A 0.6–4.0 GHz RF-Resampling Beamforming Receiver with Frequency-Scaling True-Time-Delays up to Three Carrier Cycles

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020
Major/Subject
Mcode
Degree programme
Language
en
Pages
Series
IEEE Solid State Circuits Letters
Abstract
True-time-delays (TTDs) enable wideband analog and hybrid beamforming by mitigating the beam squint problem. This letter reports a TTD 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 TTDs for large arrays at low-GHz frequencies where long delays are required due to \lambda _{c}/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 TTD 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.
Description
| openaire: EC/H2020/704947/EU//ADVANTAG5
Keywords
Analog beamforming, beam squint, CMOS, hybrid beamforming, phased array, radio receiver, resampling, RF sampling, spatial filtering, true-time-delay
Other note
Citation
Spoof, K, Zahra, M, Unnikrishnan, V, Stadius, K, Kosunen, M & Ryynänen, J 2020, ' A 0.6–4.0 GHz RF-Resampling Beamforming Receiver with Frequency-Scaling True-Time-Delays up to Three Carrier Cycles ', IEEE Solid State Circuits Letters, vol. 3, 9152038, pp. 234 - 237 . https://doi.org/10.1109/LSSC.2020.3012654