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Signal Conditioning Definitions

Shu-Cheng LIN
Guru 11785 points

Hi Sirs,

Sorry to bother you

We are survey and study TI high speed signal conditioning.

Some Definitions are confused for us. 

Could you help to explain more detail for us? 

1. What different between Re-driver/Re-peater?

We saw 

Redriver

Does not touch the data but equalizes and redrives the amplitude

Repeater

Brings data in, performs a certain amount of error correction and retransmit corrected data.

We don't know what are they mean??

2. What different between Buffer and Re-driver?

We saw different at buffer does not compensate for signal loss. But as i know Buffer and Redriver both are Signal Strengthening??

Buffer

Acts like a termination point but does not compensate for signal loss

3. At switch Definitions, what is mean includes cross points and other configurations like 4:2 or 2:4??

Switch

General term that includes MUX and DEMUX but also includes cross points and other configurations like 4:2 or 2:4

4. What different between Pre-emp and De-emp??

We saw Definitions but we don't know what is mean.

Pre-emphasis

A process of increasing the amplitude of certain frequencies relative to others in a signal in order to help them override noise, complemented by de–emphasis before final reproduction of the signal being received. Exceeds the output swing.

De-emphasis

Some times referred to as driver equalizer: A process of reducing the relative amplitude of certain frequencies in a signal that have been exaggerated by pre–emphasis, restoring the signal to its original form. Does not exceed the output swing

Many thanks for your reply.

  • TI__Mastermind 22865 points

    Hello,

    1. As long as a Repeater only has internal EQ and Gain control it has the same functionality as a Re-Driver. Once the Repeater incorporates some type of jitter, X-Talk, and/or Reflection correction it no longer acts as a Re-Driver; these are usually called Retimers. TI considers a Repeater = Re-Driver.

    2. A Re-Driver Equalizes and gain controls a signal coming through it while a Buffer has no additional benefit other than providing a clean signal

    3. Crosspoints, muxes, and demuxes all involve a switch that allows you to select either which input or which output the signal is routed to in the chip. This is an example of a crosspoint diagram:

    4.Pre-Emphasis tends to boost a certain frequency signal (gives energy to high frequency). While De-Emphasis focuses on attenuating an undesirable frequency signal/noise that has been amplified by the Pre-Emphasis process (Remove Energy form Low Frequency).

    I hope this helps,

    Andres Blanco