Jun-Chau Chien

Publications (2)3.23 Total impact

• Source

  Available from: berkeley.edu

  Article: A 90 GHz Hybrid Switching Pulsed-Transmitter for Medical Imaging

  A. Arbabian, S. Callender, Shinwon Kang, B. Afshar, Jun-Chau Chien, A.M. Niknejad
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  ABSTRACT: This paper reports a fully integrated 90 GHz-carrier pulsed transmitter in 0.13 μm SiGe BiCMOS process for imaging applications. To obtain ultra-short programmable pulses, the transmitter employs a number of novel techniques including hybrid switching and Antentronics. The transmit path includes a quadrature VCO, PA driver, PA and the on-chip folded slot antenna. High speed ECL circuits generate and provide the short pulses in several operating modes. The transmitter achieves a record pulsewidth of 26 ps in the hybrid mode and 33 ps in the independent mode. This translates to >30 GHz of RF BW in the transmitter.
  IEEE Journal of Solid-State Circuits 01/2011; · 3.23 Impact Factor
• Source

  Available from: 63.27

  Conference Proceeding: A 90GHz-carrier 30GHz-bandwidth hybrid switching transmitter with integrated antenna

  A. Arbabian, B. Afshar, Jun-Chau Chien, Shinwon Kang, S. Callender, E. Adabi, S.D. Toso, R. Pilard, D. Gloria, A. Niknejad
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  ABSTRACT: A fully integrated 90 GHz-carrier pulsed transmitter with on-chip antenna and >30 GHz measured bandwidth is demonstrated in 0.13 ¿m SiGe BiCMOS. By exploring the benefits of hybrid PA/antenna switching and high-performance digital circuitry, the transmitter generates variable-width carrier-modulated pulses with minimum measured pulse width of 35 ps.
  Solid-State Circuits Conference Digest of Technical Papers (ISSCC), 2010 IEEE International; 03/2010