New-Tech Europe | May 2017

About the Author Peter Delos is a Technical Lead at Analog Devices, Inc., in the Aerospace and Defense Group. He received his BSEE from Virginia Tech in 1990 and MSEE from NJIT in 2004. He worked in the Naval Nuclear Power program from 1990 to 1997. This work included completion of the Naval Nuclear Power School Officer’s Program, work as an instructor in a Naval Submarine facility, and Lead Electrical Field Engineer work on the Seawolf class Submarines in Groton, CT. In 1997, Peter accepted a position with Lockheed Martin in Moorestown NJ and began a prolific career developing receivers/exciters and synthesizers for multiple Radar and EW programs. This experience encompassed architecture definition, detailed design, rapid prototypes, manufacturing coverage, field installations, and coordination among many engineering disciplines. This work led the migration of phased array receiver/exciter electronics from centralized architectures to on-array digital beamforming systems. In 2016, Peter accepted a position with Analog Devices in Greensboro, NC. He has nearly 20 years of experience in RF systems designing at the architecture level, PWB level, and IC level.

Figure 5: Receiver + A/D Noise

This leads to the concept of A/D sensitivity loss. A/D sensitivity loss is a measure of the receiver noise degradation due to the A/D. To minimize this degradation, the receiver noise is desired to be well above the A/D noise. The limitation comes in the form of dynamic range and larger receiver gain limits the maximum signal received without A/D saturation. Thus the receiver designer faces a constant challenge of balancing dynamic range vs. noise figure. Conclusion The heterodyne, direct sampling, and direct conversion receiver architectures have been reviewed with emphasis on benefits and challenges of each architecture. Recent trends and considerations in receiver design have also been presented. With the world wide desire for more bandwidth, combined with the advancement of GSPS data converters, it is anticipated that many varied receiver designs will proliferate well into the future. References 1. McClaning, Vito, “Radio Receiver Design,” New York, Noble Publishing, 2000. 2. “Fundamentals of RF and Microwave Noise Figure Measurements,” Keysight Application Note 3. Razavi, “Design Considerations for Direct-Conversion Receivers,” IEEE, 1997 4. Delos, “Receiver Design Considerations In Digital Beamforming Phased Arrays,” Microwaves and RF, 2014 5. Henderson, “Mixers in Microwave Systems” WJ Tech-Note, 1990. 6. Harris, “What’s up with Digital Downconverters” Part 1 and 2, Analog Dialogue, 2016 7. Kester, “Analog-Digital Conversion,” Analog Devices, 2004

INNOVATIVE CONNECTIVITY SOLUTIONS

Visit us on MIGVAN’s stand New-Tech Exhibition 2017 23-24 May,Tel Aviv

CORE

ULTIMATE

FIBEROPTIC

MINIMAX

Rugged, sealed, circular connectors Over 30,000 references Cable assembly solutions

THE RELIABLE EXPERT

www.fischerconnectors.com

New-Tech Magazine Europe l 25