Sub-harmonic wireless injection locking of a THz CMOS chip array

Samuel Jameson, Eliezer Halpern, Eran Socher

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations


A novel concept is introduced for generating high power frequency locked THz radiating based on CMOS chips. The concept is based on an array of CMOS VCO chips with on-chip ring antennas. With fundamental mm-wave oscillation around 115 GHz, the 3rd harmonic of 0.35 THz is radiated with record total radiated power (TRP) of -4.3 dBm, EIRP of +3.8 dBm, DC-to-THz efficiency of 1.4% and phase noise better than -95 dBc/Hz at 10 MHz offset. Using a buffer-less Colpitts topology both improves the output power and efficiency but also allows wireless locking of the VCO fundamental frequency using the on-chip antenna, which is an RF-choke for that frequency. This allows wireless coupling between array CMOS chip elements integrated on-board for mutual locking and also wireless locking to an external D-band reference. The concept is demonstrated using a 1×4 array of CMOS radiating chips. The sources can be tuned from 343 to 347 GHz and the injection locking range is around 80 MHz. The 1×4 array has an EIRP of +13.8 dBm, a TRP and DC-to-THz efficiency of +1 dBm and 1.2%, respectively. The 1×4 array locked signal follows the phase noise of the external reference (+9.5 dB) up to a locking range around 80 MHz. This new concept enables simple and cost effective locked CMOS THz scalable source arrays.

Original languageEnglish
Title of host publicationProceedings of the 2015 IEEE Radio Frequency Integrated Circuits Symposium, RFIC 2015
EditorsDomine Leenaerts
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages4
ISBN (Electronic)9781479976416
StatePublished - 25 Nov 2015
EventIEEE Radio Frequency Integrated Circuits Symposium, RFIC 2015 - Phoenix, United States
Duration: 17 May 201519 May 2015

Publication series

NameDigest of Papers - IEEE Radio Frequency Integrated Circuits Symposium
ISSN (Print)1529-2517


ConferenceIEEE Radio Frequency Integrated Circuits Symposium, RFIC 2015
Country/TerritoryUnited States


  • CMOS
  • Injection locking
  • J-band
  • THz
  • VCO
  • W-band
  • antenna
  • source
  • wireless


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