Help with CMOS Circuit Truth Table

[majestrooo]

Hope this is the right place for this thread.

Homework Statement

Hi I need help with the truth table for a CMOS circuit.

http://www.isk.kth.se/~william/dd/agda/bild/cmos/mos903.gif

Homework Equations

Truth table and

What type of circuit is this? But I guess that's easy to
answer after setting up the truth table. Right now, I'm not even sure
if the values for P1,p2,n1,n2 are correct.

The Attempt at a Solution

Is this correct?

IN
0 0 -> On: P1,P2, Off: N1,N2 OUT: ?
0 1 -> On: N1,P2, Off: P1, N2 OUT: ?
1 0 -> On: P1,N2, Off: N1,P2 OUT: ?
1 1 -> On: N1,N2, Off: P1,P2 OUT: ?

 

[MATLABdude]

I believe you're on the right track. Assuming correct biasing, application of a '1' to the gate of a NMOS will turn it on, and pull drain to ground (assuming source is at ground), while application of a '0' to the gate of a PMOS will turn it on, and pull the drain to VDD.

The simplification here is that the output is in a push-pull configuration with PMOS and NMOS gates tied together (so it'll just invert whatever is at their shared gate).

The (slight) complication is that the source terminals of P1 and P2 are not both connected to VDD, nor are their drain terminals both connected to the push-pull CMOSs. But just remember what the source-drain impedance of a cut-off MOSFET is.

Hope this helps, and good luck!

 

[piercas]

Hello, thank you for reaching out for help with your CMOS circuit truth table. This is indeed the right place for your question.

To begin, let's clarify what type of circuit this is. Based on the diagram provided, it appears to be a basic CMOS inverter circuit. This type of circuit is commonly used in digital logic applications and is used to convert a logic level input (0 or 1) to the opposite logic level output.

Moving on to the truth table, the values for P1, P2, N1, and N2 appear to be correct. However, the values for the output column are missing. To complete the truth table, you will need to determine the output logic level (0 or 1) for each input combination. This can be done by analyzing the behavior of the circuit.

In a CMOS inverter, when both inputs (P and N) are 0, the output will be high (1). When both inputs are 1, the output will be low (0). And when one input is 0 and the other is 1, the output will remain in its current state (either 0 or 1). You can use this information to fill in the output column for each input combination.

I hope this helps you complete your truth table. If you have any further questions or need clarification, please don't hesitate to ask. Best of luck with your circuit!