Communication Engineering - Chapter 6 - Noise

INTRODUCTION ,[object Object],[object Object],[object Object],[object Object],[object Object]

NOISE ,[object Object],[object Object],[object Object],[object Object],[object Object]

Classification of Uncorrelated Noise NOISE EXTERNAL INTERNAL ATMOSPHERIC NOISE EXTRATERRESTRIAL NOISE INDUSTRIAL NOISE THERMAL NOISE SHOT NOISE Figure 6.1

ATMOSPHERIC NOISE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

EXTRATERRESTRIAL NOISE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

INDUSTRIAL NOISE ,[object Object],[object Object],[object Object]

SHOT NOISE ,[object Object],[object Object],[object Object],[object Object],[object Object]

THERMAL NOISE ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

NOISE VOLTAGE ,[object Object],[object Object],[object Object],[object Object],The mathematical expression : Figure 6.2 : Noise source equivalent circuit

Example 1 ,[object Object],[object Object],[object Object],[object Object],[object Object]

Example 3 ,[object Object],[object Object],[object Object]

Example 4 ,[object Object],[object Object],[object Object],[object Object]

Correlated Noise ,[object Object],[object Object],[object Object],[object Object]

Intermodulation Distortion ,[object Object],[object Object],[object Object],[object Object]

Cont.. ,[object Object],[object Object],[object Object],[object Object]

Correlated Noise-Intermodulation Distortion f1 f2 V1 V2 f1 f2 f1-f2 f1+f2 V1 V2 V difference V sum Input frequency spectrum Output frequency spectrum Figure 6.4

Interference ,[object Object],[object Object],[object Object],[object Object]

Review Notes ,[object Object],[object Object],[object Object],Figure 6.5

Gain ,[object Object],[object Object],[object Object],[object Object],Figure 6.6

Attenuation ,[object Object],[object Object],[object Object],[object Object],Figure 4.7 Voltage divider introduces attenuation

[object Object],Figure 6.8 Total attenuation in cascaded network Figure 6.9 Gain offsets the attenuation

Figure 6.10 Total gain is the product of the individual stage gains and attenuation

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Signal to Noise Ratio (SNR) ,[object Object],[object Object]

Example 10 ,[object Object],[object Object]

Noise Factor (F) and Noise Figure (NF) ,[object Object],[object Object]

Cont.. ,[object Object],[object Object]

Ideal Noiseless Amplifier Ideal Noiseless Amplifier Ap=power gain Figure 6.11

Non ideal amplifier Nonideal amplifier Ap=power gain Nd=internally generated noise Figure 6.12

Example 11 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Noise Figure of Cascaded Amplifier Ap1 NF1 Ap2 NF2 Ap3 NF3 Input Output Figure 6.13

Equivalent Noise Temperature (T e ) ,[object Object],[object Object],[object Object]

Example 16 ,[object Object],[object Object],[object Object],[object Object]

Communication Engineering - Chapter 6 - Noise

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Communication Engineering - Chapter 6 - Noise

Editor's Notes