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Recent content by vinogunasekaran

  1. V

    Input rise time of start/stop pulse to the TDC

    ya, why do you expect 1ns rise time? what if rise time is poorer than this? What is setting a limit on this specification?
  2. V

    Input rise time of start/stop pulse to the TDC

    ya, for IC's i can see the datasheets. But I wanted to design a TDC of my own, say a simple vernier delay line TDC. Based on what should I fix the limit of my input rise time 1596200678 yes, how much should it be fast, timing uncertainity i get it.
  3. V

    Input rise time of start/stop pulse to the TDC

    How much should be the input rise time of the start/stop pulse to a TDC? What determines it?
  4. V

    PN and jitter for low frequency oscillators

    Hi, thanks for the reply. Can you elaborate on this, as to why the accuracy will not be good?
  5. V

    PN and jitter for low frequency oscillators

    I wanted to measure jitter (by simulation) for my 10KHz oscillator. Can I run a PN analysis using spectre and integrate it to find jitter? Why there are no Phase noise plots for low frequency oscillators and how are their jitter characterised in general?
  6. V

    Phase noise to jitter conversion

    Hi, I am referring to a thesis from niknejad's group, which uses the following formulae to convert phase noise to frequency uncertainity I tried calculating frequency uncertainty for the same example that was stated in the image. But I could not get the 0.1 ppm answer that he gets. can someone...
  7. V

    [Moved]: TDC IC start and stop

    Re: TDC IC start and stop Yes i understand that it gives the time period between start and stop. But I have only one digital signal as input , whose frequency is to be counted. What will my stop input be? (eg. TDC7200)
  8. V

    [Moved]: TDC IC start and stop

    Hi, I wanted to measure the frequency of a signal using a TDC. Typical TDC's uses a start and stop signal as input. What does that mean and how does that help me in measuring the frequency of my signal
  9. V

    Inductance measurement- Which is better?

    hi i asked which is better of the two (i) LR time constant (ii) resonant frequency, in terms of accuracy. - - - Updated - - - hi smijesh, i asked which is better of the two (i) LR time constant (ii) resonant frequency, in terms of accuracy.
  10. V

    Inductance measurement- Which is better?

    Hi, I have come across unknown inductance measurement by (i) connecting a resistance in series with the inductance, thereby measuring the time constant, from which the inductance value is calculated (ii) By using a resonant circuit, from the resonant frequency. Which way of measuring gives a...
  11. V

    PSRR BAndgap reference

    Hi, I have designed the cascode BGR attached in the fgure. When I connected n AC source and measured the PSRR i get only around -15dB at 1KHZ. pls tell me why i get very low PSRR. - - - Updated - - - Image attached
  12. V

    Current switch and voltage switch

    In a mixer (gilbert cell), whether the diff pairs acts as a current/voltage switch? What are the properties to find out if a mosfet acts as a votage/current switch?
  13. V

    Current switch and voltage switch

    What is the difference between current switch and a voltage switch? How MOSFETs are used as current/Voltage Switch?

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