11/24/2023 0 Comments Cmos pmos![]() Note that when we want to operate this NMOS as a switch we want a large Vgs. Then source = body and things are simple, Vgs is the same as Vgb (gate-bulk voltage). Usually if you want to use for example an NMOS as a switch to ground you would simply connect the body (bulk or backgate) to ground. ![]() Does this mean that it does not matter if the drain and source terminal are swapped? Does the body potential influence this polarity? I have also heard that transistors in common design processes are symmetric devices. In this case the source terminal is not connected to the lowest potential, should it then be wired to ground or the source terminal? ![]() In my design, some of the switches are placed in between a PMOS sitting at the top and NMOS. I have read that you should tie the body terminal to the source terminal/gnd in the case of NMOS. I also think that I have to ensure that all the switches operate in the ohmic region.īut when it comes to wiring the body terminals I get a little bit confused. All the switches are driven rail-to-rail. The switches are supposed to control a number of capacitors and I want to implement them as single NMOS or PMOS transistors.īased on my understanding I have done the following: Choosing PMOS for switches where the voltage signals switched are closest to VDD and NMOS for switching voltages closer to gnd, to enable optimal drive conditions and this way decrease Rds_on. ![]() I am trying to design a set of switches in a cmos design. ![]()
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