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Recent content by yen

  1. Y

    DC to DC converter's output capacitor

    Dear all, If I choose capacitor like ceramic capacitor or Tantalum capacitor, which is cheaper? My bulk is voltage mode, which compensation is suit for lower esr (like 30 mohm). Generally, the esr of ti or analog device's bulk is used from ? to ?. Can bulk be used the small esr? Is...
  2. Y

    Ideas for a clamp circuit in LDO

    Hi, Maybe we can use mirror pmos'size and use resistor to transfer the voltage. Use comparator's output to control pmos's gate voltage. Do you have any simple methods? If you know , please teach me . Thanks. Do you know line driver of DAC and common mode feedback? If you has any...
  3. Y

    Optimum value of dummy preamplifer for reducing offset error in ADC

    Dear all, I read papers about flash adc. Using average resistor can reduce offset error. I have some questions. 1.It must add dummy preamplifier. optimum value is 1/3*(Total preamplifer) = Dummy preamplifier But I read some papers which don't use optimum value. Why? 2.Why use resistor...
  4. Y

    How to determine the error amplifier’s gain and unit gain frequency for a LDO design?

    Re: LDO design questions Hello, I have two questions. 1.I want to design LDO. I have a question. How much of my power mos's size? It's size is larger, load current is larger. But it may be have a big capacitor. So how do I do? 2.I am studying Switching regulator. I don't understand...
  5. Y

    Questions and problems about LDO design

    Re: LDO question Dear all, I have a question. I simulate my LDO. I find my line regulation is negative. Do you think why? Thanks.
  6. Y

    A 12-Bit Intrinsic Accuracy High-Speed CMOS DAC

    12-bit intrinsic accuracy Dear all, Do you read this paper? I have some questions about this paper. 1.How do the equation form? 2.If the full scale is 20mA, what is the I(LSB)?why? Thanks.
  7. Y

    Questions about measuring current DAC

    Re: About measure dac
  8. Y

    Math question ( about SFDR of DAC)

    Dear all, I read this book " Kluwer - Cmos Data Converters for Communications". I have some questions about equations. I don't know how to generate. Like below. Thanks. http://www.wretch.cc/album/show.php?i=alexp&b=2&f=1308449706&p=1
  9. Y

    Questions about SFDR equations

    math of SFDR question Dear all, I read this book " Kluwer - Cmos Data Converters for Communications". I have some questions about equations. I don't know how to generators. Like below figure. Thanks very much.
  10. Y

    Questions about mismatch of pmos/nmos

    mismatch question Dear all, I have some question about mismatch question. 1.Why is a larger mismatch of pmos device for Vτ? 2.Which (pmos or nmos)is thermal noise larger ? 3.What is the threshold adjust implant? 4.What are Avτ and Aβ? thanks very much.
  11. Y

    Anyone study the pape"A 14-Bit intrinsic Q2 Random Walk

    Re: Anyone study the pape"A 14-Bit intrinsic Q2 Random
  12. Y

    Anyone study the pape"A 14-Bit intrinsic Q2 Random Walk

    Re: Anyone study the pape"A 14-Bit intrinsic Q2 Random I have the same question. And I also other question. How do I generator the picture? Thanks.
  13. Y

    Questions about measuring current DAC

    Dear all, I want to measure my current dac. I have some question. 1.How do I measure my INL and DNL using multimeter? Because my current dac has 12 bits and 500MHz. Too many points. How do I measure INL and DNL by using multimeter? Or if you have some good method , please tell me...
  14. Y

    Post-simulation questions

    Dear all, I use calibre-pex but I don't see any choices for killing that I don't need capacitors. Thanks.
  15. Y

    How to do measuring? Help me Im a newbie

    Re: Measure question My 12 bit current dac's clock is 500MHz. My digital power is 1.8V and analog power is 3.3V. My outputs must connet to 50 ohm resistors.
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