JohnLai
Junior Member level 3
- Joined
- Sep 27, 2008
- Messages
- 25
- Helped
- 0
- Reputation
- 0
- Reaction score
- 0
- Trophy points
- 1,281
- Activity points
- 1,481
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.