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Recent content by Alan_Nesta

  1. A

    can anyone tell about sc-integrator with single-to-diff?

    I've only found one method, use fully-diff op, neg-input with delay-connect, and pos-input with delay-free-connect and phase reverse. Can anayone tell if this will make some thd on the output? Or can anayone give me some other method?
  2. A

    A question about fully-diff folded-cascode with sc-cmfb

    I've seen it but it says sa sb are better when large really? my presim shown just inverse
  3. A

    A question about fully-diff folded-cascode with sc-cmfb

    how to check? I mean how to decrease this parameter in layout?
  4. A

    A question about fully-diff folded-cascode with sc-cmfb

    sa sb is about 3-5e-6 is it too large for 90nm process? my presim set the parameter about 5e-7
  5. A

    A question about fully-diff folded-cascode with sc-cmfb

    in layout how to decrease sa sb?
  6. A

    A question about fully-diff folded-cascode with sc-cmfb

    I've found the reason! sa sb is large! I only know the parameter as ad ps pd what is sa sb?
  7. A

    A question about fully-diff folded-cascode with sc-cmfb

    3.3v vdd presim ac and cmfb are both ok ac gain=75dB cmfb gain=70dB dc operation node OK cm-output=1.65v but when do c-only postsim gain is still large ac=73dB cmfb=65dB but cm output voltage is 1.5v! why? the op is p-input pair single stage cmfb connect to p-load of the cascode op
  8. A

    help for inductor initial current set

    initial current of inductor How to set initial current of an inductor in HSpice? Thank you!
  9. A

    Does battery charger need dc-dc converter?

    OK I know Can Someone give me some paper or thesis about Li-Ion architecture?
  10. A

    Does battery charger need dc-dc converter?

    For example input voltage=5v from USB output 4.2v need buck dc-dc? or only use voltage feedback-loop control enough?
  11. A

    slow CMFB clipping output

    agree with ricklin and surely cm bandwidth is difficult to be as large as dm.
  12. A

    How to use charge pump to realize 3.3-4.2v with ldo archi?

    Now a new project need it. Can anyone give me advice or reference papers? Thank you!
  13. A

    Urgent!! What kind of CMOS Opamp can drive 300nF cap?

    if only for cap-load, you can use 1-stage folded-cascode architecture, if you need large dc gain, you can add gain-boosting to it. 300nF load, 100kHz bandwidth, gm~200mS sr=5v/ms, so tail current~1.5mA need large current and large w/l for input pair.
  14. A

    How to perform a dither archi for 1-bit sigma-delta adc?

    take care not let quantizer overloading
  15. A

    Offset in a telescopic cascode OPAMP with SC-CMFB

    SC CMFB check if your cmfb output to bias current is right? because of Vds effect, bias current may be not very exactly.
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