OPA858DSGEVM: Why does EVM attenuate gained signal using R6,R7,R8 resistors before output?

Hi Myron,

to get a throughput gain of about 1. For easier comparison. Remember, an EVM is an evaluation module helping to confirm the datasheet specifications by performing own measurements. Though, you can easily change the components values to your needs 

Kai

Hi Kai,

Thank you for the reply. Could you explain what you meant by "throughput" gain, and why a default of 1 is desired?

Edit: Spelling

Hi Myron,

I meant "through...put" not "through...out".

The dynamic performance of measuring equipement (slew rate, bandwidth, etc.) often depends on the measuring range. Keeping the input and output signal equally great can ease the comparison as you can omit the costly and degrading attenuator.

Kai

I see, so these resistors are for impedance matching, and getting rid of these resistors would induce signal reflections due to impedance mismatch? 

So the response curves are probably shown with "200" ohm load, this is how it is measured. Your measurements or applications need to adapt to your specific needs.