A K-band frequency doubler with 35-dB fundamental rejection based on novel transformer balun in 0.13-μm SiGe technology

Sudipta Chakraborty, Leigh E. Milner, Xi Zhu, Leonard T. Hall, Oya Sevimli, Michael C. Heimlich

Research output: Contribution to journalArticle

32 Citations (Scopus)


A compact balanced frequency doubler with more than 35 dB odd-harmonic rejection and fractional bandwidth of 73% is presented in this letter. Wide bandwidth and high odd-harmonic suppression is achieved by adopting a new technique for the transformer balun design, resulting in a very low magnitude imbalance of 0.13 dB and a phase imbalance of 0.4° over 7-15 GHz. The balun performance is improved by offsetting the radius of the primary and secondary coils, which reduces the parasitic coupling capacitance. The input and output frequency ranges for the doubler are 7-15 GHz and 14-30 GHz respectively. The circuit was fabricated in 0.13-μm SiGe technology. The chip size is 0.6 mm ×, 0.4 mm.

Original languageEnglish
Article number7572154
Pages (from-to)1375-1378
Number of pages4
JournalIEEE Electron Device Letters
Issue number11
Publication statusPublished - 1 Nov 2016



  • bandwidth
  • Frequency doubler
  • SiGe
  • transformer balun

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