OR is parallel-connected because only PMOS 1 OR PMOS 2 need to be conducting to connect the output to a voltage rail to drive it. The changing from NMOS to PMOS automatically takes care of the inverted inputs because that is the nature of PMOS and NMOS, so all you have to do is change the series connections of the NMOS to parallel for the PMOS which is the same as changing AND to OR.ĪND is series-connected because NMOS 1 AND NMOS 2 must be conducting to connect the output to a voltage rail to drive the output. You change ORNOR and invert the inputs to get the compliment. "Compliment" being the arrangement that does the same thing but operates on inverted inputs. Therefore, the PMOS is arranged as the "compliment" of the NMOS. PMOS responsds to the opposite logic levels of the NMOS. CMOS In addition to an n-channel MOSFET device (i.e., NMOS), we can build p-channel MOSFET (i.e., PMOS) device. So the PMOS and NMOS must always be doing the opposite thing. a 120-GHz wideband phase-compensated variable gain amplifier (VGA) with a p-type metal-oxide-semiconductor (PMOS) switch using a 40-nm CMOS process. NMOS's job is to pull LO, PMOS job is to pull HI. true) then Out is not HI, in the sense that both NMOS would be conducting and thus connecting OUT to 0? Do you not understand that if A and B are both HI (i.e.
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