Other Parts Discussed in Thread: TUSB522P
Dear Team,
Please see my customer's question below :
I have integrated 2 SN65LVPE512 TI USB 3.0 re-drivers in my design as depicted in the picture below.
In order to optimize the configuration of the EQ, OS and DE I inject from BERT tester 5 Gbps, PRBS 11 signal in one side and check the eye diagram in the other side.
The amplitude of the differential signal is 1000 mVp-p.
I change the relevant EQ, OS and DE in both the re-drivers (A and B) until I receive the best eye diagram.
When I replace the HOST and I inject the PRBS signal to re-driver A, so when EQ1 is changed from NC ( 0 dB) to GND ( 7 dB) I see jitter reduction in the eye as I expect but when I change EQ1 to VCC (15 dB) the eye is completely ruined and closes.
Why is that ? Why there is no additional improvement in the eye when the EQ is set to 15 dB and why the eye is ruined in this case ?
Best regards,
Nir.
