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What is difference between pre-emphasis and PR response? (Read 2641 times)
neoflash
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What is difference between pre-emphasis and PR response?
Sep 13th, 2011, 3:04pm
 
They all appears to be a Tx side FIR filter. What is their difference? Can I say that Tx pre-emphasis is a kind of PR response pre-coder?
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loose-electron
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Re: What is difference between pre-emphasis and PR response?
Reply #1 - Sep 14th, 2011, 12:16pm
 
Pre-emphasis is spectral shaping at the tx to compensate for the spectral shape (LPF sort of) of the comm channel.

In SerDes, that can be seen in the time domain, by amplitude boosting the transient edges of the signal.

PR = partial response - usually means bandwidth limiting the receiver input to reduce noise content. However, that also means reducing the higher harmonic content of a signal, thus the term "partial" response.
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