Rf and if digitization in Radio Receivers: Theory, Concepts, and Examples


RF AND IF DIGITIZATION IN RADIO RECEIVERS: THEORY, CONCEPTS



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RF AND IF DIGITIZATION IN RADIO RECEIVERS: THEORY, CONCEPTS

AND EXAMPLES 

Jeffery A. Wepman and J. Randy Hoffman

1

 

Hardware development of analog-to-digital converters (ADCs) and digital signal 



processors, including specialized integrated circuits, has advanced rapidly within 

the last few years. These advances have paved the way for development of radio 

receivers using digitization at the IF and in some cases at the RF. Applications for 

these receivers are expected to increase rapidly in areas such as cellular mobile

satellite, and personal communications services (PCS) systems. The constraints 

placed on these receivers due to hardware limitations of these devices are 

investigated in this paper. Some examples of state-of-the-art ADCs, signal 

processors, and specialized integrated circuits are listed. Various quantization 

techniques, nonlinear compression devices, postdigitization algorithms for 

improving dynamic range, sampling downconverters, and specialized integrated 

circuits are discussed as they are expected to be useful in the development of 

these types of receivers. Several examples of radio receivers employing 

digitization at the IF and RF are also presented. 

Key words:   analog-to-digital converters; automatic gain control devices; digital signal 

processors; digitization; logarithmic amplifiers; quantization; radio receivers; 

sampling downconverters; signal-to-noise ratio; spurious free dynamic range 




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