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Recent content by yikwon

  1. Y

    Why the results are different between using cadence ADC and using matlab?

    I designed the SD-ADC. I have a good results using MatLab after I extract the output from cadence. But, when I analyze the results using ADE in cadence, the spectrum is different from MatLab results as below. Do you know why this results is presented? Thanks,
  2. Y

    How to make the summing circuit in sigma delta ADC ?

    I designed sigma delta ADC using gm-cell integrator. I've done already loop filter but I couldn't make the summing circuit. In the first time, I used adder using opamp but it's not suitable because gm-cell has a big in/out impedance, so i have to use more than 3Mohm resistor. it's nonsens in IC...
  3. Y

    what is difference between OTA and OP-amp?

    ota opamp I think they are same architecture. why different name?
  4. Y

    does this constant voltage reference work properly?

    you can find this annotation function in ADE (Analog Design Enviroment) just select as below * ADE -> Results> Annotate > DC operating points what does that mean "area device can work" ? thank you. Added after 6 minutes: as you see NMOS (M219, M218), vgs=623mV, vth=695mV...
  5. Y

    does this constant voltage reference work properly?

    thank you for your reply. I mean NMOS is in triode region. as you see, vgs=623mV, vth=695mV therefore vgs-vth <0. is this wrong? Added after 3 minutes: thank you for your reply. this circuit can be generated constant voltage. Of cause, there are differential amplifier after this circut...
  6. Y

    does this constant voltage reference work properly?

    I need a voltage reference(1.5V). so, i designed reference circuit. (*refer to attached file) I'm wondering that this circuit is right operation or not. because vdsat is about 55mV but (vgs-vth) is -50mV so i think this Transistor is in triode region. therefore in my opnion, this circuit is not...
  7. Y

    how to make the ideal CMFB circuit?

    thank you so much. I solve the problems from your advice. thank you. :D
  8. Y

    how to make the ideal CMFB circuit?

    refer to attached file. that is our opamp architecture. The ideal CMFB circuit i made don't have any mistake? if we use that kind of ideal CMFB circuit, the opamp with ideal CMFB have to work corretly. right? thank you.
  9. Y

    how to make the ideal CMFB circuit?

    yes, common mode voltage is 0.9V because i use TSMC0.18 process. that is wrong? i'm a beginner in analog circuit design. need your help.
  10. Y

    how to make the ideal CMFB circuit?

    thank you for your advidce. I've already read that document. so, i tried to make ideal CMFB refering to the document you said. but, i had the strange results. *pls, refer to attached file. compared with opamp using real CMFB circuit, characteristics of the real CMFB is better. i don't...
  11. Y

    how to make the ideal CMFB circuit?

    I tried to make ideal CMFB circuit using VCVS but , it's not correct operation. so, could you show me the ideal CMFB circuit?
  12. Y

    how to make the ideal CMFB circuit?

    I want to know making the ideal CMFB circuit. I saw that ideal CMFB circuit is made using netlist code in some books as below. >> ecmfb vcmfb vss poly(4) vb1 o vcmref 0 vop 0 von 0 0 1 -1 0.5 0.5 Can I make the ideal CMFB using VCVS? please answer about that.
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