Electrically testing an optical receiver

US9960844B1 · kind B1 · utility

Assignee

• XILINX, INC. · US

Inventors

• Mayank Raj · San Jose, US
• Yohan Frans · Palo Alto, US
• Kun-Yung Chang · Los Altos Hills, US

Key dates

• Filing date: Mar 30, 2017
• Grant date: May 1, 2018
• Expiry date: Mar 30, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03K17/78
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An example photodiode emulator circuit includes: a first current source circuit; first and second transistors having sources coupled together and coupled to an output of the first current source circuit, a drain of the second transistor coupled to a first node; a third transistor coupled between a drain of the first transistor and a replica load circuit; a second current source circuit coupled to the first node; a capacitor coupled between the first node and electrical ground; and a fourth transistor having a source coupled to the first node and a drain that supplies an output current.