Compact D-Band Passive Phase Shifters with Fine and Coarse Control Steps in BiCMOS-55nm
- Resource Type
- Conference
- Authors
- Piotto, Lorenzo; Filippi, Guglielmo De; Pirbazari, Mahmoud M.; Mazzanti, Andrea
- Source
- 2024 IEEE 24th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems (SiRF) Silicon Monolithic Integrated Circuits in RF Systems (SiRF), 2024 IEEE 24th Topical Meeting on. :25-28 Jan, 2024
- Subject
- Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Engineering Profession
General Topics for Engineers
Photonics and Electrooptics
Phased arrays
Radio frequency
Power transmission lines
Phase shifters
Switches
Transceivers
Silicon
D-band
BiCMOS
phase shifter
phased-array
- Language
- ISSN
- 2474-9761
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.