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Recent content by salehkhan

  1. salehkhan

    calculation the delay time of symmetric load delay cell

    The resistors are not necessarily linear, actually, I meant that solving the above circuit can help you have an idea about your own circuit. Becoming curious I found this paper: "Low-Jitter Process-Independent DLL and PLL Based on Self-Biased Techniques" by John G. Maneatis That's all you...
  2. salehkhan

    calculation the delay time of symmetric load delay cell

    Start by making some simplifying assumptions. Your circuit can be modeled as the following picture: Assume that for a long time before t=0: Vin+=0 and Vin-=Vdd and after t=0: Vin+=Vdd and Vin-=0 Then continue writing equations and determine what happens for (Vout2-Vout1). I can't help further...
  3. salehkhan

    calculation the delay time of symmetric load delay cell

    Delay time by the definition is the time between when the input crosses its 50% of final value and when the output crosses its 50% of final value. In order to calculate (or simulate) the delay time, a step input should be put in the input and calculate (or measure) the time between two mentioned...
  4. salehkhan

    Timer 555 Flip-Flop Working Explanation

    The product of RC(=220n*220K=48.4ms) introduces a time constat, by which "leftsideofswitch" approaches toward node3. It means that "leftsideofswitch" would not reach node3 immediately. I think that this RC path acts as a debouncer. You can search for the concept of "contact bounce". So, when...
  5. salehkhan

    Timer 555 Flip-Flop Working Explanation

    This circuit toggles the output every time that the switch is pushed. when the switch is off then node2,6=3v it means that output holds its previous state. The out put can be '1' or '0'. Let's consider the first case which means: node3=6v then leftsideofswitch=6v, as the switch is pushed...
  6. salehkhan

    need help in division of polynomials

    It's impossible. Because there is one equation and two unknowns. You should have another equation to find rho independent of m.
  7. salehkhan

    Signal flow graph for two-port network

    Hi The solution could be find here. The rules which are used are explained here.
  8. salehkhan

    Overdrive voltage understanding

    Hi I can't remember where it was mentioned. However, it could be seen from another point of view: As in saturation region VOD=sqrt(2*ID/Un*Cox*(W/L)) so, for a given current, VOD is dependent of W/L ratio. We can discuss more if you say the page where you are referring.
  9. salehkhan

    Stubs in the electronics or microwave

    You can take a look at the book "Microwave Engineering" by Pozar. There is a brief introduction for stubs in chapter 5 under the title "single stub tuning". They can be categorized into 1.Shunt and 2.Series stubs and from another point of view there are 1.Open and 2.Shorted stubs. Actually this...

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