公开(公告)号：US10523251B1

公开(公告)日：2019-12-31

申请号：US16156294

申请日：2018-10-10

Applicant: SILICON LABORATORIES INC.

Inventor： Abdulkerim L. Coban ,  Emmanuel Gautier ,  Fabrice Portier ,  Pascal Blouin ,  Wenhuan Yu

IPC: H04B1/10 ,  H04L25/08 ,  H04B17/336 ,  H03F3/19 ,  H03G3/30 ,  H04L25/03

Abstract: A communications receiver with improved blocker performance including multiple gain tables selected based on a number of reductions or back offs from a maximum coarse gain setting. A receiver chain with multiple gain stages converts a received signal to a digital format, determines the power level of the received signal, and provides an overload indication. A first gain table maximizes SNR and SNDR for weak blockers and at least one additional gain table successively improves SNDR for stronger blockers. An AGC circuit initially sets the coarse gain setting to maximum, and backs off a number of coarse gain steps until the receiver chain is not overloaded. The number of back off steps is used to select a gain table, the power level is used to select an entry in the selected table, and the selected entry includes gain settings for the gain stages of the receiver chain.