Transimpedance amplifier with bandwidth extender
US10044328B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2015 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Apr 8, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/408
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A transimpedance amplifier that includes an input configured to receive a current input from an upstream device and output configured to present an output voltage. The current input may be from a photodetector or any other device that is part of an optical signal receiving unit front end. In one configuration, there are three amplifier stages in the transimpedance amplifier connected in series. A feedback path with feedback resistor connects between the input and output of the transimpedance amplifier. A bandwidth extender circuit connects between a stage output and a stage input of the transimpedance amplifier. In a three stage embodiment, the bandwidth extender circuit extends between an input of the second stage and the output of the second stage. The bandwidth extender includes at least one active device configured to provide positive feedback to increase gain. The bandwidth extender circuit is able to be automatically or selectively deactivated to filter unwanted frequency components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.