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Designing a MOSFET Common Source Amplifier with Fixed Biasing Scheme

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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Presentation Transcript

  1. LAB 05 MOSFET CS Amplifier

  2. 1. Choose a bias scheme

  3. Example : design a Common source amplifier VDD=15V, Av=-10, ID=4mA, MOSFET=IRF840 Step1: choose Fixed Biasing scheme. Step2: find RD and RS

  4. Step3: find RG1 and RG2 From Datasheet Step4: simulate by Spice

  5. Step4: simulate by Spice

  6. Step5: Using the sweep function of function generator to find the Bandwidth of this CS amplifier.

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