1

Amplitude (Linear) Modulation

Lecture 8

2

Modulation

• Modulation is the process that causes a shift in the range of frequencies in a signal

• Baseband communication----does not use modulation

• Carrier Communication----uses modulation• Continuous Wave Modulation

– AM…Linear– Angle Modulation….Nonlinear

• FM• PM

3

4

5

6

7

Figure 4.1: DSB-SC Modulation

8

Figure 4.1: DSB-SC Demodulation

9

10

11

12

13

14

15

16

17

18

Diode-Bridge Modulator

19

20

Ring Modulator

21

22