Concept explainers
The overall small-signal voltage gain of the amplifier.
Answer to Problem 13.21P
The overall small-signal voltage gain of the amplifier is
Explanation of Solution
Given:
Consider the 741 op-amp having bias voltage ±5 V
Calculation:
The early voltage given as
The reference current is
Current
The bias currents in the input stage are,
The voltage at the collector of
The collector current in
Now, current
Assuming
The current in
The input resistance to the gain stage is found as
Therefore, the emitter resistor
Also,
Consequently, the resistor value
Now the resistance of the active load is determined as
And
Then,
Now the resistance
The small signal differential voltage is
The effective resistance of the active load is the resistance looking into the collector of
And the output resistance
The small signal voltage gain is
The overall gain is
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Chapter 13 Solutions
Microelectronics: Circuit Analysis and Design
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