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Driving capcitive loads with LMH6629

Mass Garp
Prodigy 210 points


Hi

I have an application that uses LMH6629 as active filter. It should drive a capacitive load, about 100pF. As far as I see on the datasheet there aren't recomendations about driving capacitive load, except a picture in which a parallel resistor RL is introduced. How must I behave in this case?  Should I put this parallel resistor or is it better to provide as theory says, a series resistor?

Thanks.

  • 0
    TI__Mastermind 22825 points

    Hi Mass,

    I posted a reply to this yesterday:

    http://e2e.ti.com/support/amplifiers/precision_amplifiers/f/14/p/197516/706191.aspx#706191

    It won't be necessary to have a resistor in parallel with the cap load for stability. However, the resistive loading slightly alters the open loop gain / phase response of the amplifier. So, your bench testing, under actual load, is the "last word" due to the many factors that affect stability.

    Regards,

    Hooman

  • 0 in reply to Hooman Hashemi
    Prodigy 210 points

    Dear Hooman,

    Thank you for your time. I've not seen the former answer so I opened a new post. My simulation on TINA software shows that it's better in my application to put that parallel resistor. But, as you told me, the "last word" is spoken by the actual load.

    Regards,

    Mass