Amplifier and optical module performing gain control
US8248165B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2008 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Nov 12, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3084
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An amplifier includes a first transistor having a first conducting electrode receiving a current, a control electrode coupled to the first conducting electrode, and a second conducting electrode coupled to a fixed voltage source; a second transistor having a first conducting electrode, a second conducting electrode and a control electrode coupled to the control electrode of the first transistor; a feedback resistance coupled to the control electrode of the second transistor for feeding back an output of the second transistor to the control electrode of the second transistor; and a variable resistance element for controlling a ratio between a current flowing from the first conducting electrode of the first transistor into the control electrode of the second transistor and the feedback resistance and a current flowing from the first conducting electrode into the second conducting electrode in the first transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.