Environmental Engineering Reference
In-Depth Information
By remembering that the value of is finite only for the bipolar
transistor we can set to zero. Using (2.27) and the relation
after some manipulation we get
As expected, the voltage gain is close to one. In particular, in bipolar
technology the inaccuracy is due to the ratio between the bias resistance
and resistance
Indeed, relationship (2.28a) becomes
On the other hand, in MOS implementations the loss is due to the bulk
transconductance as shown below
The total voltage gain of the common Z amplifier including input and
output loss is equal to
