Power amplifier linearizer that compensates for long-time-constant memory effects and method therefor
US6731168B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Aug 16, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3247
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power amplifier linearizer (12) includes an on-chip portion (60) and an external controller (22). The on-chip portion (60) implements two predistortion circuits (86, 88) desirably configured as look-up tables. One predistortion circuit (88) is programmed by the external controller (22) to apply a hotter linearizing translation function (54) and the other predistortion circuit (86) is programmed by the external controller (22) to apply a colder linearizing translation function (56). One or more temperature signals (24, 38) are correlated with the temperatures experienced by a power amplifier (34) and drive a power amplifier thermal modeler (50) implemented in the controller (22). As a result of running the thermal modeler (50), the controller (22) generates an interpolation signal (26) that indicates how far to interpolate between the hotter and colder translation functions (54, 56).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.