4.1 Linear Equalization Effects on Jitter Due to Attenuation

As shown earlier with the ability to recover and reproduce SAS-3 transmit FIR characteristics, this section shows a family of curves from the SAS-3 Transmitter and at the output of the DS125BR820 Linear Equalizer. As the SAS-3 waveform post cursor is stepped up from a minimum value (Light Blue Waveform), the DS125BR820 is able to stay in sync with the SAS-3 transmit waveform characteristics. Like waveform colors on left and right oscilloscope screens show SAS-3 Tx output and equalizer output characteristics for the same condition.

Figure 6. Waveforms at the SAS-3 Tx and After the Linear Equalizer

For this family of waveforms the linear equalizer was placed ~ 5 dB from the SAS-3 Tx. The waveforms taken at the output of the DS125BR820 utilized an equalizer setting of Level 2 (+5dB).