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.
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
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.
Mass