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ECG_RA and ECG_LA feature input signals: type, amplitude, frequency, (detailed description)

user4763756
Prodigy 30 points
Other Parts Discussed in Thread: TINA-TI, INA826, INA333

In the figure above, in TINA-TI SPICE simulation program, I want to know what type of signal is set to ECG_LA and ECG_RA in the circuitry that corresponding to LA and RA  Electrodes, and are marked in the two corresponding boxes.

Thanks for the help, MariusROSU

  • 0
    TI__Mastermind 25775 points
    Hello MariusROSU,

    The boxes contain the equivalent model for the signals from the left arm (LA) and right arm (RA).
  • 0 in reply to Pete%20Semig
    Prodigy 30 points

    Hello, Good morning Pete Semig,

    I don't think you get the exact meaning of my question, or I have not made it pretty clear; I know that the two rectangles represents equivalent electrical circuit model for LA and RA electrodes, but the essence of the question was what type of signal should be set-up for the two voltage generators, denoted ECG_LA and ECG_RA, such that at the exit denoted Vout (pin 7 of OA INA826), the signal to be relatively close to a real EKG.

    A modified circuit, but with the instrumentation amplifier INA333, is already done by me and tested in real conditions; now I want to determine some characteristics of power consumption through simulations.So I repeat, the goal is not what the rectangles represent, but what kind of signal or function must be set to ECG_LA and ECG_RA.

    Thanks again,

    MR

  • 0 in reply to user4763756
    TI__Mastermind 25775 points

    Hello MR,

    Thank you for the clarification. There is a TINA-TI simulation called ECG_External.TSC in the following forum thread:

    e2e.ti.com/.../117436

    Please download TINA-TI and open the simulation. You can then double-click on the ECGp and ECGn sources. Then click in the Signal section as shown below:


    This will open the following dialogue box which shows the X and Y values of the piecewise linear source as shown below.

  • 0 in reply to Pete%20Semig
    Prodigy 30 points

    Hy, good morning,

    Yes it works, but for my circuit I have to revise some values in the signal lines and maybe of passive components, according with the picture below

    Thanks,

    MR

    Characteristics of the ECG signal_400.tif