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Voltage amplifier stages having the characteristics show in the following table are available. The signal source has an open-circuit voltage of 20mV rms and an internal resistance of 2MΩ. The load is a 20Ω resistance. Design a cascade amplifier using smallest number of stages that provides at least 1 W to the load. What are the values of the input resistance, the output resistance and the open-circuit voltage gain of your amplifier?
Amplifier stage type
Open circuit Voltage gain
Input Resistance
Output Resistance
A
1
10 MΩ
1 kΩ
B
5
1 Ω
C
10
20 kΩ
100 Ω
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