Voltage Gain in Midband Region of Transistor Amplifier

[swty todd]

In the midband region the voltage is constant and is assumed to be unity and the transistor amplifier is always used in this region. Doesn’t that mean that there is no voltage gain??

 

[berkeman]

In the midband region the voltage is constant and is assumed to be unity and the transistor amplifier is always used in this region. Doesn’t that mean that there is no voltage gain??

What is the source of this quote? What topology transistor amplifier is it referring to?