biasing of analog circuit

Discussion in 'Cadence' started by fz, Aug 26, 2008.

  1. fz

    fz Guest

    Hi all,
    I came across a dc biasing problem of a homodyne receiver.
    The output of the direct conversion mixer is connected to a VGA. The
    first stage of VGA and the output of mixer have different DC biasing
    values. I know common source or source follower could be used to shift
    the DC bias. But we will lose the flexibility of tuning the biasing of
    VGA during experiment.
    Is there any other means to bias the VGA in this case?
    thanks

    fz
     
    fz, Aug 26, 2008
    #1
  2. fz

    Riad KACED Guest

    Dear Fz,

    Did you try to ask in the following forums ?
    1. http://www.designers-guide.org/Forum/
    2. http://www.edaboard.com/viewforum.php?f=88&sid=3c159b2c7f9cdd4ca6c48cd5e380b7d1

    I would recommand these links for more design/architecture related
    questions.

    if you have any troubles running your design under Cadence's DFII then
    this is definitelty the right group :)

    Good luck !
    Riad.
     
    Riad KACED, Aug 26, 2008
    #2
  3. fz

    fz Guest

    Hi Riad,
    Thanks for you suggestion,
    I just found this google group is a lot more convenient than those
    two.
    For those who are also interested in this problem, poojanwagh posted a
    very good solution here:
    http://www.circuitdesign.info/2008/08/calibrated-level-shifting-circuit/

    fz
     
    fz, Aug 29, 2008
    #3
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