JohnLai
Junior Member level 3
Hello, Folks,
An online tutorial (Intel SI Fundamentals Short Course - Equalization) shows an TX Pre-emphasis FIR filter has such frequency response:
The green line in the above figure shows that there is a dip at 6.4GHz for the 6.4Gb/s data transmission. I do not understand why there is such a dip at 6.4GHz since this is exactly what the frequency components are needed for transmitted data. I am also expecting the pre-emphasis should be a high-pass filter like a passive CTLE due to the low-pass characteristics for wireline channels.
Could someone please explain it to me.
Thank you.
An online tutorial (Intel SI Fundamentals Short Course - Equalization) shows an TX Pre-emphasis FIR filter has such frequency response:
The green line in the above figure shows that there is a dip at 6.4GHz for the 6.4Gb/s data transmission. I do not understand why there is such a dip at 6.4GHz since this is exactly what the frequency components are needed for transmitted data. I am also expecting the pre-emphasis should be a high-pass filter like a passive CTLE due to the low-pass characteristics for wireline channels.
Could someone please explain it to me.
Thank you.