Transimpedance amplifier with variable inductance input reducing peak variation over gain
US10574195B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2018 |
| Grant date | Feb 25, 2020 |
| Priority date | — |
| Expiry date | Oct 11, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0041
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transimpedance amplifier (TIA) structure includes an input node with a variable inductance component serving to reduce variation in peak amplitude over different gain conditions. According to certain embodiments, an inductor at the TIA input has a first node in communication with a Field Effect Transistor (FET) drain, and a second node in communication with the FET source. A control voltage applied to the FET gate effectively controls the input inductance by adding a variable impedance across the inductor. Under low gain conditions, lowering of inductance afforded by the control voltage applied to the FET reduces voltage peaking. TIAs in accordance with embodiments may be particularly suited to operate over a wide dynamic range to amplify incoming electrical signals received from a photodiode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.