Designing a MOSFET Common Source Amplifier with Fixed Biasing Scheme

Jan 16, 2026

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This guide outlines the steps to design a Common Source (CS) amplifier using an IRF840 MOSFET with a fixed biasing scheme. Given a supply voltage (VDD) of 15V, a voltage gain (Av) of -10, and a drain current (ID) of 4mA, follow this structured approach: First, choose a fixed biasing scheme. Next, calculate the required resistor values for RD and RS. Then, find RG1 and RG2 from the MOSFET datasheet. Finally, simulate the design using SPICE and utilize a function generator to determine the amplifier's bandwidth.

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Designing a MOSFET Common Source Amplifier with Fixed Biasing Scheme

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