# Understanding PMOS's and NMOS's

The problem says solve assuming VI = 0, +2.5V, and -2.5V. I know that if VI = -2.5V the MOSFET's are in cutoff and that VDS = 0. and IDP and IDN will = 0, but would V0 also = 0?

If VI = 0 the circuit is not in cutoff, and I'm assuming it is in triode region, but I'm not sure. I'm also assuming if VI = 2.5 the circuit is in saturation region, but again, not sure how to verify this without knowing V0 to start with.

Any help with this problem would be much appreciated.

• I know that if VI = -2.5V the MOSFET's are in cutoff Think again. Are both MOSFETs off, or is only one of then off? What is the $V_{gs}$ of the NMOS and the PMOS when $V_i$ = -2.5 V? Do NMOS and PMOS have the same $V_{gs}$? – Bimpelrekkie Apr 22 at 13:10
• figured it out. Thanks! – Amanda Graves Apr 23 at 9:36