A 220-320-GHz vector-sum phase shifter using single Gilbert-cell structure with lossy output matching

Younghwan Kim, Sooyeon Kim, Iljin Lee, Miguel Urteaga, Sanggeun Jeon

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 fT and fmax exceeding 370 and 650 GHz, respectively. The measurements exhibit a wideband phase shift with continuous 360° 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°, 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.

Original languageEnglish
Article number6979282
Pages (from-to)256-265
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume63
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Fingerprint

Phase shifters
broadband
output
Electric power utilization
cells
phase error
Insertion losses
acceleration (physics)
Millimeter waves
Phase shift
insertion loss
millimeter waves
phase shift
chips
Modulation
impedance
bandwidth
Bandwidth
modulation

Keywords

  • Beam forming
  • InP DHBT
  • lossy matching
  • single Gilbert-cell structure
  • vector-sum phase shifter (VSPS)
  • WR-3 band

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

Cite this

A 220-320-GHz vector-sum phase shifter using single Gilbert-cell structure with lossy output matching. / Kim, Younghwan; Kim, Sooyeon; Lee, Iljin; Urteaga, Miguel; Jeon, Sanggeun.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 63, No. 1, 6979282, 01.01.2015, p. 256-265.

Research output: Contribution to journalArticle

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