| 摘要 |
PURPOSE:To obtain a reference voltage formation circuit having superior temperature characteristics at a low level by connecting a transistor (Tr) to a resistor with a specific relation, negatively feeding back its differential current and extracting the reference voltage. CONSTITUTION:The collector and emitter of a control TrQ7 are connected between an output terminal T1 for extracting the reference voltage and an input terminal T2 to which an input voltage (power supply voltage) is supplied. Resistors R1, R2 and a current detecting TrQ1 are connected in series between the output terminal T1 and the earth and a TrQ5 is connected to said serial connection to form a current mirror circuit 1. In addition, Trs Q3, Q4 constitute a current mirror circuit 2, a TrQ6 is connected as an inversional amplifier and connected to the base of a TrQ7. Consequently, the difference (i2-i1) between the collector currents i2, i1 of the Trs Q2, Q1 flows into the base of the TrQ6, the currents i1, i2 are stabilized at fixed values by the negative feedback function and the reference voltage V stable against the temperature change can be obtained.
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