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power consumption of integrated circuit in 0.13µm CMOS technology

Discussion in 'Electronic Basics' started by Geronimo Stempovski, May 11, 2007.

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  1. Hi all,

    currently I am investigating a data sorting algorithm on hardware. The
    algorithm was implemented in VHDL and is currently running on a Xilinx
    Virtex-II Pro XC2VP70 - FF1704 FPGA. Power consumption is a crucial aspect
    in the target application. Therefore I made an analysis with the Xilinx
    Virtex-II Pro Web Power Tool ( and obtained satisfying

    Now I'd like to make an estimation what this circuit would consume on a
    comparable ASIC 0.13µm CMOS technology (the FPGA is also based on a 0.13µm
    CMOS technology). The target clock frequency is 180 MHz, activity ratio is
    15%. Is there any rule of thumb or calculation rule?

    Any help is highly appreciated !!!!

    Regards Gero
  2. Del Cecchi

    Del Cecchi Guest

    power is .5*c*v**2*f*sf. Sounds like you know everything but C. So you
    would need to synthesize or otherwise get a gate count, assume a load
    per gate and go from there.
  3. austin

    austin Guest

    C * F * V^2 = P

    There is no "1/2", as you get power when you charge, and also when you
    discharge a node.

    E=1/2 CFV^2 is appropriate for energy stored in a capacitor, not for the
    power dissipated when nodes are switching (Charging AND Dis-charging).

  4. Del Cecchi

    Del Cecchi Guest

    true for clocks but data lines usually only transition one direction per
    cycle at most. so conventionally SF=2 for clocks in power calculators.
  5. John Larkin

    John Larkin Guest

    There are several design houses that specialize in flipping fpga
    designs to asics. I bet one of them would give you a quick estimate.
    Google "fpga asic conversion service" or something like that.

  6. Peter Alfke

    Peter Alfke Guest

    If you want to retain the 1/2, then I suggest you use T (for
    transition) instead of F (for frequency), in order to avoid the
    A factor of 2 might actually mean something :)
    Peter Alfke
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