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Data Modems with Integrated Digital Filters and Modulators

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2 Author(s)
van Gerwen, P. ; Philip Research Lab.,Eindhoven,The Netherlands ; van der Wurf, P.

The application of a binary transversal filter as transmitting filter and a digital circuit as modulator makes it possible to construct data transmitters consisting only of transistors and resistors. The modulation distortion, caused by the keying of a low-frequency square-wave carrier, can be compensated by a modification of the transfer function of the transmitting filter, provided the carder frequency is chosen to be a multiple of half the bit rate. This principle makes it possible to realize the whole data transmitter in one single integrated circuit. The binary transversal filter, provided with an analog-to-digital converter, can also be used to construct the data receiver for the greater part with digital circuitry.

Published in:

Communication Technology, IEEE Transactions on  (Volume:18 ,  Issue: 3 )