Analog Electronics

BJT DC Analysis

The BJT C$-$coupled amplifier shown in Fig $1$ has the following parameters:

$V_{CC}=15V,R_c=1k,R_E=50,$

$R_1=9\mathrm{.}2k,R_2=60k,R_L=20k,C_1=45nF,C_2=15nF.$

the transistor has a forward current gain $=120\frac{?}{?}$&

$V_{BE}=0\mathrm{.}7V.$

DC Analysis

Calculate the base current.

$(10$ Marks$)$

Calculate the collector current.

$(10$ Marks$)$

AC Analysis

Draw the equivalent small$-$signal model for this circuit.

$(10$ Marks$)$

Find the gain of this amplifier

$(10$ Marks$)$

The input and output resistance of the circuit

$(10$ Marks$)$

Frequency Response:

Calculate the cut$-$off frequency caused by $C1.$

$(10$ Marks$)$

Calculate the cut$-$off frequency caused by C$2.$

$(10$ Marks$)$

Determine the overall low cut$-$off frequency.

$(10$ Marks$)$