Design a bipolar cascode amplifier with a cascode active load similar tothat in Figure P10.89 except the amplifying transistors are to be pnp andthe load transistors are to be npn. Bias the circuit at
The design of a circuit for a given specifications.
To find: The small-signal voltage gain
Answer to Problem D10.90P
The design is shown in Figure 2.
Explanation of Solution
Given:
Calculation:
The given circuit is,
Figure 1
The equivalent designed circuit for active load amplifier is as shown,
Figure 2
The expression for input voltage
Now expression for output resistance is,
Put equation (3) in equation (2).
Consider
Now expression for hybrid resistor parameter.
Now output voltage will be,
Consider
Put value from equation (8) to equation (6).
Put
Now
Substitute the value for
Now
Substitute the derived values in equation (10).
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Chapter 10 Solutions
Microelectronics: Circuit Analysis and Design
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