Projects per year
Abstract
True-time-delays enable wideband analog and hy-brid beamforming by mitigating the beam squint problem. This paper reports a true-time-delay beamforming receiver supporting delays up to three carrier-frequency cycles. The implementation is the first published work in which the delays scale with the carrier frequency. The scaling enables true-time-delays for large arrays at low-GHz frequencies where long delays are required due to λc/2 antenna spacing. The delays are implemented through delayed resampling of a passive mixer’s discrete-time output. Driving the mixers with pulse-skipped local oscillator (LO) signals allows the delay range to exceed one carrier cycle. A polyphase receiver structure prevents aliasing of noise and unwanted tones caused by LO pulse-skipping. Our prototype implementation demonstrates squint-free beamforming for an 800 MHz instantaneous RF bandwidth. The proposed true-time-delay is efficient for large arrays since the power consumption per antenna is only 5–13 mW across the 0.6–4.0 GHz frequency range. The prototype was implemented in 28-nm FD-SOI CMOS, and the die area including bonding pads is only 1.2 mm2.
Original language | English |
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Pages (from-to) | 234 - 237 |
Journal | IEEE Solid State Circuits Letters |
Volume | 3 |
Early online date | 2020 |
DOIs | |
Publication status | Published - 2020 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Analog beamforming
- beam squint
- CMOS
- hybrid beamforming
- phased array
- radio receiver
- resampling
- RF sampling
- spatial filtering
- true-time-delay
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Projects
- 1 Finished
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ADVANTAG5: Advanced Wide-Band Transceiver Architectures for Beyond 5G Wireless Systems
01/05/2017 → 30/06/2020
Project: EU: Framework programmes funding