Radio frequency amplifier with improved intermodulation performance
US6876843B2 · kind B2 · utility
3Cited by
13References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2002 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | Mar 5, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/372
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A radio frequency amplifier of improved intermodulation performance is provided by connecting first and second transconductance amplifiers in antiphase so that third order intermodulation products cancel each other but the reduction in gain is relatively small. The transconductance stages comprise long tail pairs of transistors provided with tail current sources formed by transistors whose bases are connected to a bias voltage source. The first transistor has an emitter connected via a resistor to ground. The second transistor has an emitter connected via another resistor to the emitter of the first transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.