Hi, this videos is really nice way to know how only FFE is not enough for equalizing bad channel. The waveform after channel for a 30dB loss channel, is one of the most simplest way to explain. Really appreciate your presentation skills. Thanks a lot
Hi, very useful video ! One question: if I have a 3-tap FFE with c0=0, c1=0.51, c2=-0.49 then it seems that de-emphasis level is 20*Log[20/1000] = -34dB. So theoretically it is possible to construct a 3-tap TXFFE with de-emphasis level
@Hrachya Khachatryan Thanks for the good de-emphasis question. Correct. Ideally, if you only check the loss value at the Nyquist rate, the 3-tap FFE can construct whatever loss you want. But, only 3-tap FFE might not generate the inverse response of the channel loss properly; therefore, the residual ISI would be big. In addition, as you said, the 20mv is too small to be opened with the crosstalk, reflection, and noise under a big residual ISI!
Hi, Excellent videos. Please post more videos Rx detection, resistor calibration, slicer calibration, CDR loops and IQ calibration
Thanks for the feedback. I will try my best to make those circuit images for you :)
Hi, this videos is really nice way to know how only FFE is not enough for equalizing bad channel. The waveform after channel for a 30dB loss channel, is one of the most simplest way to explain. Really appreciate your presentation skills. Thanks a lot
Thanks for the feedback and you're very welcome. I'm glad that helped you.
Thank you Teacher!
Hi Zan, You're very welcome. 😀
Hi Professor
I am so lucky to watch your excellent video.
Do you have video for receiver FFE?
@Jeffery Yellow thanks for the suggestion. We don't, but I plan to make the RX FFE and will keep you posted soon :)
Hi, very useful video !
One question: if I have a 3-tap FFE with c0=0, c1=0.51, c2=-0.49 then it seems that de-emphasis level is 20*Log[20/1000] = -34dB. So theoretically it is possible to construct a 3-tap TXFFE with de-emphasis level
@Hrachya Khachatryan Thanks for the good de-emphasis question. Correct. Ideally, if you only check the loss value at the Nyquist rate, the 3-tap FFE can construct whatever loss you want. But, only 3-tap FFE might not generate the inverse response of the channel loss properly; therefore, the residual ISI would be big. In addition, as you said, the 20mv is too small to be opened with the crosstalk, reflection, and noise under a big
residual ISI!
@@circuitimage Thanks for reply ))
@@hrachya_khachatryan You're very welcome :)