Designing Analog Circuits for Digital Signal Processing

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  • Author: Gary Breed
In all radio receiver circuits, the primary performance-deter-mining factors are noise and distortion. All other figures of merit are derived from them. This tutorial article reviews how these factors are handled differently in an all-analog system versus a system where the signal will be digitized for further digital sig-nal processing. Also note that the term “radio receiver” is meant to encompass a wide range of circuits, incuding classic radio communica-tions, test instrumentation, optical and RF cable communications, and various sensor technologies. The receive portion was chosen for this discussion because it involves the widest range of signal levels, along with a wide range of operating conditions that are beyond the control of the designer, such as propagation and interference.
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