TUSB1002: VOD Eye diagram question

AJ Cheng

Genius 3615 points

Part Number: TUSB1002

Hello.

We use TUSB1002 for NB application.

After testing the eye diagram, it was found that the adjustment of VOD and EQ was small change in the eye diagram.

Why is there such a phenomenon? Please help us with your suggestion. Thanks~

Layout length

VOD is set to 1. Eye height value and LFPS value and report.

port9-1.pdf

VOD is set to 16. Eye height value and LFPS value report.

port9-16.pdf

over 7 years ago

0 David (ASIC) Liu over 7 years ago

TI__Guru**** 183501 points

AJ

What is the gain of the incoming VID? For best performance, the TUSB1002 should be operated when the gain of the incoming VID is less than or equal to the TUSB1002 linear range.

The eye height is impacted more by the EQ, do you have the same EQ setting for both cases? What is the EQ you are using right now?

Thanks
David

0 AJ Cheng over 7 years ago in reply to David (ASIC) Liu

Genius 3615 points

Dear David.
The EQ setting of both VODs is 16.3 dB. I will confirm the VID to you soon. Thank you for your help~

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TUSB1002: VOD Eye diagram question