Receiver equalization circuitry using variable termination and T-coil

US12388490B2 · kind B2 · utility

Assignee

• Advanced Micro Devices, Inc. · US

Inventors

• Dean E. Gonzales · Santa Clara, US
• Edoardo Prete · Birkenfeld, DE
• Milam Paraschou · Dellwood, US
• Mark Chirachanchai · Stow, US
• Gerald R. Talbot · Boxborough, US

Key dates

• Filing date: Mar 25, 2022
• Grant date: Aug 12, 2025
• Expiry date: May 8, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01F17/08
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

Systems, apparatuses, and methods for performing efficient data transfer in a computing system are disclosed. A computing system includes multiple transmitters sending singled-ended data signals to multiple receivers. In order to better handle noise issues when using single-ended signaling, one or more of the receivers include equalization circuitry and termination circuitry. The termination circuitry prevents reflection on a corresponding transmission line ending at a corresponding receiver. The equalization circuitry uses a bridged T-coil circuit to provide continuous time linear equalization (CTLE) with no feedback loop. The equalization circuitry performs equalization by providing a high-pass filter that offsets the low-pass characteristics of a corresponding transmission line. A comparator of the receiver receives the input signal and compares it to a reference voltage. The placement of the comparator and the ratio of the inductances of the inductors of the bridged T-coil circuit are based on whether the receiver includes self-diagnostic circuitry.