Arria® 10 Transceiver PHY User Guide

ID 683617
Date 4/01/2024
Document Table of Contents Variable Gain Amplifier (VGA)

Arria® 10 channels have a variable gain amplifier to optimize the signal amplitude prior to the CDR sampling. VGA can only be operated in manual mode. VGA gain can be selected through Quartus® Prime Assignment Editor or Quartus® Prime Setting File (qsf) or the Avalon® memory-mapped interface register. You must set VGA manually for all combinations of CTLE and DFE modes.

Figure 230.  VGA Frequency Response for Different Gain Settings