Single Stage Amplifiers

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

Single Stage Amplifiers

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Single Stage Amplifiers

Amplifier is a device which increases the strength of the input signal applied. The amplification is done to improve the strength of the signal sometimes above the noise signal. Also in some cases the input signal is weak to drive a load of a subsequent stage.

Depending upon the amount of amplification to be done, the amplifiers are either single stage amplifiers or multi stage amplifiers i.e. more than one stage say two stage or three stage etc.

In this section we will see how a MOSFET can be used as an Amplifier from the knowledge of the MOS device learned so far.

In this section we discuss the Low Frequency behavior of single stage MOS Amplifiers

The Figure 1 shows the general Amplifier Block Diagram where input is taken as x(t) and output is taken as y(t)

The general Amplifier equation is given by:

y(t) =Ax(t)

Here A is called the gain.

Different categories / Topologies are shown in Table.

Common Source Stage	Source Follower	Common Gate Stage	Cascode
Resistive Load	Resistive Bias	Resistive Load	Telescopic
Diode-Connected Load	Current-Source Bias	Current-Source Load	Folded
Current-Source Load
Active Load
Source Degeneration

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Single Stage Amplifiers

Field Effect Transistors

Field Effect Transistors

Metal Oxide Semiconductor Field Effect Transistor - Mosfet

Metal Oxide Semiconductor Field Effect Transistor - Mosfet

Amplifiers

Amplifiers

Inverters

Inverters

Single Stage Amplifiers