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Recent content by marshel

  1. marshel

    Efficiency of Analog IC Designing

    Can you do all the thing of a new design? Fab test lab debug and volume production quality tracing and customer's application support and so on The circuit design and layout is not the only two thing for a successful chip.
  2. marshel

    How to improve the psrr of a bandgap circuit?

    Use cascode current biasing, if not enough, use RC filter after the bandgap generation.
  3. marshel

    question about NPN match

    Compared to the 2nd and the 3rd, the 2nd is better. For the 2nd have the same ratio of area and perimeter of emitter base and collector.
  4. marshel

    How to estimate efficiency of DC-DC conveter in Cadence?

    hi, I think you may need to use the calculator to get a average value of the VIN*IN and VOUT*IOUT
  5. marshel

    inductorless chargepump boost up regulator

    here is a patent of charge pump DC/DC converter Charge pump dc/dc converters with reduced input noise
  6. marshel

    From 3.3V to 5V: charge pump or DC-DC converter?

    from 3.3V to 5V You can use charge pump. I know some of this kind of IC such as LTC3200 (Linear) REG710 (TI) and CP2128 (chiphomer)
  7. marshel

    [help] Design low ron power mosfet in standard CMOS?

    hi skjian You can try the three methods. 1. Forward biasing the souce to bulk voltage of the power PMOS, for example, use Schotty diode. 2. Use a low threshold voltage power PMOS. 3.Check the minimum output voltage of the buffer stage before the power PMOS, if the buffer can output lower...
  8. marshel

    Switching Regulator soft-start circuit design

    switching regulator soft start Good article. Thank IanP.
  9. marshel

    Analog Design : Some things to remember

    thanks 56/ ZERO-ESR caps may do more harm than good. I didn't find anything on google. There are lots of low esr caps. Where can I get a zero esr cap? For LDO,you can find out they always need the cap have some ESR to avoid oscillation.
  10. marshel

    voltage control question

    hi,you can use level shift circuit shown in the attachment, a very commaon logic transfer circuit used for different power voltage.
  11. marshel

    PWM to V with current feedback for LED driver design.

    The LM321 can work with the input voltage of 0V. What is the maximum voltage of your PWM I/P? I thiank this maybe not a safe salution.
  12. marshel

    how can i simulate the phase margin of this bandgap?

    simulate like this
  13. marshel

    ADC reference voltage circuit

    If the purpose of the 400p cap is for low noise and no ripple, there would be a resistor in series with the cap.So, why the op amp need drive the cap directly?
  14. marshel

    ADC reference voltage circuit

    hi,maybe I got a misunderstanding. what's the purpose of the 400p cap?
  15. marshel

    Help me fix circuit with TL783

    Re: Help Me!!!!!! So what about quasi-LDO structure? I think maybe you can change your exertnal circuit like that.
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