A compact self-similar power combining topology

Kaushik Sengupta, Ali Hajimiri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


A compact, modular 16-way combiner is presented which is based on a self-similar combiner topology. The combiner achieves a simulated passive efficiency of 38% at 77 GHz in a standard 90nm process with I.49μm thick AI top metal. A 77 GHz power amplifier is built based on the combiner, combining the output power of 16 stages to achieve a Psat of 1I.4dBm, small signal gain of 9.4dB, and a 3dB bandwidth of more than 11 GHz on a 0.7V supply, with the optimal MAG for the technology being approximately 5dB at 77 GHz. The power amplifier is unconditionally stable with the K factor exceeding 3.8 between 50-90 GHz. The entire architecture is based on a modular power splitting and combining network that makes the design flexible and scalable. To the best of the authors' knowledge, this is the highest Psat reported at 77 GHz in CMOS with a sub IV quiescent Vds.

Original languageEnglish (US)
Title of host publication2010 IEEE MTT-S International Microwave Symposium, MTT 2010
Number of pages4
StatePublished - 2010
Externally publishedYes
Event2010 IEEE MTT-S International Microwave Symposium, MTT 2010 - Anaheim, CA, United States
Duration: May 23 2010May 28 2010

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Other2010 IEEE MTT-S International Microwave Symposium, MTT 2010
Country/TerritoryUnited States
CityAnaheim, CA

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • 77 GHz
  • CMOS
  • Millimeter wave
  • Power amplifier
  • Power combining
  • Self-similar


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