Front-End IMD in Receive Arrays: How Beamforming Sums Combine ADC Spurs
Abstract
Here the effects of placing an identical memoryless nonlinearity behind every element of an active receive array are first reviewed, following which several recently proposed ideas for mitigating nonlinear distortion in all-digital arrays are briefly examined. Examples assume an RF-sampled S-band radar receiver, even though the concepts apply to IF-sampled systems as well. A chirp waveform with a substantial time-bandwidth product is assumed in places as well. A nonlinearity prior to the RF filter, presumably in a low-noise preamp, is considered briefly, but the focus is on distortion introduced by the ADC that presumably follows the RF filter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 07, 2024
- Accession Number
- AD1223635
Entities
People
- J. O. Coleman
Organizations
- United States Naval Research Laboratory