Hi Enson, thanks for your good question. You're correct: the sampler's decision is made by the input differential inputs, not the single-ended signal. I might have caused the confusion in my video. Could you please point me out where I made the confusion in my video? Thanks again for your feedback. CC
@@circuitimagethanks for the reply In 2:50 I was wondering if the differential signal is connected to the sampler than why DC offset will reduce the decision margin
@@ensonb9328Hi Enson, thanks for pointing it out clearly. You're correct. It's the differential signal, so the decision margin would be the swing related to the 0V. But, if the offset of the differential signal would make the differential decision threshold not 0V anymore. Instead, the differential decision threshold would be the VOS, and the DC offset ,VOS, will reduce the differential decision margin with the same differential swing. Thanks again for your feedback. I hope it's more clear to you now. :) CC
@@ensonb9328 Hi Enson, Apologies for the delayed response. I thought I had replied but realized it didn’t go through properly. To clarify, the differential signal is connected to the sampler, with the ground (0V) serving as the reference for the corresponding differential signal. However, the DC offset shifts the reference decision point to be either above or below 0V. When the differential signal falls above this adjusted reference, the decision margin decreases accordingly. Does that make sense? Thanks, CC
It's good video for me . thanks you. professor, Can e-mail contact you to discuss about Serdes design thanks. Where are you from? I hope to know the teacher.
Very nice and simple video showing BER relationship to DC offset of amplifier. Thank you very much.
Glad you liked it!
您好 這邊有一個疑問是
當sampler在決策的時候不是應該看輸入兩端的電壓差來決定0或1嗎
不太理解為什麼是單端的threshold來決定輸出邏輯
Hi Enson, thanks for your good question.
You're correct: the sampler's decision is made by the input differential inputs, not the single-ended signal. I might have caused the confusion in my video. Could you please point me out where I made the confusion in my video?
Thanks again for your feedback.
CC
@@circuitimagethanks for the reply
In 2:50 I was wondering if the differential signal is connected to the sampler than why DC offset will reduce the decision margin
@@ensonb9328Hi Enson, thanks for pointing it out clearly.
You're correct. It's the differential signal, so the decision margin would be the swing related to the 0V. But, if the offset of the differential signal would make the differential decision threshold not 0V anymore. Instead, the differential decision threshold would be the VOS, and the DC offset ,VOS, will reduce the differential decision margin with the same differential swing.
Thanks again for your feedback. I hope it's more clear to you now. :)
CC
@@ensonb9328 Hi Enson,
Apologies for the delayed response. I thought I had replied but realized it didn’t go through properly.
To clarify, the differential signal is connected to the sampler, with the ground (0V) serving as the reference for the corresponding differential signal. However, the DC offset shifts the reference decision point to be either above or below 0V. When the differential signal falls above this adjusted reference, the decision margin decreases accordingly.
Does that make sense?
Thanks,
CC
sincere thanks
Hi Ronald, You're very welcome :)
Thankyou
You’re welcome 😊
It's good video for me . thanks you. professor, Can e-mail contact you to discuss about Serdes design thanks.
Where are you from? I hope to know the teacher.
Sure. Feel free to send me an email. I'm in Atlanta, GA, USA.
Thankyou
You’re welcome 😊