# CMOS and Pseudo NMOS

Im trying design this function : (NOT Y)=A+BCD in CMOS my design in pic below now i want to design this function in Pseudo NMOS but i dont know how to design it in Pseudo NMOS.anyone can help please??

• It won't work without a pull-up resistor. – Andy aka May 29 '17 at 14:55
• @Andyaka how i add a pull-up resistor? – Memo May 29 '17 at 15:00
• A pull-up resistor is a resistor which will pull up (make high) the output when all transistors which could pull the output down (low) are off. Now think where this resistor must be placed. Hint: one side of the resistor must connect to VDD, the supply voltage (which is invisible in your schematic). – Bimpelrekkie May 29 '17 at 15:19

The name pseudo-NMOS'' originates from the circumstance that in the older NMOS technologies a depletion mode NMOS transistor with its gate connected to source was used as a pull-up device. http://www.iue.tuwien.ac.at/phd/schrom/node101.html