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Switched capacitor op-amp

Discussion in 'Electronics Homework Help' started by pump, Nov 21, 2012.

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  1. pump


    Nov 4, 2011
    Really having trouble with these. To increase the gain of a SC op-amp circuit are the SC blocks cascaded to increase the impedance? I say this because with my limited understanding of FPAA's I assume you can't change the value of the capacitors. The clocks which are used to switch the capacitors cannot overlap so they have to be the same frequency but inverted. I can't think of what else can effect the impedance to increase the gain......... Help :)

    Hope explained this ok
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Is this a switched capacitor boost regulator??

    Do you have a schematic of it?
  3. Laplace


    Apr 4, 2010
    Have a look at the Anadigm AN120E04 Reconfigurable FPAA which consists of a 2 x 2 matrix of fully configurable switched capacitor configurable analog blocks (CABs), enmeshed in a fabric of programmable interconnect resources. One part of each CAB is a bank of 8 programmable capacitors. Each of these 8 capacitors is actually a very large bank of very small but equally sized capacitors. Each of these 8 programmable capacitors can take on a relative value between 0 and 255 units of capacitance. Circuit operation does not depend on the absolute value of these capacitors, but rather on the ratio between them... which tracks to better than 0.1% over process variations.
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