A Differential Reflection-Type Phase Shifter Based on CPW Coupled-Line Coupler in 45nm CMOS SOI

This paper presents a mm-wave fully differential coplanar waveguide (CPW) vertically-coupled lines coupler and a reflection type phase shifter (RTPS) based on the proposed coupler. The use of grounded strip line structure for vertical coupling in CPW based coupler provides not only the improved coupling properties than the edge coupling but also provides the opportunity of using surrounding area efficiently to reduce area. The proposed coupler and phase shifter are designed and fabricated in 45nm CMOS SOI technology. Measured insertion loss of the coupler is ~ 6 dB from 18 to 43 GHz. A digitally controlled parallel LC load is used for controlling the phase of the phase shifter. Measured phase tuning range is 115 degrees, with insertion loss variation of 4.5 to 9 dB, for a frequency range of 39 GHz to 45 GHz. Total drawn area of the phase shifter is 0.214 mm2. The area of the proposed RTPS is smaller than the recently published state-of-the-art structures.

Authors:
Shaheen R. Azhar, Akbar Rehman, Rahkonen Timo, Aikio Janne, Sethi Alok, Pärssinen Aarno

Publication type:
A4 Article in conference proceedings

Place of publication:
2019 16th International Symposium on Wireless Communication Systems (ISWCS) 27-30 August 2019 Oulu, Finland

Keywords:
5G, CMOS SOI, Hybrid Coupler, mmWave, Phase shifter, Phased Array

Published:

Full citation:
R. A. Shaheen, R. Akbar, T. Rahkonen, J. Aikio, A. Sethi and A. Pärssinen, “A Differential Reflection-Type Phase Shifter Based on CPW Coupled-Line Coupler in 45nm CMOS SOI,” 2019 16th International Symposium on Wireless Communication Systems (ISWCS), Oulu, Finland, 2019, pp. 558-561. doi: 10.1109/ISWCS.2019.8877191

DOI:
https://doi.org/10.1109/ISWCS.2019.8877191

Read the publication here:
http://urn.fi/urn:nbn:fi-fe2019111137651