I'm learning LTSPICE and am very confused by the results coming from playing around with P-channel MOSFETs.
I created a very complete test of P-channel and N-channel MOSFETs, and all the N-channel results make sense to me, but can someone please explain what's going on with the P-channel?
M1 behaves as a forward biased diode with a voltage drop of about 0.105 V (seems small but believable).
M2, which according to my understanding of P-FETs should behave like a closed circuit, behaves virtually identically to M1.
M3 and M4 are also identical, and the results are:
M4, which is likely the most useful configuration, has a waveform that makes sense, but the numbers don't make any sense. Shouldn't this work as a switch, meaning that the voltage should go between roughly 0 and roughly 20, not 19.898 and 19.895? (R_ds,on = 0.035 ohms) And M3 is the same - is that okay?
Lool I was fighting with a more complicated simulation all day and finally decided to go back to the basics, and now I'm just more confused...