| 摘要 |
PURPOSE:To suppress the effect of dispersion in characteristics of an element by inputting the output from a reference voltage circuit into at least one input transistor, and inputting a specified potential into the other input transistor. CONSTITUTION:One output of a reference voltage circuit 1 is connected to the base of a transistor Q2 of a voltage comparing circuit 2 and a resistor R2. The emitter of the transistor Q2 is connected to the emitter of a transistor Q4 and one end of a constant-current source Ir1. The sizes of the emitters of the transistors Q2 and Q4 are made to be m:n. Then the difference DELTAVBE between a voltage VBE2 between the base and the emitter of the transistor Q2 and a voltage VBE4 between the base and the emitter of the transistor Q4 is obtained by the expression. In this expression, K is a Boltzmann's constant, (q) is the charge of electrons, Is1 is the saturation current of a transistor Q1 in the reverse direction, Is2 is the saturation current of the transistor Q2 in the reverse direction and T is absolute temperature. |
