OPA333: non-inverting summing amplifier design

Brian Chan

Expert 6530 points

Part Number: OPA333

Tool/software:

Hi Team

could you help me check below non-inverting summing amplifier is available for you?

or do you have any other recommendation solution for this applcation.

BRs

Brian

2 months ago

0 Marek Lis 2 months ago

TI__Guru 67601 points

The circuit looks fine. However, I'm not sure the reason behind 750 ohm resistors to ground. The only thing I would add is the feedback capacitor matching the common-mode input capacitance of OPA333 - see below.

0 Brian Chan 2 months ago in reply to Marek Lis

TI__Expert 6530 points

Hi Marek

because IMON will provide a constant current source so they need a resistor to produce voltage for AMP reference.

do you think the application is ok for you ?

appreciate your great support:)

BRs

Brian

0 Marek Lis 2 months ago in reply to Brian Chan

TI__Guru 67601 points

Hi Marek

because IMON will provide a constant current source so they need a resistor to produce voltage for AMP reference.

do you think the application is ok for you ?

appreciate your great support:)

BRs

Brian

+1 Marek Lis 2 months ago in reply to Marek Lis

TI__Guru 67601 points

The circuit looks fine. Just make sure in your calculation you account for the fact that some of the difference between PSU1 and PSU2 currents would flow thru two 10k resistors. That’s what makes it a summing amplifier.

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OPA333: non-inverting summing amplifier design