| 摘要 |
PURPOSE:To stabilize a current characteristic against the fluctuation of a load and that of a power source voltage by comprising a circuit utilizing the differ ence between action points of the same conductive type fieled effect transistors. CONSTITUTION:The 2nd FFT32 is operated in the saturated area of a drain current, however the drain current is inclined to change due to the fluctuation of the load 4 and that of the power voltage VDD. At that time the drain voltage of the 1st FET31 changes, which leads the voltage across the gate and source of the 2nd FET to change. The action point of the 2nd FET fluctuates, and a change in the drain current of the 2nd FET is suppressed. With the aid of such an action the action point of the 1st FET31 is set in the saturated area of the drain current, whereby a constant current circuit with a stabler current characteristic can be constituted.
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