| 摘要 |
A CMOS reference voltage circuit, preferably formed on a semiconductor integrated circuit, and outputting a reference voltage having a temperature-independent characteristic, comprises first and second diode-connected transistors (or diodes), respectively grounded and driven with two constant currents bearing a constant current ratio to each other, and a unit for amplifying a differential voltage of output voltages from the first and second transistors by a preset factor and for summing the amplified differential voltage to an output voltage of the first or second transistor. The amplifying and summing unit is formed by two OTAs 11, 12 and a current mirror circuit 13. The first OTA 11 is fed with the differential voltage and the second OTA 12 has a reverse phase input terminal fed with an output voltage from the first or second transistor and a forward phase input terminal connected to its output terminal and driven with a current proportional to an output current of the first OTA 11, with an output terminal voltage of the second OTA 12 being used as an output voltage.
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