Wide dynamic range transimpedance amplifier
US6844784B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2003 |
| Grant date | Jan 18, 2005 |
| Priority date | — |
| Expiry date | Feb 21, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A wide dynamic range transimpedance amplifier for fiber optics receivers. An automatic transimpedance gain control and DC cancellation control feedback circuit include a pnp transistor that is connected with the input signal. The impedance seen at the emitter of the pnp transistor changes according to the average value of the photodiode input current. Thus, large signal amplitudes are attenuated at the input of the transimpedance amplifier by the transistor and small signal amplitudes are amplified. The transistor is a variable impedance that can increase the optical overload without diminishing or reducing the optical sensitivity of the transimpedance amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.