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Recent content by zilch

  1. Z

    LVS warning: Undefined parameter "Series"

    Hello, I was running LVS recently when I got this error/warning message: Undefined parameter "Series" ignored in file: /path As I checked the .cdl file generated from streaming out the schematic, it seemed the error came from the resistor. Does anyone know how will this parameter "Series" be...
  2. Z

    is a folded cascode opamp suitable for ultra low power application?

    Greetings to everyone. I am currently designing a folded cascode amplifier, but my concern is if it would be suitable for ultra low power application? like more or less, 50uW without sacrificing it's speed? Here is my reference for this design. I like this paper since the hand calculations...
  3. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    I changed my BGR circuit since my previous design is sensitive to supply variation. This is the schematic that I'm using now. I obtained a reference voltage of 550mV and a regulated output voltage of 1.2V (LDO) from a supply voltage of 1.3V.
  4. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    I see, thank you. I'll be back again for another update on LDO. :thumbsup:
  5. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    This is the difference between previous work (blue) and updated version (red). It has improved quite well, but the temperature coefficient is about 33ppm/C. I don't know if I should be contented with this so I can move on to LDO.
  6. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    aye! Yes, I think the problem is the current mirror. The aspect ratio is just 0.25. Ill make the channel length longer then. Thanks!
  7. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    What I mean is Vref increases upon varying supply voltage.
  8. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    I need to improve my BGR, it doesn't settle when I vary the supply voltage. Help. - - - Updated - - - Hi ljp, can you provide me a schematic for this? and do you have any detailed information/guide for this one? Sorry for the demand, I'm just too desperate to work this out.
  9. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    I've read that when using LVTs, the leakage current will be large. On the amplifier side, I've reach a gain of around 60dB. I don't know if this is enough, it's difficult to attain a gain of atleast 75dB.
  10. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    I've set the voltage to 1V minimum. Also, I am using LVT MOSFETs and I'm not sure if I'm doing this right.
  11. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    I'll be using this topology. I think this is enough.
  12. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    Sorry, I did not read it clearly. It says on the paper (W/L) of Mp2 = (1/1000)(W/L) of Mp1 - - - Updated - - - Update: The output of our rectifier is around 1.4V. And the battery that we are going to use is NiMH, which requires to be charged in a constant current. - - - Updated - - - What's...
  13. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    Considering the simplest topology of LDO, can I get a reasonable efficiency?
  14. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    The paper I suggested is a bit of a challenge. The W/L ratio is 1:1000. I don't know if it's possible in the technology that I'm using.
  15. Z

    [Moved]: Ultra-low Power Bandgap Reference design

    Hi ljp, do you have any suggestions or could you point me in the direction of some useful resources of LDOs with current limitation? Actually I have found one, "A Sub-1V CMOS LDO Regulator with Multiple Protections Capabilities" by Hung and Ceng. I dont know if this will be a good source to follow.
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