| 摘要 |
Voltage control means output to a variable resistance part 2 a control voltage proportionate to an error between an input detection signal of an input terminal Ti of a source follower field-effect transistor 1 and an output detection signal of an output-side transistor 5. Although said variable resistance part 2 changes its resistance value in accordance with a control voltage, a drain current flowing from the field-effect transistor to said variable resistance part is maintained constant by a constant-current source 3. Thus, an output voltage of the output side transistor changes in accordance with said error, thereby controlling the input detection voltage and the output detection voltage to be constantly the same.
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