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Recent content by pedroromanvr

  1. P

    how to calculate the Resistance of M1 & M2 in saturation mode ?

    Hi Venkat: No, in the datasheet the \[{V }_{ GS}\] may vary from 2V to 4V. But that is the case when \[{V }_{ GS} = {V }_{ DS}\], check always for the test conditions. By the way, I got the information using Fig 1 and Fig 3 from the datasheet. As you can see, for a \[{V }_{ DS}=10V\], the...
  2. P

    A simple Verilog question about rising edge of a signal

    Can you explain it more? Do you want to set a signal using two clocks?
  3. P

    [Moved] communication between two simulators

    Re: communication between two simulators Yes, it is possible. I've used it sometimes to simulate a server and client. Here is a video with good explanation. https://www.youtube.com/watch?v=dkAbPzzn2K4
  4. P

    how to calculate the Resistance of M1 & M2 in saturation mode ?

    Saturation is the mode in the MOSFET where it is fully operational conducting (non-linear mode or amplifying mode). Based on that, the circuit you are presenting is a double MOSFET in mirror mode (Current in M1 is approx the same current that in M2 supposing that M1 and M2 are almost identical...
  5. P

    latch warnings during synthesis of verilog code

    Could't see the definition of fsm_NEXT_STATE_5, but for the other two (fsm_enable_misr_2 and fsm_enable_lfsr_3), you are forcing a constant value, which is implemented using latches. A workaround can be to make the synthetizer to use Flip-flops, so instead of having if((fsm_reset) &&...
  6. P

    Interview question doubt-I

    These circuit uses current mirrors. Yes the dominant pole is obtained from the R-C circuit, the gain is about R/(RCs + 1).
  7. P

    shell scripting or perl scripting

    It depends a lot on what you will do. I am nos aware of VLSI scripting languages needs. Personally I prefer perl, it is multi-plataform and you can find a lot of information as well as libraries.
  8. P

    fingerprint minutiae matching

    There are many APIs and modules out there, have you tried with something?
  9. P

    Getting Latin ASCII values through RS232

    You can treat the chars as numbers and add an enum with the values you will use.
  10. P

    send string of characters to uart in a particular format

    What do you have until now? Using UART you can send one byte at a time, so you can divide this problem in stages.
  11. P

    how plc generates the analog signal (speed signal) to the VFD ?

    Do you mean the input of the VFD? Normally, VFDs have serial inputs (BUS, RS-485, PPI, etc). So you can configure the PLC to send a value that would represent the speed of the motor at a given time (as well as many other things). The VFD does all the job (initialization, startup, run, stop)...
  12. P

    Interfacing Stepper Motor with LPC 1343

    As far as I can see, the problem is in your code. In your while loop you are writing to LPC_GPIO2 a 6, then a 3, then a 9 and then a 0x0C. After that you wait for 100 ms and do the same over and over. The correct logic would be, write a 6, delay, write a 3, delay, write a 9, delay and so on...
  13. P

    Help me with this assembly language exercise

    Which programming language are you using? Can you write what you really have?
  14. P

    Interfacing Stepper Motor with LPC 1343

    How are you connecting the motor to the microcontroller?. What is the motor doing (moving erratically or just stopped)? Can you upload a schematic of what you are doing? For what I can see in the code, you are not doing anything (writing 0xC to the port and then wait) you may want to try this...
  15. P

    Stepper motor drive circuit design

    The drop voltage in a FET transistor is around 0.7Vdc. If you use a Darlington pair the drop will be around 1.4Vdc, so I think this will be perfect for what you try to do.

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