Military Embedded Systems

SFDR Considerations in Multi-Octave Wideband Digital Receivers


August 02, 2021

SFDR Considerations in Multi-Octave Wideband Digital ReceiversElectronic warfare (EW) receivers must intercept and identify unknown enemy signals among a congested wideband spectrum of multiple interfering signals without the benefit of dynamic range and sensitivity improvement techniques employed in communications and radar receivers. The incident RF band limiting employed in communications receivers is an unwanted trade for the EW receiver that seeks to process ever wider instantaneous bandwidth in less time. In the radar realm, receiver dynamic range benefits from matched filtering, whereby the received radar return is correlated with a copy of the transmitted signal. Alas, the EW receiver has no prior knowledge of the signal to be intercepted and thus nothing with which to correlate! It’s like searching a crowd of people for a stranger you’ve never seen before ... and worse yet, he is hiding, or maybe isn’t even there!

Now for the good news: over the coming years, high sample rate analog-to-digital converter (ADC) and digital-to-analog converter (DAC) technology will usher in a wideband digital receiver architectural evolution. Most importantly, converters from Analog Devices will maintain the excellent linearity, noise performance, and dynamic range of legacy lower rate digital converters. The workhorse super- heterodyne tuner will give ground to direct sample and direct conversion architectures.1 Adaptive spectral tuning will continue to shift from the RF to the digital signal processing realm.

Ready to view and download this whitepaper?

Read our Privacy Policy to understand what data we collect, why we collect it, and what we do with it. You may receive a request for your feedback from OpenSystems Media.

Featured Companies

Analog Devices

One Technology Way
Wilmington, Massachusetts 02062