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FSK modulation demodulation

1.1 ABSTRACT: 2 .1 BLOCK DIAGRAM: Fig 2.1 Block diagram for FSK modulation and de-modulation 2.2.1 PIN DIAGRAM- IC 565 : Fig 2.2 Pin diagram for IC 565 2.2.2 PIN DIAGRAM -IC 555: Fig 2.3 Pin diagram for IC 555 3.1 DESIGN CALCULATION: 3.1.1 FSK MODULATOR: ON time TH=0.693RBC OFF time TL=0.693(RA+RB)C Total time T=TH+TL=0.693(RA+2RB)C 1 f1= ————————– → (1) 0.69(RA+2RB) C1 1 f2= ———————————— →(2) 0.69(RA+2RB) C 1C2 ———– C1+C2 Duty cycle D=ON time/Total time=(RB)/(RA+2RB)=0.3 RB= 0.3RA+0.6RB RB=0.75RA Let f1= 1050 Hz, f2= 1250 Hz, C1=0.01μf From (1) 1 1050 = ——————————— 0.69(RA+2*0.75RA) 0.01μf 1 =——————————— 0.69*2.5RA*0.01μf RA=55.2KΩ RB=0.75RA RB=41.4KΩ From (2) 1 1250 = ———————————————— 0.69(55.2KΩ+2(41.4KΩ)) 0.01μf*C2 —————- 0.01μf+C2 0.01μf+C2 C2 = ———————————– 0.69(138KΩ)1250*0.01μf 0.01μf+C2 C2 = —————…