Answer to Question 4

Back

Without an op-amp, both have crossover distortion.
 
The voltage gap with bipolar transistors is 1.4 V.
 
The voltage gap with MOSFETs is 5 V.
 
This is overcome with an op-amp as a voltage follower.
 
Voltage gain in both cases is 1.
 
Power gain is very high for both types.