| 摘要 |
An analog signal input circuit comprises a plurality of input terminals, an output node, a plurality of p-type first FETs inserted between the input terminals and the output node, and a plurality of n-type second FETs inserted between the input terminals and the output node. The gate terminals of the first FETs are supplied with first control signals, and the substrates thereof are connected to a positive potential power source terminal. The source of one first FET is connected to the drain of another. The gate terminals of the second FETs are supplied with second control signals. The second FETs have parasitic bipolar transistors which function as PN junctions whose conduction directions are opposite with reference to each other. The source of one second FET is connected to the drain of another.
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