[SOLVED] Question about implementing logic function in CMOS logic

[GuiRitter]

Hi everyone.

As per a college assignment, I was supposed to implement, in CMOS logic, the function

(a NAND b) NAND (a OR b)

. According to what I learned, I should transform this, using De Morgan, into

(a NAND b) NAND (a' NAND b')

. However, in CMOS logic this becomes a 4 input NAND (4 input AND in the NMOS part), and the NAND of two NANDs is not equal to a 4 input NAND (and I tested it). So, how should I implement this in CMOS logic?

EDIT: Solved it. Actually, I was doing it wrong. Truth is, we weren't told how to do this in much detail. What I should have done is negate the function, then use De Morgan to remove the NANDs and NORs instead of inserting them. So the function to be implemented in CMOS is

(a' OR b') AND (a OR b)

.

Thanks anyway.