For the circuit in Figure 7.41(a), the parameters are,
(i)
a.
The midband current gain.
Answer to Problem 7.10EP
The value of mid-band current gain
Explanation of Solution
Given:
The parameters for the given circuit:
Drawing the DC equivalent circuit for the given circuit:
Evaluating the Thevenin equivalent voltage at the base terminal:
Evaluating the Thevenin equivalent resistance at the base terminal:
Drawing the DC equivalent circuit as shown below:
Evaluating the value of base current
Evaluating the value of collector current
Evaluating the value of small signal parameters
Evaluating the value of small signal parameters
Drawing the small-signal equivalent circuit for the mid band current gain:
Applying the nodal analysis at the node
Applying the current division rule at the output node:
Evaluating the value of mid band current gain
Hence, the value of mid-band current gain
b.
The Miller capacitance CM for the given values of the
Answer to Problem 7.10EP
The Miller capacitances for the both cases are:
Explanation of Solution
Given:
The parameters for the given circuit:
The value of the capacitances are given as:
( i ) The value of capacitance
Evaluating the value of Miller capacitance for
Hence, the value of Miller capacitance for
(ii)
The value of capacitance:
Evaluating the value of Miller capacitance for
Hence, the value of the Miller capacitance for
c.
The upper 3-dB frequency for the given values of the
Answer to Problem 7.10EP
The 3-dB frequencies for the both cases are:
Explanation of Solution
Given:
The parameters for the given circuit:
The value of the capacitances are given as:
(i)
The value of Miller capacitance for
Since,
Evaluating the upper
Hence, the upper
(ii)
The value of Miller capacitance for
Since,
Evaluating the upper
Hence, the upper
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Chapter 7 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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