output resistance cmos
The output resistance of CMOS...
low
CMOS uses a complimentary pair. Either the one or the other is on at any one time (assuming not in transition). Thevnin says short V to ground. Therefore, you have a low resistance (an on mosfet) to ground. And, it makes sense to some extent, as CMOS drives many CMOS gates. You don't drive much from a high impedance, except much much higher impedances. (One CMOS can drive many (parallel! -- Rp<lowest R ) CMOS gates -- it has to be low Zout.)
Sorry, I avoid actual numbers as much as possible. ...and hope the circuit doesn't blow up!