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Question 18.10: If rds varies from 50 Ω to 120 kΩ in Fig. 18-32, what is the...

If r_{ds} varies from 50 Ω to 120 kΩ in Fig. 18-32, what is the maximum voltage gain? What is the minimum voltage gain?

18-32
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Using the values and equations of Fig. 18-32, the maximum voltage gain is:

A_V=\left(\frac{47 \ k\Omega }{1 \ k\Omega }+1 \right)\frac{120 \ k\Omega }{120 \ kΩ + 100 \ kΩ}= 26.2

The minimum voltage gain is:

A_V=\left(\frac{47 \ k\Omega }{1 \ k\Omega }+1 \right)\frac{50 \ \Omega }{50 \ Ω + 100 \ kΩ}= 0.024

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