公开(公告)号：US20230246636A1

公开(公告)日：2023-08-03

申请号：US17587095

申请日：2022-01-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Shita GUO ,  Amit S. RANE

IPC: H03K5/1252 ,  H03K5/02 ,  H03K17/56

CPC classification number: H03K5/1252 ,  H03K5/02 ,  H03K17/56

Abstract: An eye expander that increases the transmitter linearity of Pulse-Amplitude Modulation 4-Level (PAM4) signals having an inner eye and two outer eyes. In embodiments, the eye expander includes a semi-linear gain stage that increases the eye height of the outer eyes. In some of those embodiments, the semi-linear gain stage includes a semi-linear gain input transistor having a base or gate coupled to an input terminal and a collector or drain coupled to an output terminal, a semi-linear gain resistor coupled to the emitter or source of the semi-linear gain input transistor, and semi-linear gain transistor-resistor pairs that selectively connect the emitter or source of the semi-linear gain input transistor to ground. In some embodiments, the eye expander includes a limiting gain stage that reduces the eye height of the inner eye and a linear gain stage that increases the eye height of the inner and outer eyes.

公开(公告)号：US20200059224A1

公开(公告)日：2020-02-20

申请号：US16367381

申请日：2019-03-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yanfei JIANG ,  Huanzhang HUANG ,  Yonghui TANG ,  Shita GUO

IPC: H03K5/00 ,  H03K5/1252 ,  G05F1/46 ,  H03K19/20 ,  H03K19/0175

Abstract: Aspects of the disclosure provide for a method. In some examples, the method includes detecting a transition in an input signal (IN), generating a bias current based on the detected transition in IN, and modifying a charge status of a capacitor based on the charge current. The method further includes generating an output signal (OUT) based on the charge status of the capacitor, disabling the bias current generation based on values of IN and OUT, and strongly pulling the capacitor up or down based on the disabling the bias current generation.