A 200-250-GHz Phase Shifter Utilizing a Compact and Wideband Differential Quadrature Coupler

Raju Ahamed, Mikko Varonen, Dristy Parveg, Md Najmussadat, Yehia Tawfik, Kari A.I. Halonen

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)


This letter presents the design of a 200-250-GHz compact vector modulator (VM) phase shifter in a 0.13- μm SiGe bipolar complementary metal-oxide-semiconductor (BiCMOS) technology. A compact, low-loss, and wideband differential quadrature coupler is used to generate differential I/Q signals. The design details of the millimeter-wave wideband differential coupler is presented and compared with other I/Q generators by the 3-D electromagnetic (EM)-simulated results. The VM core is realized by two variable gain amplifiers based on Gilbert cell architecture. The measured phase shifter shows a gain of -10.3 dB for the maximum gain setting at 230 GHz. The phase shifter shows a -17 dB of gain for full 360° phase tuning range and a 10 dB of gain control. The maximum rms gain error and the phase error are 1.25 dB and 10°, respectively, from 200 to 250 GHz. The chip consumes a dc power of 55 mW and occupies a core area of 0.09 mm2.

Original languageEnglish
Pages (from-to)883-886
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Issue number7
Early online date17 Mar 2022
Publication statusPublished - 1 Jul 2022
MoE publication typeA1 Journal article-refereed


  • Coupler
  • Couplers
  • Gain
  • gain tuning
  • Generators
  • Metals
  • millimeter-wave (mm-wave)
  • Phase measurement
  • phase shifter
  • Phase shifters
  • phase tuning
  • phased array
  • Wideband
  • wideband.


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