Hi,
Our customer would like to connect a feedback resistor (RF1, RF2 of datasheet P.14,Figure23) value of 5 kΩ.
Is there a limit to the resistance value?
RG1 and RG2 are 500Ω.
Best regards,
Yuto Sakai
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Hi,
Our customer would like to connect a feedback resistor (RF1, RF2 of datasheet P.14,Figure23) value of 5 kΩ.
Is there a limit to the resistance value?
RG1 and RG2 are 500Ω.
Best regards,
Yuto Sakai
Hello Yuto,
While there is no limit, note that increasing the feedback resistances will have an effect on the bandwidth and noise performance of your circuit. I would recommend simulating to ensure it still meets your requirements.
Best,
Hasan Babiker
Well at that higher gain of 10V/V will probably be ok for feedback pole due to input C effect, keep in mind
It will be relatively low BW - the TINA model shows 203MHz GBP so your NG=11 case here will be about 19MHz closed loop F-3dB,
Here is that Aol test setup , and that file below so you can get the LMH6551 model (the one I have is 2007, not sure if there is an update)
And incidentally, I notice the Aol model does not seem to show a higher pole (phase just sits at 90deg, should pull down at some higher F) which is almost certainly there physically, makes low gain sims a bit suspect