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Single Stage Amplifiers

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Advanced VLSI Design Lab. IIT Kharagpur. Some Fundamental Issues ... Small Signal Analysis. Rout. Common Drain Stage (Buffer) Common Gate Stage (Low Input Impedance) ... – PowerPoint PPT presentation

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Title: Single Stage Amplifiers


1
Single Stage Amplifiers
  • Subho Chatterjee
  • Advanced VLSI Design Lab
  • IIT Kharagpur

2
Some Fundamental Issues
  • Large Signal and Small signal analysis.
  • The i/p o/p characteristic is approximated as
  • y(t) a0a1x(t)
  • a0 is the operating(bias) point
  • a1 is the small signal gain
  • CONDITION a0gtgta1x(t)

3
MOS Transistor
4
Ids vs Vds

Long Channel
Short Channel
5
MOSFET Operating Regions
  • Strong Inversion VGS gt VT
  • Linear (Resistive) VDS lt VDSAT
  • Saturated (Constant Current) VDS ? VDSAT
  • Weak Inversion (Sub-Threshold) VGS ? VT
  • Where VDSATVGS-VT

6
Transistor in Linear Region
7
Transistor in Saturation
8
Current Equations
9
Parameters
10
Small Signal Model
11
Single Stage Amplifier Contents
  • Fundamentals
  • Basic Amplifiers Low Frequency Analysis
  • Basic Amplifiers High Frequency Analysis

12
Fundamentals
  • DC Operating Point Load line
  • MOSFET intrinsic Capacitances

13
DC Operating Point Load Line
14
AMPLIFICATION
15
High Freq. Small Signal Model
16
MOSFET Intrinsic Capacitances
17
Single Stage Amplifiers CS, CD, and CG Stage
18
Common Source Stage Voltage Gain
19
Loads for basic amplifiers
  • Diode Connected Load

20
Loads for basic amplifiers
  • Source degeneration

21
Cascode Stage
  • Small Signal Analysis
  • Rout

22
Common Drain Stage (Buffer)
23
Common Gate Stage (Low Input Impedance)
24
Summary
25
Loads for basic amplifiers
26
Basic Amplifiers High Frequency Analysis
27
Frequency Analysis
28
Frequency Analysis
  • Bode Plot

29
Bandwidth Comparison
30
  • THANK YOU!
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