ExG Notch Flex Module

ECG ADC buffer with an additional Twin T notch filter

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An advanced version of our ECG ADC Flex Module with additional filtering to remove 50/60Hz noise during indoor use.

Spice sims are available on github.

Any software related will be released under BSD or MIT license. SAAS or cloud based software will be AGPL.

Creative Commons License

  • 200Hz cutoff

    Chris Hamilton08/17/2015 at 16:57 0 comments

    Our 3dB needs moved from 1KHz down to 200Hz according to Plessey. This should minimize the amount of wasted energy in amplification/ADC and reduce overall noise.

  • TSZ124 op amps

    Chris Hamilton08/17/2015 at 16:55 0 comments

    We will be upgrading the op amps on these boards to a much more precise design ST recommends. It should improve performance and not significantly increase cost.

  • Op Amp abuse

    Chris Hamilton08/17/2015 at 16:54 0 comments

    This design heavily utilizes a single op amp to do multiple things. It is two complex filters and a summation amplifier all in one. We may need an additional amplification of the output, if so we will create a new Flex Module that is 2 channels.

  • ExG

    Chris Hamilton08/17/2015 at 16:52 0 comments

    We are calling this module ExG, though it will mostly be used for ECG sensing. The design allows for a variety of biosensing.

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