Variable gain amplifier with temperature compensation and gain linearity enhancement
US7262661B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2005 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Nov 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45352
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A variable gain amplifier contains a plurality of differential transistor pairs. A temperature dependent current is generated in the current path of each differential transistor pair. A generated gain control current is converted to a temperature dependent gain control current and applied in circuit with control inputs of the transistors of the paired differential transistors. The temperature dependent gain control current is obtained from a gain control current corresponding to a desired gain which is then multiplying the control current by the temperature dependent current. The temperature dependent gain control current is modified to compensate for gain non-linearity by introducing an offset as a function of the gain control current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.