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Common Gate Amplifier

Introduction of Field Effect Transistors Distinction between a BJT and FET Junction Field Effect Transistor (JFET) N Channel JFET Summary of JFET Operation Mutual or Transfer Characteristic of n-channel JFET Amplification Factor 𝝁 Definition of Parameters p-Channel JFET

Introduction of Metal Oxide Semiconductor Field Effect Transistor - Mosfet Terminals in MOSFET Physical structure of MOSFET MOSFET Working Operation Summary of Operation MOSFET - N Type MOSFET Operation How does Drain current flow MOSFET operation More about Threshold Voltage Current vs Voltage Characteristics - Derivation Non Ideal Current -Voltage Effects or Second Order Effects Short Channel Effects MOSFET Device Capacitances MOSFET Large and Small signal Model pMOSFET Small SIgnal Model To use MOSFET device as a Capacitor nMOSFET as Capacitor- Working

Single Stage Amplifiers Common Source CS Stage with Diode-Connected Load Circuit to measure the Equivalent Resistance Common Drain Stage or Source Follower Common Gate Amplifier Large Signal Behavior Calculation of Input Resistance of a Common Gate Stage

Inverter with Enhancement n- Type MOS as Load Inverter with Linear Enhancement Type Load

Common Gate Amplifier

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Common Gate Amplifier

This is an amplifier where the input is applied to the Source and output is collected across the Drain.

The Gate is connected to a dc voltage called bias which ensures the device is operating properly.

The figures 10 (a) and (b) show two different circuits depicting the operation of Common Gate Amplifier / connection

Figure 10 (a) Common Gate with Direct Coupling (b) Common Gate with Capacitive Coupling

In Figure 10(b), the MOS is biased by a constant current source and the signal is capacitively coupled to the input of the circuit

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