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Recent content by vaah

  1. V

    Power Supply Induced Jitter (PSIJ)

    Hi all, What does it mean when we say PSIJ is e.g 4fs/mv? What does that per mV mean? and how does it change the simulation? Assuming that we have 20mV of noise on the supply voltage, & the total measured jitter at the output is 400f. Should I say 400f/20mV= 20fs/mV, is that correct? Thanks
  2. V

    what is .lib in cadence virtuoso?

    Thanks @frankrose TBH, I am not sure where it is being used but apparently, it is related to compiling for post design or sth. some people call it (dot lib or dotlib). I am not talking about cds.lib.
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    what is .lib in cadence virtuoso?

    Hi all, Can someone help me with my question. I have heard people asking about .lib and how to generate it etc. What is this file or what is its purpose? Thanks.
  4. V

    Best book for SerDes design

    Hi guys, I am looking for some good references for high-speed SerDes design... Any suggestions?
  5. V

    large signal simulation of a wide band amplifier

    Hi all, I was just wondering what are the proper analyses for a wideband amplifier, assuming a large signal is applied at the input. Analog designers usually use "ac" analysis for small signals. Yet, "hb" and "pss" analysis can be used, they require port and matching the signal at the...
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    decoupling capacitors to ground or supply voltage?

    Hi Very basic question, What power line do you connect your decoupling capacitor(s) to, ground or supply voltage? For example, say I have a reference voltage (Vref) and want to stabilize the voltage using a bypass (decoupling) capacitors. What should I consider when connecting the other end...
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    [SOLVED] Offset compensation feedback of multistage-amplifier

    Thank you for your help. What I want to know is that how the abovementioned equation is extracted not how the offset compensation is done. Are "Vos1" and "Vos" output offset or input offset? How come the total output offset is "sqrt[Vos^2 + (F*Vos1)^2]". - - - Updated - - - I figured it...
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    [SOLVED] Offset compensation feedback of multistage-amplifier

    Hi guys, I know that a DC-feedback loop can reduce offset in a multi-stage amplifier (more specifically limiting amplifier for high-speed link) I couldn't extract the equation how the offset is resourced by the feedback loop. I have seen from...
  9. V

    [SOLVED] current reuse technique

    Hi guys, I am looking for some technical words for "current reuse" technique. I have heard that there are other terminologies for this but theyv totally slipped my mind. Thank you.
  10. V

    [SOLVED] PTAT error in BJT based temperature sensors?

    Thank you very much @dick_freebird and @erikl . From my understading a source of error need not neccesarily be a PTAT type to be trimmed out. A CTAT can be also trimmed, right? Just to clarify, PTAT measn any signal that increaseing with tempearture while CTAT decreasing with temperature, is...
  11. V

    [SOLVED] PTAT error in BJT based temperature sensors?

    Hi guys, I have a doubt about trimming a temperature sensor. I have seen the fact that "for BJT based temperature sensors if an error/spread (for example current gain) is PTAT it can be easily trimmed out". Can someone enlighten me? It kinda makes sense since the output signal of the...
  12. V

    [SOLVED] how "if" statement in eldo works?

    Hello guys, I want to use sort of special function in a subcircuit. Let assume we have a subcircuit as specified below .subckt res X Y param: ro=10K R1 X Y ro if (((X)-V(Y))>=1) .param ro= 5K endif .ends It gives two errors as, + Syntax error in expression IF ( ( V ( X )-V(Y ) ) >...
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    [SOLVED] An equivalent circuit for the simple code below

    Thanks, "barry". That works but a comparator needs at least 4 elements and a latch 8 elements. It doesn't work for me as it needs at least 10 elements. I was thinking of sth with less than 10 elements.
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    [SOLVED] An equivalent circuit for the simple code below

    My bad, I forgot to add this part. I think you got my point now. While (Clock) being if ((V(WL)-Vth)>0) VDC=2; else VDC = 0; end Assuming VDC=2, I want it to happen only one time. For example, a capacitor can store the value. The thing is that I don't have ideal elements and I have to use...
  15. V

    [SOLVED] An equivalent circuit for the simple code below

    Thank you very much for the reply. There is only one problem, the output will change every time V(WL)>Vth. But I want it to keep the value. - - - Updated - - - Thanks a lot. Doesn't it change the output for every cycle? I am looking for sth that keep the value after the first time V(WL)>VTH...
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