The FSK circuit composed of ME564

Published:2011/7/14 5:29:00 Author:Borg | Keyword: FSK circuit | From:SeekIC

This is the FSK circuit which is composed of ME564. In the circuit, NE564 is a simulating PLL integrated circuit, the FSK modulation is done by CD4016 analog switch which is controlled by dual-state signals. CD4016 makes the 2-pin of NE564 in the voltage of 5V and 1.42V, i.e 5Vx[R2/(R1十R2)]=1.42V. The bias current of the power supply phase detector is controlled by the voltage on 2-pin. Therefore, when the phase is continuous, the output of the VCO can be changed. The capacitor C0 which determines the central frequency of VCO does not change, the drift between FSK frequencies can be adjusted by R1 and R2.



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