| 摘要 |
PURPOSE:To provide the CMOS analog switch which is stably operated regardless of a low supply voltage by specifying the circuit constitution of analog switch consisting of NMOSFETs. CONSTITUTION:The drain D of a first NMOSFET 5 is connected to an analog signal input terminal 1, and the gate G is connected to a first control signal input terminal 3. The source S and the back gate B are connected to the source S and the back gate B of a second NMOSFET 6 in common. The drain D of the second NMOSFET 6 is connected to an analog signal output terminal 2, and the gate G is connected to the first control signal input terminal 3. The source S of a PMOSFET 7 is connected to the analog signal input terminal 1, and the gate G is connected to a second control signal input terminal 4, and the drain D is connected to the analog signal output terminal 2. Since the back gate bias effect is not brought about, the on-state resistance of the switch is not increased much even in the case of a small difference between maximum and minimum potentials. |
