Compact D-Band Passive Phase Shifters with Fine and Coarse Control Steps in BiCMOS-55nm

Programmable phase shifters are key building blocks in emerging Sub-THz phased array transceivers. This work proposes different structures to implement compact passive phase shifters in D-Band (110-170GHz). Tunable bandpass filters and variable-delay transmission lines are evaluated as phase shifter...

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Bibliographic Details
Main Authors: Piotto, Lorenzo, Filippi, Guglielmo De, Pirbazari, Mahmoud M., Mazzanti, Andrea
Format: Conference Proceeding
Language:English
Subjects:
BiCMOS
D-band
phase shifter
Phase shifters
Phased arrays
phased-array
Power transmission lines
Radio frequency
Silicon
Switches
Transceivers
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Summary:Programmable phase shifters are key building blocks in emerging Sub-THz phased array transceivers. This work proposes different structures to implement compact passive phase shifters in D-Band (110-170GHz). Tunable bandpass filters and variable-delay transmission lines are evaluated as phase shifters with fine control resolution over a limited range. To extend the range, 0°/180° and 0°/90° phase shifters are also investigated and implemented with a hybrid coupler and a switched \lambda/4 transmission line. Experimental results are presented on a test chip in a 9 metal BiCMOS technology with 55 nm MOS transistors used as switches. By combining the different structures, the full °/360° programmable range is covered from 120 GHz to 170GHz with a size of only 0.13\mathrm{m}\mathrm{m}^{2}. The estimated insertion loss is aligned with previous works, but the remarkable footprint reduction facilitates the adoption in dense sub-THz phase array systems.
ISSN:2474-9761
DOI:10.1109/SiRF59913.2024.10438529