D 10.19 Design a CS amplifier for which the MOSFET is operated at gm = 5 mA/V and has Cg, = 5 pF and Cgd = 1 pF. The amplifier is fed with a signal source having R = 1 kq. What is the largest value of R, for which the upper 3-dB frequency is at least 6 MHz? What is the corresponding value of midband gain and gain-bandwidth product? If the specification on the upper 3-dB frequency can be relaxed by a factor of 3, that is, to 2 MHz, what can Ay and GB become?

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Multistage Amplifier

The multistage amplifier is generally a voltage or power amplifier. The multistage amplifier has a number of single stage amplifier that are cascaded together. Since a single stage amplifier output is not useful, they are being replaced with multistage amplifiers or multistage transistor amplifiers. The multistage amplifier are used where the gain required is high or the input signal is very small such that only a single stage amplifier cannot amplify it.