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Recent content by Fred556

  1. F

    How calculate gain in a LDO? What's my problem?

    I've done that but it doesn't works... I thinks it´s because my function but I don't know... dB20(VF("/vout")/VF("/vref")) I have always the same negative gain...
  2. F

    How to simulate LDO regulator open loop gain and PM ?

    Re: LDO Gain Hi, I'm doing an LDO and I would like to know the gain. Could you tell me how you do it? I'm doing dB20(VF("/vout")/VF("/vref")) but I'm not sure if it´s that. It's giving me a negative gain? Could you help me? thanks in advance
  3. F

    How calculate gain in a LDO? What's my problem?

    Hi, I'm trying to calculate the gain in my LDO but I don't know what I'm doing wrong... To calculate the gain, I'm doing dB20(VF("/vout")/VF("/vref)). But it's giving me an negative gain??? someone could help me? Thanks in advance.
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    How I do to shifte/pass Vin=0-3V to Vout=6-9V ? 0 needs to be 6, 1-7, 2-8 and 3-9V?

    I'm designing a circuit LDO but I don't have enough voltage so I need to increase it. But has to be linear...
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    How I do to shifte/pass Vin=0-3V to Vout=6-9V ? 0 needs to be 6, 1-7, 2-8 and 3-9V?

    Hi, could anyone give me an idea how I do this? I have a Vin is going from 0V to 3V but to my system works I need him to go to 6V to 9V. Any sugestions? I need to be linear, 0 correspond to 6; 0,5V to 6,5V ... and 3V to 9V.. He has to be with cmos technology. I'm a beginner, so I apologise...
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    What is wrong with my opamp gain?

    Thanks. I will do it. Thanks again for helping me.
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    What is wrong with my opamp gain?

    compensation network? could you give me some examples to search on the internet? thanks for the help.
  8. F

    What is wrong with my opamp gain?

    My line is like in "Zigzag" but I would like only one simple line like the second image in my first post. Do you have any idea why does this "up's and down's"? I don't know if I explain very well... thanks for helping me..
  9. F

    What is wrong with my opamp gain?

    Sorry.. I totaly forgot.. schematic opamp: bench test from book "Baker, 3 editio chapter 24":
  10. F

    What is wrong with my opamp gain?

    Could someone tell me why my opamp gain is like that? it's suposed to be like this... thanks in advance, I'm a beginner and I don't know what is the problem...
  11. F

    what I have to do to know the gain of an opamp (for beginner) in CADENCE

    my opamp schematic: and my bench schematic(from the book, baker 3ª edition chapter 24): thanks for helping me.
  12. F

    what I have to do to know the gain of an opamp (for beginner) in CADENCE

    could someone give me a tip why does my opamp gain is like this? it shouldn't have this "zigzag". Anyone know's the problem? I'm a beginner so I have no idea.. Thanks in advance.
  13. F

    what I have to do to know the gain of an opamp (for beginner) in CADENCE

    Hi, could you tell me how I can put an AC source? DC source is in analogLib (vdc) but I can't find an AC source... There is another name for an AC source? I was looking for vac but doesn't exist. Thanks.
  14. F

    what I have to do to know the gain of an opamp (for beginner) in CADENCE

    Re: See this CADENCE tutorial, sl. 14 & 15 : If I do an opamp with a negative feedback, what i have to write on the ouput in cadence? "value(db20(VF("/Vout")/(VF(“/Vmais”) –VF(“/Vmenos”))))" ? thanks a lot for helping me because I'm desperate... ---------- Post added at 18:27 ----------...
  15. F

    what I have to do to know the gain of an opamp (for beginner) in CADENCE

    Re: See this CADENCE tutorial, sl. 14 & 15 : In my ampop I don't have "outp" and "outn", I only have one ouput and not 3 like the one in the tutorial... Could you help? I want to calculate the gain, and th tutorial does: "value(db20(VF(“/outp”) –VF(“/outn”)) 0)" but if I had only one output...

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