| 摘要 |
PURPOSE:To compensate the variance of the output voltage against the production variance of a resistance by constituting a generating circuit for reference voltage after the resistance value ratio of each resistance is set at a prescribed level. CONSTITUTION:A generating circuit for reference voltage consists of a constant current circuit part and a reference voltage generating part.. The constant current circuit part includes a resistance connected to a power supply VEE at the low potential side through an end and a transistor TR connected to the other end of the resistance. While the base of the TR is connected to a constant voltage source for extraction of a constant current. Then the reference voltage generating part includes a parallel connection matter of a series matter of a diode D connected to a power supply VCC at the high potential side and the 2nd resistance RS and another series matter of the 3rd and 4th resistances R1 and R2. Here the resistance of the constant current circuit part contains a parallel connection matter of the 5th resistance R4 produced by the same manufacturing process as the resistance RS and the 6th resistance R5 produced by the same manufacturing process as the 2nd and 3rd resistances R1 and R2. Thus each resistance value ratio can be set at a prescribed level. Then the variance of the output voltage VR can be compensated against the production variance.
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