Error correction within power amplifiers
US6259320A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Dec 27, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3229
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A feed forward power amplifier has a main amplifier and an error compensation path that compares the input and output of the main amplifier and subsequently adjusts the output signal from the main amplifier. Currently, such a design requires the implementation of a delay apparatus to delay the output of the main amplifier in order to compensate for the delay within the error compensation path. This delay apparatus implemented within a high-power area costs the power amplifier in terms of money, size, and/or efficiency. With the implementation of a phase compensation filter within the error compensation path, the delay apparatus can be removed. The phase compensation filter has a frequency versus phase characteristic with a positive slope for a limited bandwidth and a constant frequency versus gain characteristic. This allows, for the limited bandwidth, the characteristic of the error compensation path to be similar to that of the undelayed output of the main amplifier. The use of a phase compensation filter within a feedback power amplifier can also have benefits, as the bandwidth of the power amplifier can be expanded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.