Unformatted text preview: on is
reverse biased (i.e.,
).
iii) Find the small signal parameters of the BJT under this bias condition. [4 pts]
1
26 38.5 mS 2.6 kΩ
10 kΩ Page 7 iv) What is the expression for the voltage gain? What is its numerical value? [6 pts] For this part, assume ∞ (given during exam).
9.65 1 1 You could also write the gain as the gain from the input to the base times the gain from
the base to the collector, which would look like:
1
1 1 9.65 v) What is the expression for the input impedance (seen by vin )? What is its numerical value?
[6 pts] For this part, assume ∞ (given during exam).
1 Page 8 104.6 kΩ vi) What is the expression for the output impedance (seen by vout )? What is its numerical
value? [6 pts] For this circuit, we must perform smallsignal analysis to determine the output resistance.
The derivation is similar to the derivation of the output impedance of a common emitter
amplifier with emitter degeneration.
Here’s the smallsignal model with a test source at the output (excluding
obviously goes in parallel with the result from this analysis): , which 1 1 1 1
1 Page 9 9.58 kΩ...
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 Spring '07
 KingLiu
 Electrical Engineering, Bipolar junction transistor, cm /V

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