Question

1. The following circuit shows a discrete common source MOSFET amplifier. The MOSFTE is n-channel MOSFET and early voltage (Va) is c. The transconductance of the amplifier (ga) is 3 mA/V The frequency responses of the amplifier are as follows i) The three low break frequencies f 3Hz (caused by C).fiz-S0Hz (caused by Cs). fs-10Hz (caused by Ca) ii) High 3 dB frequency. f-30kHz ii) The MOSFET unity gain frequency fr-100 MHz (a) Draw small signal equivalent circuit of the amplifier in low frequency band and derive transfer function. Ti(s). Find mid-band gain (As) and values of Cci. Ccz and Cs from the transfer function (25 pts) (b) Draw small signal equivalent circuit of the amplifier in high frequency band and derive transfer function, Tis). Find values of Cp and Ct from the transfer function. (You may use Millers theorem, (c) Discuss about gain-bandwidth product.: (25 pts) (10 pts) VDO CC2 o vout Rsig CC1 500k Vsig RG T Cs vss
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Answer #1

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