dc dc multiplier

Discussion in 'General Electronics Chat' started by dkthechamp, May 14, 2010.

  1. dkthechamp

    Thread Starter New Member

    Mar 3, 2010
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    Hi,

    I want to converter a DC signal between 20mV - 90 mV into higher range of DC 200mV to 900mV. Both active and passive solutions can be considered.

    Any suggestions/reference would be greatly appreciated.

    Thanks,
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    Would something like an op amp with a gain of 10 do?
     
  3. retched

    AAC Fanatic!

    Dec 5, 2009
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    NO. Wait. Yes. yes it would. ;)

    OP, what are you trying to do with the signal?
     
  4. dkthechamp

    Thread Starter New Member

    Mar 3, 2010
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    Since i'm working in CMOS based technology, an opamp can't work as the input signal is too low to generate enough Vgs for any MOS based transistor !

    The basic idea is to convert this DC voltage signal of range between 20 mV to 90 mV into current form (A V/I converter). But due to very low amplitude i classic solutions are not adaptive here.
     
  5. retched

    AAC Fanatic!

    Dec 5, 2009
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    If you are using an active solution, I dont see why it would be a problem.

    These are done regularly in micropower harvesting. And even digital scales.

    Are you restricted to a particular design technique or is this a challenge or assignment where you must adhere to specific standards?

    Basically what Im asking, Is: Does anything go?

    Im going to go ahead and give you a link I believe is doing what you want.

    It can and has boosted 34mV to 1v. It is used to generate power from body heat for use in pacemakers and other equipment where battery access is difficult.

    Operates from 20mV to 250mV input, and outputs 1v

    http://wireless.ee.washington.edu/papers/CarlsonOtis_VLSI2009.pdf
     
    Last edited: May 16, 2010
  6. retched

    AAC Fanatic!

    Dec 5, 2009
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    And here is an IC to do what you want:
    http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1799,P90287

     
  7. dkthechamp

    Thread Starter New Member

    Mar 3, 2010
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    Thanks for your response and the link. But the said paper is about getting a regulated supply of 1 V and i'm interested in converting the voltage between 20mV-90mV to a range, let's say between 200mV-900mV.

    The multiplication factor should remain constant for this particular range. Certainly i don't loose the amplitude during conversion, as it would a loss of precision for the targeted application.

    **I'm aware of this IC but i'm working on an integrated SoC, hence no other chip but open to few external passive component if at all necessary.
     
  8. AlexR

    Well-Known Member

    Jan 16, 2008
    735
    54
    An opamp would work and Vgs has nothing to do with it. Think bias!
    However as it is a fairly low level signal and you seem to need a high impedance input you might be better off looking at an instrumentation amp.
     
  9. retched

    AAC Fanatic!

    Dec 5, 2009
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    I see. negative biasing, or using a -v on on the instrumentation amp, will handle it. Vgs shouldn't be a no concern.

    [ed]
    Ive gotta refresh sooner. Quick Alex. ;)
    [/ed]
     
    Last edited: May 16, 2010
  10. dkthechamp

    Thread Starter New Member

    Mar 3, 2010
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    Could you please provide any circuit/reference on this, which consumes ultra low power (of the oder of few nWs) and can work with a Voltage supply Vdd of 1.2V.

    Thanks to all :)
     
  11. retched

    AAC Fanatic!

    Dec 5, 2009
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    I do not have any hands on experience with any of the nanoWatt ICs you are interested in, but I can offer some direction.

    Start searching for micro-power harvesting technologies, schematics, and components.

    This should give you a good start on your journey.
     
    dkthechamp likes this.
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