公开(公告)号：US20240121009A1

公开(公告)日：2024-04-11

申请号：US18170326

申请日：2023-02-16

Applicant: Cisco Technology, Inc.

Inventor： Simon S. PANG ,  Wei LI

IPC: H04B10/69 ,  H04B10/61

CPC classification number: H04B10/6971 ,  H04B10/612

Abstract: A waveguide delay-based equalization (WDEQ) system is described. The WDEQ system provides a delay in waveguides of the system and electrical signal summing in a differential transimpedance amplifier (TIA) which increases the performance (e.g., bandwidth, etc.) of the optical receiver. The WDEQ system includes an optoelectronic circuit with a directional coupler, a first photodetector, at least two transistors connected to the first photodetector, an optical delay, and a differential transimpedance amplifier (TIA).

公开(公告)号：US20230122287A1

公开(公告)日：2023-04-20

申请号：US17451574

申请日：2021-10-20

Applicant: Cisco Technology, Inc.

Inventor： Mehmet M. EKER ,  Simon S. PANG ,  Joseph J. BALARDETA

IPC: H03F3/08 ,  H03F3/45

Abstract: A differential transimpedance amplifier (DTIA) includes a first input, a second input, a first output, and a second output. The DTIA also includes a first inverter and a second inverter connected in series to the first input. The DTIA further includes a third inverter and a fourth inverter connected in series to the second input. The first inverter and the fourth inverter receive a first supply voltage from a first voltage regulator. The second inverter and the third inverter receive a second supply voltage from a second voltage regulator. The first supply voltage changes (i) based on a difference between voltages on the first output and the second output and (ii) while the second supply voltage remains fixed.