A 220-320-GHz Vector-Sum Phase Shifter Using Single Gilbert-Cell Structure With Lossy Output Matching
- Authors
- Kim, Younghwan; Kim, Sooyeon; Lee, Iljin; Urteaga, Miguel; Jeon, Sanggeun
- Issue Date
- 1월-2015
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Beam forming; InP DHBT; lossy matching; single Gilbert-cell structure; vector-sum phase shifter (VSPS); WR-3 band
- Citation
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, v.63, no.1, pp.256 - 265
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
- Volume
- 63
- Number
- 1
- Start Page
- 256
- End Page
- 265
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94751
- DOI
- 10.1109/TMTT.2014.2376515
- ISSN
- 0018-9480
- Abstract
- This paper presents a wideband vector-sum phase shifter (VSPS) that operates over the entire WR-3 band (220-320 GHz). Compared to conventional VSPSs with double Gilbert cells, the proposed phase shifter employs a single Gilbert-cell structure for vector modulation. This reduces the output current combining ratio from 8: 2 to 4: 2, and boosts the impedance at the combining node, thus facilitating wideband output matching at upper millimeter-wave and terahertz bands. The simplified structure leads to a reduction in dc power consumption and chip area without sacrificing the 360 phase-shifting property. Lossy matching is applied at the Gilbert-cell output to further increase bandwidth and stability at the expense of relatively high loss. The phase shifter is implemented using a 250-nm InP DHBT technology that provides f(T) and f(max) exceeding 370 and 650 GHz, respectively. The measurements exhibit a wideband phase shift with continuous 360 degrees coverage and average insertion loss ranging from 11.8 to 15.6 dB for the entire WR-3 band. The root mean square amplitude and phase error among different phase states are less than 1.2 dB and 10.2 degrees, respectively. The input-referred 1-dB compression is measured at 0.7 dBm on average. The dc power consumption is 21.8-42.0 mW at different phase states.
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