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ADS1298ECGFE-PDK: Hardware Pace using Slope Detection

Om Singh
Prodigy 10 points

Part Number: ADS1298ECGFE-PDK
Other Parts Discussed in Thread: ADS1298

Tool/software:

Dear Team,

I am working on one of the project and as part of the project, I am working on detection of pace using hardware pace detection, and ADS1298 performance demonstration kit. I am taking the output (paceout1) from ADS1298 and connecting as an input to hardware pace detection at vpace. giving supply as Vcc-3.3V with common ground. I am getting the following result at the differentiator with function generator at 300us and voltage 200mV:

 

However, when I am connecting an input from simulator with 0.1ms and 5mV, I am unable to see the output at any point like differentiation, comparator, and latch. any advise.

Many thanks  

  • 0
    TI__Guru 69086 points

    Hello Om,

    Welcome to our forum and thank you for your post.

    If I understand correctly, you are implementing a discrete window comparator circuit for hardware pace detection? Have you had a chance to review our application note about this topic? https://www.ti.com/lit/ug/slau511/slau511.pdf.

    You may need to adjust the passive component values in your differentiator circuit to sense smaller pace pulses with only 100µs pulse width and lower amplitude. 

    Regards,

    Ryan

  • 0 in reply to Ryan Andrews
    Prodigy 10 points

    Hi Ryan, Thank you so much for the quick one, it is useful to know, FYI on technical note, I am closely following the notes and setting-up the hardware accordingly, also I want to highlight here that I have tried with higher voltage as given in technical datasheet with 5V, without simulator I am getting couple pulses for given pulse duration from function generator at the differentiator output as you can see in image:

       

    However with simulator, I am unable to see anything at differentiator which is strange? I was wondering if anything to set-up in software end of development o board (i.e., ADS1298ECGFE-PDE).

    Any advice will be highly appreciated.

    Many thanks,

    Om

  • 0 in reply to Om Singh
    TI__Guru 69086 points

    Hello Om,

    Where are you applying the function generator or patient simulator input signals? Are they connecting to one of the ADS1298 input channels and routing through the PACE_OUT pins? If so, you will need to review the PACE amplifier register settings to ensure you have selected the appropriate channel. There will be some attenuation of the input signal as the overall gain will be PGA gain x PACE amplifier gain (0.4 V/V).

    Regards,

    Ryan