What is this fourth connection in NMOS device?
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NMOS lover | (no comment) | May 12, 2022 at 12:16 |
That fourth connection is the bulk/body/substrate connection: -
Image from here. On a normal 3 terminal MOSFET the "body" is connected to the source. On your device, the 3 n-channel MOSFETs share a common bulk pin that should usually be connected to the most negative voltage of your circuit (quite often 0 volts or GND). $$$$ Internally, the body/bulk connection is shown in the picture below: -
As the gate voltage rises positively with respect to the source, the p type material between drain and source inverts to n type material and forms a conducting channel.
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