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LMH6553: Feedback resistor selection

Shinya Sawamoto
Expert 5285 points
Part Number: LMH6553

Hello team,

The feedback resistor is recommended on the datasheet as below.

In case of increasing it to make a gain higher, what are the main concern and risk?
(I can guess the bandwidth will get lower. Could you advise if there are any critical things.)

Thanks in advance.
S.Sawamoto

 

  • 0
    Guru 48395 points

    Table 1 and 2 on page 21 show fixed Rf vs gain, this does reduce the input R to go to higher gains, 

    If you want to just increase the feedback R to get higher gains that will work but bandlimit through the gain bandwidth product - with a slight change in phase due to the feedback pole to the input C moving down a bit as well - simulations should show all of that approximately. 

  • 0
    Guru 140200 points

    Hi Shinya,

    how much do you want to increase the feedback resistors?

    Kai