THE DIGITAL AMPLITUDE MODULATOR

Timothy P. Hulick, Ph.D., W9QQ
886 Brandon Lane
Schwenksville, PA 19473


Abstract.
This paper is the first of two presenting the Digital Amplitude Modulator and the Digital Linear Amplifier. One leads to the other with the Digital Amplitude Modulator the precursor and the first theorized. Linear amplitude modulation in very high power full carrier systems still requires rather large solid state or vacuum tube devices in Medium Wave (MW) and Short Wave (SW), telephone and VHF and UHF ....etc

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: RADHIKA U.K(42)
: REMYA JOHNY(44)
: SANGEETHA THOMAS(46)
: SUBIN P SUNNY(54)

CONTENTS

INTRODUCTION
OBJECTIVE
BLOCK DIAGRAM
CIRCUIT DIAGRAM
WORKING
COMPARITIVE STUDY OF CIRCUIT WITH AND WITHOUT PWM
FEATURES
ADVANTAGES AND DISADVANTAGES OF LED
COMPARISON OF LED LAMPS WITH OTHER LIGHTING TECHNOLOGIES
CONCLUSION
FUTURE SCOPE
REFERENCES

INTRODUCTION
Growing demand for th ....etc

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Amplitude &Frequency Modulation



Modulation Methods

In the modulation process, some characteristic of a high-frequency
sinusoidal carrier is changed in direct proportion to the instantaneous
amplitude of the baseband signal. The carrier itself can be
described by the equation


Zero Span and Markers


One possibility, if the percent modulation is high enough, is
to use the analyzer as a fixed-tuned receiver, demodulate
the signal using the envelope detector ....etc

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PRESENTATION
ON
Modeling and Simulation of Space Vector Pulse Width Modulation (SVPWM) Scheme for Inverter Using MATLAB/SIMULINK

Under the Guidance of:
Krishna Kumar Gupta
I Sem. PhD

Presented by:
Sch. No. 093113101
Dr. Shailendra Jain
Associate Professor

content

Review of Theory of Space Vector Pulse Width Modulation (SVPWM) Technique
Steps to Realize SVPWM
MATLAB/Simulink Model
Details of Various Blocks
Results and Comparisons
Conclusions
Reference ....etc

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Introduction to Pulse Width Modulation (PWM)
In this technique several pulses are produced in each half – cycle but the width of the pulses
is not the same as in case of multiple – pulse width modulation, however the width of each pulse is
varied in accordance with the amplitude of the sine wave reference voltage. The width of the pulse
at the center of the half – cycle is maximum and decreases on either side. The figure 6(a) shows the
generation of the output signal by comparing a sinusoidal reference sign ....etc

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top 10 viva question on amplitude shift keying
top 10 viva wuetion for amplitude shift keying ....etc

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Matched Filtering and Digital Pulse Amplitude Modulation (PAM

Outline

Transmitting one bit at a time
Matched filtering
PAM system
Intersymbol interference
Communication performance
Bit error probability for binary signals
Symbol error probability for M-ary (multilevel) signals
Eye diagram
....etc

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1. INTRODUCTION
Pulse Width Modulation (PWM) technique is an effective way of controlling the speed of induction motor, and thus allowing the motor to be applied in the area requiring speed control. Available techniques to control the speed of induction motor are: varying the slip by changing rotor resistance or terminal voltage and varying synchronous speed by changing number of poles or supply frequency. Changing rotor resistance requires wound-rotor induction motor and any resistances inserted to the rotor circu ....etc

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