores offset voltage of the second amplifier unit during the first operation period, and produces an output, during the second operation period, that brings the first potential and the second potential equal to each other by canceling out the offset voltage using the stored offset voltage.