Transimpedance amplifier and PON system
US8653433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2010 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Mar 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/6931
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a gain-switching-type transimpedance amplifier, in order to provide a technique capable of preventing unnecessary gain switching caused when noise is received, and preventing decrease in sensitivity caused when noise with a large input level is received, and then, a burst signal with a small input level is received, a transimpedance amplifier 5 includes: a pre-amplifier 200 to which the burst signal is inputted; an average detection start determination unit 300 for comparing an output of a pre-amplifier 200 with a first threshold voltage; an average detection circuit 400 for detecting and outputting an average value of the output of the pre-amplifier 200 during a certain period of time from a time point when the output of the pre-amplifier 200 exceeds the first threshold voltage; and a gain switching control unit 500 for determining whether to switch a gain of the pre-amplifier 200 based on an output of the average detection circuit 400.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.