The BiCMOS circuit shown in Figure P11.82 is equivalent to a pnp bipolar transistor with an infinite input impedance. The bias current is
(a)
To sketch: The small-signal equivalent circuit of the given BiCMOS circuit.
Answer to Problem 11.82P
The required sketch is shown in Figure 3.
Explanation of Solution
Given:
The given diagram is shown below.
Calculation:
Mark the value and redraw the circuit.
The required diagram is shown in Figure 1
Figure 1
The small signal equivalent circuit is shown in Figure 2
Figure 2
Conclusion:
Therefore, the required sketch is shown in Figure 2
(b)
The small signal parameters for each of the transistor.
Answer to Problem 11.82P
The value of small signal parameters are
Explanation of Solution
iven:
The given diagram is shown below.
Calculation:
The value of the current through the resistance
The expression for the resistance
Substitute
The value of the drain current is calculated as,
The expression for the collector current is given by,
Substitute
The value of the base current is calculated as,
The transconductance of the first transistor is given by,
Substitute
The transconductance of the first transistor is given by,
Substitute
The value of the resistance
Conclusion:
Therefore, the value of small signal parameters are
(c)
The value of small signal voltage gain for the given values of load resistor.
Answer to Problem 11.82P
The value of the small signal voltage gain for
Explanation of Solution
Given:
The given diagram is shown below.
The given values of load resistor is
Calculation:
The expression for the voltage
The expression for the gate to source voltage is given by,
The expression to determine the value of the output voltage is given by,
Substitute
Substitute
Conclusion:
Therefore, the value of the small signal voltage gain for
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Chapter 11 Solutions
MICROELECT. CIRCUIT ANALYSIS&DESIGN (LL)
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