• DocumentCode
    399495
  • Title

    A 1.3-GHz IF digitizer using a 4th-order continuous-time bandpass ΔΣ modulator

  • Author

    Kaplan, T. ; Cruz-Albrecht, Jose ; Mokhtari, Mehran ; Matthews, Dave ; Jensen, Joe ; Chang, M. Frank

  • Author_Institution
    Hughes Res. Labs., Malibu, CA, USA
  • fYear
    2003
  • fDate
    21-24 Sept. 2003
  • Firstpage
    127
  • Lastpage
    130
  • Abstract
    We present a 4th-order, 3-bit, 4.3 GHz continuous-time bandpass ΔΣ modulator (CT-DSM) that can directly digitize a 1.3-GHz IF signal. We used the impulse-invariant transform to design the CT-DSM, which has a similar NTF (noise transfer function) as an idealized discrete-time modulator despite up to 1.6 clock delays in its feedback loop paths. The part was fabricated using InP HBT technology, and has a measured SNDR of 39 dB in a 200 MHz bandwidth.
  • Keywords
    UHF integrated circuits; analogue-digital conversion; bipolar integrated circuits; circuit feedback; delta-sigma modulation; transfer functions; 1.3 GHz; 200 MHz; 4.3 GHz; CT-DSM; HBT technology; IF digitizer; InP; NTF; continuous-time bandpass ΔΣ modulator; feedback loop path clock delays; impulse-invariant transform; noise transfer function; Bandwidth; Clocks; Delay; Delta modulation; Digital modulation; Discrete transforms; Feedback loop; Heterojunction bipolar transistors; Indium phosphide; Transfer functions;
  • fLanguage
    English
  • Publisher
    ieee
  • Conference_Titel
    Custom Integrated Circuits Conference, 2003. Proceedings of the IEEE 2003
  • Print_ISBN
    0-7803-7842-3
  • Type

    conf

  • DOI
    10.1109/CICC.2003.1249375
  • Filename
    1249375
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=399495