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Descrição: Electric Power Distribution Reliability
In the course of recent years or thereabouts, India has taken quick walks in the improvement of the power part both regarding upgrading power age and also in making power accessible to broadly disseminated regions of the nation. Keeping in mind the e
Power Distribution System
ANALOG AND DIGITAL COMMUNICATION Presentation by: KARTHIKA S. AP,ECE SSN College of Engineering
UNIT I FUNDAMENTALS OF ANALOG COMMUNICATION
Learning Objectives On completion of this session you will be able to: • Understand AM power distribution • Understand modulation by a complex waave
AM POWER DISTRIBUTION • The average power dissipated in a load by unmodulated carrier is given by Pc = (0.707 Ec )2 /R = (Ec )2 /2R • The upper and lower sideband powers are expressed mathematically as Pusb = Plsb = (m Ec /2)2 /2R
= m2 Ec2 /8R = m2 Pc /4
AM POWER DISTRIBUTION • Total power in an AM DSBFC envelope is Pt = Pc+ Pusb+ Plsb = Pc+ (m2 Pc /4) + (m2 Pc /4) = Pc+ (m2 Pc /2)
AM POWER DISTRIBUTION • Factoring Pc gives Pt = Pc[1+ (m2 /2)]
AM POWER DISTRIBUTION • From the AM power analysis the following characteristics can be noted 1. Carrier power is unaffected by the modulation process 2. m increases, Pt increases
AM POWER DISTRIBUTION • For m = 0, Pt is equal to Pc • For m = 1, total sideband power is one half of carrier power – most of the power is wasted in carrier since information is contained in the sideband – disadvantage of AM DSBFC
AM POWER DISTRIBUTION
AM CURRENT CALCULATION • The relationship between carrier current and the current of the modulated wave is
MODULATION BY COMPLEX INFORMATION SIGNAL • If carrier is amplitude modulated by complex wave, the combined coefficient of modulation is given by, mt = q m12 + m22 + m32 + mn2 m1 , m2 , m3 , mn @coefficient of modulation for input signals 1,2 ,3 , and n
MODULATION BY COMPLEX INFORMATION SIGNAL • The upper and lower sideband and total transmitted power is given as,
PROBLEMS 2. For an AM DSBFC wave with a peak unmodulated carrier voltage Pc =10 Vp, a load resistance RL = 10Ω, and a modulation coefficient m = 1, determine (a) powers of the carrier and upper and lower sidebands (b) total sideband power (c) total power of the modulated carrier (d) draw the power spectrum
