Question

04: A- An arm-strong-type FM system is to handle in the audio range 100-300 Hz first generates FM signal with B = 0.2 and fo= 200K Hz the design output is required to have a carrier frequency to 40MHz and peak frequency deviation of 5KHz, using one frequency multiplier and one frequency mixer to design a system configration to accor the desired objective, determine the following parameters (fm. 4. fafcz), then draw the circuit?

Answer 1

from = 5k, - Solution ARM-Stoong Method fm (loo 00-300 H2)map = 30042 Az ß = 0.2; fi= 200 kHz if = of Af=B)(m) = 60Hz fm. for[Carmiey frequency) = 40MHz At conas) = 5kHz frequency Miren Frequency fc 2200612 fo - 40 M42- multiplier /m) for Of = 60H- SEP Aflmao) Now, fir = mfc Afi = 5 kriz W fez M(26) > M= sool M=500 Now, M ( multiplier) = 500 250 3 ... fer = 250 (200 H3) = 16067 250/200 kHz) = 16.67 fc,= 50 MHZ Now, for= fatfer= 40 MH12 » fcz = 40 MHz - 50 MM2 6 6 3 h 3 fcz 70 MHZ 3