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LMV824-N: Opamp configuration

MIT SHAH
Intellectual 715 points
Part Number: LMV824-N

Hello,

I am new to analog electronics,i am confused that which opamp configuration is used in shown image,

Please guide me about it.

Kind regards,

Mit shah

  • 0
    Guru 140200 points
    Hi Mit,

    when you remove the "DNP" parts the circuit makes sense...

    Kai
  • 0
    TI__Guru*** 140136 points
    Mit-shah

    I suggest drawing this circuit on paper leaving out the DNP components. U9D is non-inverting (6.9 gain) for PWR signal and inverting (5.9 gain) for R66 signal. Q9 can force output of U9D stage to ground. so it chops the signal; DC to unipolar amplitude modulated. U9A is inverting , 0.325 gain and voltage on IN+ sets the offset voltage.
  • 0 in reply to Ron Michallick
    Intellectual 715 points
    Hello Ron,

    Thank you very much for explanation.

    Do you mean about it is PWM unipolar modulation circuit by "DC to amplitude modulated".

    Again appreciate the efforts time you given.

    Kindly let me know if more information about the schematic is required.
  • 0 in reply to MIT SHAH
    TI__Guru*** 140136 points
    Mit Shah,

    The duty cycle of the "DUTYCLCLE" input signal sets the duty cycle of the output signal.
    The frequncy of the "DUTYCLCLE" input signal sets the frequency of the output signal.
    The VOH of the output signal should be 86% of Vref voltage.
    The VOL of the output signal is variable based on the first op amp voltage.