raymond_luo2003
Member level 1
serdes pre-emphasis equalizer
Dear all,
I am working on the high speed SerDes design. I got some papers which mention about using the pre-emphasis and post-equalizer to improve the eyediagram at receiver side which is attenuated by cable loss.
Altough that makes sense to use those types of techique, I feel it is quite challenging to implement it.
a) Usually we require the one original serialized data stream and one (or more than one, depends the FIR structure) very short precised delayed serialized data stream with coefficient a to bulid FIR. I just wonder how to implement the precise delay line under PVT variation?
b) Another methodology is to delay parallel data before the serializer which let us use the low frequency clock for easy implementation. The issue of this is we have to duplicate an entire serializer only for generatiing the delayed serialzed data stream. It is big area and power copnsumption!
Anyone got relevant rexperience would help me a lot!!
Thanks
Raymond
Dear all,
I am working on the high speed SerDes design. I got some papers which mention about using the pre-emphasis and post-equalizer to improve the eyediagram at receiver side which is attenuated by cable loss.
Altough that makes sense to use those types of techique, I feel it is quite challenging to implement it.
a) Usually we require the one original serialized data stream and one (or more than one, depends the FIR structure) very short precised delayed serialized data stream with coefficient a to bulid FIR. I just wonder how to implement the precise delay line under PVT variation?
b) Another methodology is to delay parallel data before the serializer which let us use the low frequency clock for easy implementation. The issue of this is we have to duplicate an entire serializer only for generatiing the delayed serialzed data stream. It is big area and power copnsumption!
Anyone got relevant rexperience would help me a lot!!
Thanks
Raymond