Abstract
This work demonstrates the benefit of spatial selectivity that a 4-element passive-beamforming continuous-time DSADC can offer for the extreme dynamic range requirements in automotive radar. The beamforming-DSADC 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-DSADC consumes 7.3mW.
| Original language | English |
|---|---|
| Article number | 10988783 |
| Pages (from-to) | 4431-4441 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Circuits and Systems I: Regular Papers |
| Volume | 72 |
| Issue number | 9 |
| Early online date | 6 May 2025 |
| DOIs | |
| Publication status | Published - Sept 2025 |
Funding
This work was supported in part by Eindhoven University of Technology-NXP Semiconductors Collaboration for Master Graduation and Doctoral Projects. The work of Remco Schalk was supported by Eindhoven University of Technology, funded by Holland High Tech- TKI HSTM via PPS Allowance Scheme for Public-Private Partnerships under Project TKI2112P12.
Keywords
- Analog-digital conversion
- automotive radar
- beamforming
- delta-sigma modulation
- phase shifters
- phased arrays
- receivers