Method and apparatus for high efficiency power amplification
US5990735A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Apr 1, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G3/3042
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an multi-stage class S modulator (270), and a power amplifier (260). The multi-stage class S modulator (270) includes multiple stages (480), where each stage includes a pair of switching transistors (430, 440) and a capacitor (450). The capacitor (450) supplies the inrush current requirements of the stage (480) so that filtering at the switching frequency is substantially provided within the stage (480). Multiple stages (480) are included on a single semiconductor substrate resulting in higher switching frequencies, higher modulation bandwidths, and lower external filtering requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.