A 4-Element Passive-Beamforming CT- ΔΣ ADC for Spatial Selectivity in Automotive Radar
Year: 2025
Type: article
Abstract: This work demonstrates the benefit of spatial selectivity that a 4-element passive-beamforming continuous-time ADC can offer for the extreme dynamic range requirements in automotive radar. The beamforming-ADC is implemented in 40nm CMOS by R2R-based vector modulators as feed-in coefficients in combination with low-power implementations of a 4th-order inverter-based loop-filter, 4-bit asynchronous SAR-based quantizer and 4-bit current-steering feedback DACs. This work obtains >30dB of interferer suppression when deep notches are formed to obtain an effective spatial blocker dynamic range of 73.1dB. With notch-smoothing, the versatility to reduce the peak-to-notch-depth to 8dB for channel equalization is demonstrated. The beamforming-ADC consumes 7.3mW.
Authors: Remco Schalk, Zitao Zhu, Marios Neofytou, Patrick van Mourik, Qilong Liu, Shagun Bajoria, Georgi Radulov, Lucien Breems
Institutions: Eindhoven University of Technology, NXP (Netherlands)
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4410114607