Method and structure for controlling bandwidth and peaking over gain in a variable gain amplifier (VGA)
US10833643B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 2018 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | Jan 11, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G5/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method of controlling bandwidth and peaking over gain in a variable gain amplifier (VGA) device and structure therefor. The device includes at least three differential transistor pairs configured as a cross-coupled differential amplifier with differential input nodes, differential bias nodes, differential output nodes, a current source node, and two cross-coupling nodes. The cross-coupled differential amplifier includes a load resistor coupled to each of the differential output nodes and one of the cross-coupling nodes, and a load inductor coupled to the each of the cross-coupling nodes and a power supply rail. A current source is electrically coupled to the current source node. The cross-coupling configuration with the load resistance and inductance results in a lower bandwidth and lowered peaking at low gain compared to high gain. Further, the tap point into the inductor can be chosen as another variable to “tune” the bandwidth and peaking in a communication system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.