BUF802: Pros/cons of composite loop using BF mode

alexandre maurel

Part Number: BUF802

Hi,

In the datasheet you describe on Figure 8-11 (doc SBOS998c-june21) a Composite Loop using BF mode configuration. May you descibe more the pro/con of this solution regarding the composite loop mode configuration ?

Regards

over 1 year ago

0 Anant Sinha over 1 year ago

TI__Intellectual 1550 points

HI Alexandre,

Are you interested in any particular parameter for the performance comparision in the two configurations?

Regards

Anant

0 alexandre maurel over 1 year ago in reply to Anant Sinha

Prodigy 90 points

Hi Anant,

Not yet as i'm first trying to understand why you present this configuration as you have quit the same bill of material as the composite loop without using most of it's internal design purpose (auxiliary path). FYI The use case is an active probe voltage so low noise/high bandwidth are the primary purpose

0 Anant Sinha over 1 year ago in reply to alexandre maurel

TI__Intellectual 1550 points

Hi Alexandre,

Thanks for letting us know the use case.

Give us couple of days, I will share the advantages and disadvatages of using the BUF802 in the two configurations

Regards

Anant

0 Anant Sinha over 1 year ago in reply to Anant Sinha

TI__Intellectual 1550 points

Hi Alexandra,

The main advantage of using the BUF802 in CL mode using the the auxiliary input over the other configuration is that it provides much better flatness over the frequency range specially at the crossover range of HF and LF path.

Regards

Anant

0 alexandre maurel over 1 year ago

Prodigy 90 points

So there is no real interest of having the "composite loop using BF Mode" of figure 8-11 instead of the "composite loop mode" fig. 8-12 ?

+1 Anant Sinha over 1 year ago in reply to alexandre maurel

TI__Intellectual 1550 points

Alexandra,

Yes that is true, to eliminate the limitaion of the "composite loop using BF Mode" which can be realised using any single input buffer, we recommend to use the BUF802 in composite loop where the high freq signal and low freq signal have different input paths (IN and In_Aux) for better performance.

Regards

Anant

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BUF802: Pros/cons of composite loop using BF mode