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Recent content by refdv

  1. R

    RF filter? Problems with CMOS at 868MHz

    RF filter? the key element for designing BPF at high freq is to use active inductor...
  2. R

    problem with sigma-delta modulator

    tq for the book i am trying to realize the switched current method but i canot find any book on switched-current modulaters...
  3. R

    Delta Sigma Fractional-N Synthesizer

    fractional-n synthesizer The basic function of sigma delta modulator is to feedback the noise and from the output to the input this will make the noise higher but it is pushed outside of the signal bandwidth. This will reduce the noise in the signal!!
  4. R

    problem with sigma-delta modulator

    :cry: what is the relationship of sampling peroid and resolution
  5. R

    Schematic of a DC-DC converter (150-200 mA)

    an954 onsemi dc-dc converter ********************************************************* This post has been moderated by davorin. Action: attachment deleted Reason: Available at: **broken link removed** and: **broken link removed** Note: Please read rules before posting or uploading...
  6. R

    device noise in sigma delta adc simulation

    you can learn more about noise in sigma delta modulater in the basic of data converter book.
  7. R

    high accuracy sample and hold

    there may be also efect of parasitic capasitance on the switch if you are using mos transister as your switching devise.
  8. R

    problems in sample and hold for ADC

    why dont try switch current ...
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