# D 10.19 Design a CS amplifier for which the MOSFET is operated at gm = 5 mA/V and has Cgs = 5 pF and Cgd = 1 pF. The amplifier is fed with a signal source having Rsig = 1 kΩ. What is the largest value of 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 AM and GB become?

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