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 NXP Semiconductors


  • 9600bd FSK modem with driver for Personal Computer

  • Created: Aug 28, 2014

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Summary

This circuit is a simple high speed modem designed to meet the requirements for high speed data transfer. The common older model of modem is running on 1200 baud and 2400 that is 8 times slower than the new high speed modem. The latest V.92 modem standard is running on 8000 baud for both stream.


The 74AHC123AD device is a dual retriggerable monostable multivibrator that produces output pulse with pulse width control by three methods. The TL064 device is a low-power JFET-Input operational amplifiers which amplifies the signal. The RC circuits serves as the filter of the system. The diodes are for the rectification of signals and regulation. The transistor are for switching and amplifying of signals.


The design is suitable for the development of data communications technology. It is simple and cheap, therefore it is an excellent reference for modem improvements and modifications.

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