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For the common base circuit shown, the transistor has parameters β = 120 and VA = ∞
(i) Determine the quiescent VCEQ
(ii) Determine the small signal voltage gain and output resistance.
1 Answer
written 3.0 years ago by |
Performing DC analysis by open circuiting all capacitors
We know that, $I_C\approx I_E$
$\therefore I_C=1\ mA$
Applying KVL to Base - Collector Loop
$V_C=V_{CC}-I_CR_C$
$V_C=5-1\times10^{-3}\times2\times10^3$
$\therefore V_C=3\ V$
$V_{BE}=V_B-V_E$
But, $V_B=0$ and $V_{BE}=0.7$
$\therefore V_E=-0.7\ V$
$V_{CEQ}=V_C-V_E$
$V_{CEQ}=3-(-0.7)$
$\therefore \underline{\underline{V_{CEQ}=3.7\ V}}$
Replacing the BJT by it's small signal equivalent model …