| 摘要 |
PURPOSE: To obtain a highly precise reference voltage operating stably even by a low power supply voltage in a semiconductor integrated circuit. CONSTITUTION: A reference voltage circuit consists of a constant current circuit by an n-channel depletion type MOS transistor 120 whose source and gate are grounded, a source grounding amplification circuit by an n-channel enhancement type MOS transistor 110 for outputting a reference voltage Vref, an n-channel enhancement type MOS transistor 111 in which the reference voltage Vref is connected with a gate, and a current mirror circuit composed of p-channel enhancement type MOS transistors 100, 101, and 102 for current-mirroring a current outputted from the transistor 111.
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