公开(公告)号：US10749716B2

公开(公告)日：2020-08-18

申请号：US15960532

申请日：2018-04-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Dongwei Chen ,  Amit Rane

IPC: H04L25/49 ,  H04L25/03

Abstract: A signal path linearizer for PAM4 SerDes communications compensates (including pre-compensates) for signal path nonlinearities. The linearizer can be configured with first and second differential gm stages, the first differential gm stage to provide a DC gain, and the second differential gm stage to introduce a defined nonlinear adjustment in DC gain by adding to or subtracting from the DC gain of the first differential gm stage. The differential gm stages can be configured to generate a compensated PAM4 signal with the combined DC gain providing a nonlinear wideband gain adjustment to compensate for nonlinearities in the PAM4 signal path. Compensation range can be increased by selective degeneration, and the compensation region can be shifted by selectively introducing input offset(s).

公开(公告)号：US20190312759A1

公开(公告)日：2019-10-10

申请号：US15960532

申请日：2018-04-23

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Dongwei Chen ,  Amit Rane

IPC: H04L25/49 ,  H04L25/03

Abstract: A signal path linearizer for PAM4 SerDes communications compensates (including pre-compensates) for signal path nonlinearities. The linearizer can be configured with first and second differential gm stages, the first differential gm stage to provide a DC gain, and the second differential gm stage to introduce a defined nonlinear adjustment in DC gain by adding to or subtracting from the DC gain of the first differential gm stage. The differential gm stages can be configured to generate a compensated PAM4 signal with the combined DC gain providing a nonlinear wideband gain adjustment to compensate for nonlinearities in the PAM4 signal path. Compensation range can be increased by selective degeneration, and the compensation region can be shifted by selectively introducing input offset(s).

公开(公告)号：US10128804B2

公开(公告)日：2018-11-13

申请号：US15394931

申请日：2016-12-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Amit Rane ,  Dongwei Chen

IPC: H03F3/45 ,  H03G1/00 ,  H03G3/30 ,  H03F1/32

Abstract: An equalizer, in at least some embodiments, comprises an amplifier configured to produce an amplified voltage signal that is a function of an ambient temperature affecting the equalizer. The equalizer also includes a linear equalizer stage coupled to the amplifier and comprising a transistor having a resistance controlled by the amplified voltage signal. The linear equalizer stage is configured to produce a voltage output signal having a gain that is dependent on the transistor resistance and on a frequency of the amplified voltage signal.