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  1. A

    Bulk current injection - Resonant frequency of ESD protection diode CAN bus

    https://www.onsemi.com/pub/Collateral/AND8253-D.PDF I was going through an application note by On Semi, System Level Surge Suppression Solutions for the CAN Bus -AND8253/D, where it says that the TVS diode's resonant frequency can be a design issue for high frequency EMI tests like BCI and...
  2. A

    Capacitor in the circuit - Bypass capacitor

    I was trying to measure the supply current of a CAN transceiver during fault conditions, one thing which I noticed was that during CANH to GND(when the current consumption is supposed to be the highest), the current was kind of like a sine wave and going negative during '1' bit...
  3. A

    Common mode choke parameters and split termination concept

    Low impedance for differential mode at 250kHz, right ? May I please know what you mean when you say "unless it were really bad". Could you please tell me what this parameter is and how should I consider it's impact in my application ?
  4. A

    Common mode choke parameters and split termination concept

    1)I am trying to the understand the important parameters of a common mode choke that will be placed at the CANL and CANH lines of a transceiver.First parameter - Impedance as function of frequency - I'm looking up the impedance value at 500kHz in the graph, since my application data rate is...
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    CAN transceiver interfacing to uC- resistors on RXD ,TXD lines

    could someone please tell me why series resistors are used on the TXD, RXD lines of a CAN transceiver while interfacing it with a microcontroller. I've read a few application notes where they suggest not using the series resistors since they would cause some delay, but a few others suggest using...
  6. A

    Short

    Hi, I have a scenario where one end of the resistor in my circuit has 45V and the other end is short to Ground , the 45V end also dips drastically, but not fully to zero , why is this happening , there's also a capacitor involved , is the capacitor trying to avoid the change in voltage.
  7. A

    Upper frequency limit of an oscillator

    Hi, I tried the values that you have mentioned in Ltspice. I'm not getting any oscillations, the output is a constant 0.7 V. The transistor that I'm using is BC846B.
  8. A

    Upper frequency limit of an oscillator

    Actually I think my calculations are okay for now , but since both the sides are balanced , as soon as I start up , I am not getting oscillations in the simulation for a certain microseconds and then it starts oscillating. I just want to know how to calculate the base resistor value so that one...
  9. A

    Upper frequency limit of an oscillator

    Yes
  10. A

    Upper frequency limit of an oscillator

    General astable multivibrator connections
  11. A

    Upper frequency limit of an oscillator

    Yeah , the connections are right.
  12. A

    Upper frequency limit of an oscillator

    BC846B- NPN general purpose transistor. How do I determine if a certain transistor is suitable or not for 300kHz operation.
  13. A

    Upper frequency limit of an oscillator

    But why assume gain as 100 ? And when I increase the collector resistor values , it doesn't work , no oscillation. If I increase Rc, Ic would decrease , in-turn Ib would decrease and hence the transistor stops switching on. This was my reasoning. Could you please explain where I'm wrong.
  14. A

    Upper frequency limit of an oscillator

    Take a look at my calculation
  15. A

    Upper frequency limit of an oscillator

    If I decrease the resistance, there's no oscillation
  16. A

    Upper frequency limit of an oscillator

    Take a look at my circuit and calculation below, if I reduce the resistance, I can't get the oscillations. I also simulated the above circuit with the same component values in LTspice, it works.
  17. A

    Upper frequency limit of an oscillator

    I want to achieve around 300kHz, but for the above values there are no oscillations, for 150k , I'm getting about 180khz.
  18. A

    Upper frequency limit of an oscillator

    I have an astable multivibrator circuit , which operates as expected only upto a certain frequency. To increase the oscillation frequency, if I increase the base resistors or decrease the capacitors , the oscillation completely stops. What could be the reason ? How do I go about analysing what...
  19. A

    Op amp Vcm

    No , the VCm is 0 to 4.1V . I would like to know what exactly happens if we give a higher input.
  20. A

    Op amp Vcm

    Hi , I'm reading about op-amp and I have a doubt regarding the Vcm of the op-amp , what happens when the input exceeds the Vcm? In my application, I'm using the op-amp as a buffer , (LMV722Q) I would like to understand how the input and output would behave if the input voltage exceeds Vcm ...
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