Abstract
Wideband beamforming is widely required in the sub-6GHz frequency band for 5G commutation and the next generation wireless communication (B5G). The true time delay is the most crucial component, especially in the sub-6GHz frequency band. This paper presents a new true time delay by using an N-path switch capacitor delay cell to break the tradeoff between bandwidth and delay range by introducing tunable sampling clocks. The non-idealities and limitations are discussed as well. In a 40-nm CMOS technology, the implemented true time delay achieves maximum 900ps delay at 3GHz and 500ps delay at 6GHz with 0.15% variation. Reliability of the design is verified by process variation simulation as well. The proposed topology provides a large delay range with a compact size, which is suitable for sub-6 GHz wideband applications.
Original language | English |
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Title of host publication | 2021 IEEE International Symposium on Circuits and Systems, ISCAS 2021 - Proceedings |
Publisher | Institute of Electrical and Electronics Engineers |
Number of pages | 4 |
ISBN (Electronic) | 9781728192017 |
ISBN (Print) | 978-1-7281-9201-7 |
DOIs | |
Publication status | Published - 27 Apr 2021 |
Event | 53rd IEEE International Symposium on Circuits and Systems, ISCAS 2021 - VIRTUAL, Daegu, Korea, Republic of Duration: 22 May 2021 → 28 May 2021 |
Conference
Conference | 53rd IEEE International Symposium on Circuits and Systems, ISCAS 2021 |
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Country/Territory | Korea, Republic of |
City | Daegu |
Period | 22/05/21 → 28/05/21 |
Keywords
- 5G
- Beamforming
- CMOS
- Sub-6 GHz band
- True time delay
- Wideband