Introduction


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Introduction
IntroductionCommunications receivers are seldom single-channel devices, but more often cover wide frequency ranges. In the superheterodyne receiver, this is accomplished by mixing the input signal with an LO signal. The LO source must meet a variety of requirements: It must have high spectral purity. It must be agile so that it can move rapidly (jump) between frequencies in a time frame that can be as short as a few microseconds. The increments in which frequencies can be selected must be small. Frequency resolution between 1 and 100 Hz is generally adequate below 30 MHz; however, there …
Citation
Prof. Dr.-Ing. habil. Dr. h.c. mult. Ulrich L. Rohde; Jerry C. Whitaker; Hans Zahnd: Communications Receivers: Principles and Design, Fourth Edition. Introduction, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export