Kroupa, Venceslav F. 编

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"With the advent of integrated circuits (IC), digital systems have become widely used in modern electronic devices, including communications and measurement equipment. Direct Digital Frequency Synthesizers (DDS) are used in communications as transmitter exciters and local oscillators in receivers. The advantages are superior frequency stability, the same as that of the driving clock oscillator, and short switching times. The difficulties are lower output frequencies and rather large spurious signals. Compiled for practicing engineers who do not have the prerequisite of a specialist's knowledge in Direct Digital Frequency Synthesizers (DDS), this collection of 40 important reprinted papers and 9 never--before published contributions presents a comprehensive introduction to DDS properties and a clear understanding of actual devices. The information in this volume can lead to easier computer simulations and improved designs. Featured topics include: * Discussion of principles and state of the art of wide--range DDS.* Investigation of spurious signals in DDS.* Combination of DDS with Phase Lock Loops (PLL).* Examination of phase and background 'noise' in DDS.* Introduction to Digital to Analog Conversion (DAC).* Analysis of mathematics of quasiperiodic omission of pulses. DDFS can also serve as a textbook for students seeking essential background theory." Sponsored by: IEEE Ultrasonics, Ferroelectrics and Frequency Control Society