Low-loss and broadband asymmetric broadside-coupled balun for mixer design in 0.18-μm CMOS Technology

Hwann Kaeo Chiou, Tsung Yu Yang

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

This study presents an asymmetric broadside coupled balun with low-loss broadband characteristics for mixer designs. The correlation between balun impedance and a 3-D multilayer CMOS structure are discussed and analyzed. Two asymmetric multilayer meander coupled lines are adopted to implement the baluns. Three balanced mixers that comprise three miniature asymmetric broadside coupled Marchand baluns are implemented to demonstrate the applicability to MOS technology. Both a single and dual balun occupy an area of only 0.06 mm 2. The balun achieves a measured bandwidth of over 120%, an insertion loss of better than 4.1 dB (3 dB for an ideal balun) at the center frequency, an amplitude imbalance of less than 1 dB, and a phase imbalance of less than 5° from 10 to 60 GHz. The first demonstrated circuit is a Ku-band mixer, which is implemented with a miniaturized balun to reduce the chip area by 80%. This 17-GHz mixer yields a conversion loss of better than 6.8 dB with a chip size of 0.24 mm2. The second circuit is a 1560-GHz broadband single-balanced mixer, which achieves a conversion loss of better than 15 dB and occupies a chip area of 0.24 mm2. A three-conductor miniaturized dual balun is then developed for use in the third mixer. This star mixer incorporates two miniature dual baluns to achieve a conversion loss of better than 15 dB from 27 to 54 GHz, and occupies a chip area of 0.34 mm2.

Original languageEnglish
Article number4470585
Pages (from-to)835-848
Number of pages14
JournalIEEE Transactions on Microwave Theory and Techniques
Volume56
Issue number4
DOIs
StatePublished - Apr 2008

Keywords

  • Asymmetric broadside coupled
  • Balun
  • CMOS
  • Millimeter wave
  • Mixer
  • Silicon monolithic microwave integrated circuit (MMIC)

Fingerprint

Dive into the research topics of 'Low-loss and broadband asymmetric broadside-coupled balun for mixer design in 0.18-μm CMOS Technology'. Together they form a unique fingerprint.

Cite this