Patent ID: 7907136
Filing Date: 2011-03-15
Classification: H03F,H03K

Abstract:
1. A voltage generation circuit comprising: a voltage divider circuit that generates first to Mth (M is an integer of two or more) divided voltages using a first power supply that supplies a first power supply voltage and a second power supply that supplies a second power supply voltage lower than the first power supply voltage, and outputs the generated first to Mth divided voltages; and first to Mth impedance conversion circuits that perform impedance conversion of the first to Mth divided voltages, each of the first to Pth (1<P<M, P is an integer) impedance conversion circuits and the Qth (P<Q<M, Q is an integer) to Mth impedance conversion circuits including an operational amplifier of a first type, that is a rail-to-rail type, of which an operational range is set in a range between the first power supply voltage and the second power supply voltage, and each of the (P+1)th to (Q−1)th impedance conversion circuits including an operational amplifier of a second type of which an operational range is set in a range between a third voltage that is lower than the first power supply voltage and a fourth voltage that is lower than the first power supply voltage and higher than the second power supply voltage,