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Recent content by dinosaur078

  1. dinosaur078

    reduce ISI in Rx equalizer

    by the way could y explain about "preshoot" , what is it, why is it used in Pcie ? thank y in advance
  2. dinosaur078

    Pre-emphasis and DE-emphasis circuits?

    i think there is a different view of PRESHOOT. this is its definition : " Preshoot is a new feature designed to improve the signal in the following bit time by boosting the voltage in the current bit time" why it can improve signal ? pls
  3. dinosaur078

    Pre-emphasis and DE-emphasis circuits?

    dear sunny ? could you explain more about preshoot in detail ? thanks
  4. dinosaur078

    Pre-emphasis and DE-emphasis circuits?

    Re: pre emphasis and de emphasis dear you all in PCIe gen 3, why do we need preshoot technique ? thank you in advance
  5. dinosaur078

    reduce ISI in Rx equalizer

    thank you for your explaination btw: could you tell me how can calculate equalization coefficient from S-parameter matrix ? thank you in advance
  6. dinosaur078

    reduce ISI in Rx equalizer

    thank zorro for your words can we reduce pre-curors ? and why DFE only can reduce post-cursors? thank you
  7. dinosaur078

    How to measure linearity of differential amplifier in cadence spectre .

    according to razavi book , just focusing on phase margin
  8. dinosaur078

    reduce ISI in Rx equalizer

    Dear every one i do not understand why ? could you please explain ? thank all you in advance
  9. dinosaur078

    precursor (preshoot) in PCIe gen 3, calulation of C-1 C0 C+1

    dear Bro i am investigating the PCIe gen 3, and do not know why this gen use Precursor ? , and when preshoot will be applied to reduce the signal distortion ? how to calculate the values of C0 , C-1 , C+1 ? thank you all in advance
  10. dinosaur078

    The common questions in analog layout

    dear dick_freebird thank you for your helps so much could you explain more clearly about "Why need same length" Matching is most accurate when geometries, internal and close-by, are uniform. Various lithography and proximity-effect offsets are inherent to fabrication and these are taken out by...
  11. dinosaur078

    The common questions in analog layout

    hi there ! i have some questions for analog layout , could anyone can help me to explain or make it insight Why need match Why need same length Why need unit width to replicate Why need dummy Why need shielding Why care parasitic Why need seal ring Why top metal is immune to antenna...
  12. dinosaur078

    figure of merit , VCO

    dear every body i am practicing to simulate VCO using CADENCE, i already known to simulate phase noise, PSS , or how to get current consumption of VCO but i do not how to simulate FOM parameter in cadence could you please guide me or give me some advices to get this parameter in cadence tool...
  13. dinosaur078

    calculate impedence of input

    Dear jeffrey samuel i draw the small signal model and apply the KCL , KVL but i can't find the final equation , could you please help me more clearly
  14. dinosaur078

    calculate impedence of input

    dear everybody i want calculate the input impedance (= Vx/Ix) of this topology , this is 1 problem in prof razavi's book , the requirement is sketch Ix versus Vx , that why i want to obtain equation of the input impedence, could you please help me ? many thanks in advance
  15. dinosaur078

    PEX errors (extract parasitic )

    dear everybody i am running PEX to extract parasitic of my layout . after running PEX completely , there is a error appears , but i do not what is this errors could you pls tell me what is this , in my circuit i do not use device "c" thank you in advance
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