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PGA460-Q1: Is it necessary to use damping resistor when using decouple time mosfet?

Gabriel Onzi
Prodigy 120 points
Part Number: PGA460-Q1

I've seen in TIs notes that a damping resistor helps monostatic configuration reducing the ringing decay and therefore the blindzone. But it isn't clear if when using decouple time mosfet it is also recommended to use tuning capacitor and dumping resistor. My guess is that it probably is, but it would be nice to be mentioned. There are a few schematic examples of PGA circuit when using time decouple MOSFET, but they dont mention the existence of a damping resistor. Can you please share your thoughts on this?

Best regards,

Gabriel Onzi

  • 0
    TI__Mastermind 21280 points

    Hello Gabriel,

    Thanks for posting to the sensing forum! Regarding the decouple MOSFET and the tuning components, typically our recommendation is to try to see if its possible to achieve your ideal decay time using the passive components first. So the  damping resistor and if you are running a transformer driven implementation then also include the tuning capacitor. If including these components does not help you achieve the blind zone needed in your design then it is time to look into the decoupling FET.

    In most instances, we have found that the passive components are enough to yield the results customers need and they are able to save some money by not purchasing an additional FET or go through the additional steps of adding it to their design.

    I hope this helps, let me know if there are any other questions!

    Best,

    Isaac