I am looking at using a CMOS totem pole to drive a digital signal. I am aiming to match the output impedance to 50 ohm with a series resistor. My question is how do I determine the impedance added by the CMOS component?
I from reading this link:
https://www.physicsforums.com/threads/how-to-determine-the-output-impedance-of-cmos-gates.433643/
I gather that (1) the output impedance differs between the N-channel and P-channel FET and (2) the impedance can be approximated by (Vcc - Voh)/Ioh. I do not know what Voh and Ioh are... are they values from the data sheet?
The data sheet for the part I am considering is: https://www.fairchildsemi.com/datasheets/FD/FDG6332C.pdf
A follow up question: Is Rds(on) equivalent to the output impedance?
I from reading this link:
https://www.physicsforums.com/threads/how-to-determine-the-output-impedance-of-cmos-gates.433643/
I gather that (1) the output impedance differs between the N-channel and P-channel FET and (2) the impedance can be approximated by (Vcc - Voh)/Ioh. I do not know what Voh and Ioh are... are they values from the data sheet?
The data sheet for the part I am considering is: https://www.fairchildsemi.com/datasheets/FD/FDG6332C.pdf
A follow up question: Is Rds(on) equivalent to the output impedance?