Example: Calculating the Small-Signal Gain
Example: Calculating the Small-Signal Gain
For this circuit, we have now determined (if BJT is in active mode), the small-signal equations are:
Q: So, can we now determine the small-signal open-circuit voltage gain of this amplifier? I.E.:
[pic]
A: Look at the four small-signal equations—there are four unknowns (i.e.,[pic])!
Combining equations 2) and 4), we get:
[pic]
Inserting this result in equation 1), we find:
[pic]
Therefore:
[pic]
and since [pic]:
[pic]
which we insert into equation 3):
[pic]
Therefore, the small-signal gain of this amplifier is:
[pic]
Note this is the small signal gain of this amplifier—and this amplifier only!
-----------------------
RC
[pic]
RB
VCC
[pic]
[pic]
[pic]
[pic]
[pic]
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