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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

    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...
  4. A

    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...
  5. 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.
  6. 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...
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    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 ...
  8. A

    Current measurement circuit , Shunt resistor value Selection

    We want to measure current in the range 1 to 40 uA , and a 100kohm shunt resistor is being used to convert the current into voltage to be fed into the microcontroller. I'm trying to understand why they have selected R1 to be 100kohm , since the lowest voltage reading will be 0.1 and highest 4V...
  9. A

    Multivibrator of varying frequency

    Below I have the circuit of an astable multivibrator with variable frequency, this is just an example , I have not yet decided on the resistor and capacitor values. Can anyone explain how the capacitors are being charged and discharged and in turn how the frequency is changing. The voltage vmid...
  10. A

    Pnp bjt

    In my application, I've used a digital transistor as shown below , but I'm analysing for a case when the Vc of the pnp is more than the Ve and Vb , that is when current flows from collector to emitter in the pnp. What mode of Operation is this ? And how does it impact my circuit which needs a...
  11. A

    Op-amp buffer

    The below circuit is a current measurement circuit , the mosfet is always on in my application and the volatge across the shunt 100k is measured and given to ADC pin of uC.cananyone explain the function of the Opamp as voltage follower in the circuit ? What would happen if the opamp wasn't...
  12. A

    Zener diode and transistor

    This is an over voltage protection circuit , the resistor R706 is connected to the input of a high side driver , 10F and 11H are the signals from and to the microcontroller, UVP is the point where over voltage occurs , can anyone explain the operation of the circuit?
  13. A

    Reverse battery protection Diode

    Hi , I have an application circuit in which the Schottky diode is connected as below to a LDO and is used for reverse battery protection. How is the diode reverse biased when reverse battery is applied taking LDO into account , can anyone please explain .thank you.
  14. A

    Digital transistor for switching application

    I found the below schematic in the application note of On semi. Can anyone please explain why two transistors are used , why is the npn transistor used to control the switching of the pnp transistor ? Why not use a single transistor ? Please help.
  15. A

    NPN/PNP double Resistor-Equipped Transistors (RET)

    Example- PUMD2. Why are such transistors used for switching ?
  16. A

    Current measurement circuit

    The below circuit is a current measurement circuit , the mosfet is always on in my application and the volatge across the shunt 100k is measured and given to ADC pin of uC.can anyone explain the function of the Opamp as voltage follower in the circuit ? What would happen if the opamp wasn't...
  17. A

    Understanding A Datasheet

    http://assets.nexperia.com/documents/data-sheet/PEMD2_PIMD2_PUMD2.pdf Can anyone help me understand a datasheet? In page 7 of the datasheet above , the characteristics have been given.Each parameter has a certain condition associated with it. What significance does this condition hold when I'm...
  18. A

    Transistor Analysis

    Hi, can anyone help me with the circuit given below. what's the "voltage at this point" when the transistor is in saturation ? Is it Vce(sat) from the data sheet of the respective transistor ? and I also know the gain (hfe), so how do I calculate the collector current of the transistor when it...
  19. A

    Analog Circuit Outputs

    an analog circuit's output is given to an ADC pin of the microcontroller , does the current flow to the pin too ? I have some very fundamental doubts, It would be a great help if anyone can clear it ? Thank you.
  20. A

    Power Dissipation Across A Transistor In Cutoff

    what's the Vce across a pnp common base transistor operating in cutoff , denoted as in the datasheet ?
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