The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 2020
Filed:
Apr. 23, 2018
Texas Instruments Incorporated, Dallas, TX (US);
Dongwei Chen, Pleasanton, CA (US);
Amit Rane, Santa Clara, CA (US);
TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US);
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).