RF active balun circuit for improving small-signal linearity
US6473595B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1999 |
| Grant date | Oct 29, 2002 |
| Priority date | — |
| Expiry date | Nov 10, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3223
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The RF active balun circuit for improving a small-signal linearity in a power amplifying circuit of a CDMA system is provided under the construction of a signal amplifier driven by exterior individual direct current gate power VGG1, VGG2, for receiving a communication input signal AC-In and performing a cascode amplification at a normal operation point where a feedback third-order distortion signal becomes large; a distortion signal generator driven by exterior direct current gate power VGG3 different from the above power, for generating the communication input signal AC-In as the third-order distortion signal by nonlinearity of an active element to cancel the third-order distortion signal amplified in the signal amplifier; and an insulator provided for an insulation from a exterior driving power VGG3 applied to the distortion signal generator, thereby maintaining the small size, lower power and high efficient terminal characteristics by using a gain based on gate voltage of FET and the nonlinearity characteristic difference, and improving the linearity of an IC operating by a small signal or medium signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.