The linear driver is used to drive the channel at the correct impedance. The VGA is used to restore the amplitude of the signal. The CTLE is used to equalize the frequency dependent loss experienced in the channel. Allow a chip that has a shorter reach SerDes to support an application that requires a longer reach SerDesĪ typical redriver datapath includes a continuous time linear equalizer (CTLE), a variable gain amplifier (VGA), and a linear driver.Reach the furthest corners of a large PCB.Typical applications for redriver or retimer chips are to: They were advanced in their day and used similar technologies to what are used in today’s high-speed retimers, including equalization, clock-data recovery (CDR), line coding, and framing.įor every serializer/deserializer (SerDes) use case, there is always an additional application that needs enhanced reach. These systems carried multiple channels of voice circuits over a shielded twisted pair with a digital retimer installed every few thousand feet. Digital retimers came to prominence in the 1960s with the emergence of the telecom digital carrier systems: T1 and E1.
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