This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV1811-Q1: About Noise by Push-Pull

Part Number: TLV1811-Q1

Hi team,

I have questions.

Compared to open-drain, does push-pull emit bigger noise because of rapid current sink/source?

Does this topology difference have big impact on circuit design from the aspect of EMI?

Best Regards,

  • During switching, both output transistors might be partially active for a very short time. The resulting current spikes on the power supply must be buffered with a nearby decoupling capacitor.

    The rising and falling edges of the output signal are not any faster than the falling edge of an open-drain output, so there is no difference in this regard.

  • Shoji-san

    Thanks for your post.  This is an excellent question and Clemens has provided a very good response.  In addition to Clemens comments, the demand on the supplies is also impacted by what is connected to the comparator output.  For example, if a capacitive load is connected, the current draw to charge it or discharge it can be significant if no additional series resistance is included.  This is not a problem for our comparators, but it does put more demand on the bypass capacitors to be able to smooth out these burst of current sourcing and sinking.

    Clemens, thanks as always for your continued support of the forum.

    Chuck