Power amplifier with bias control
US7477106B2 · kind B2 · utility
69Cited by
12References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 20, 2003 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | Aug 20, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/24
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A power amplifier (100) suitable for use in mobile telecommunications equipment has a first stage (2) and an optional second stage (2), each stage being provided with a bias circuit (4, 5). To provide a well-defined gain characteristic, in the first stage (1) a bias current (Ib1) is fed into a signal amplifying transistor (T1). The first bias circuit (4) comprises non-linear a voltage/current converter (41) coupled to a current mirror (40). To suit alternative applications, such as GSM and UMTS requiring a different bias, plural voltage/current converters (41, 42) may be provided in parallel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.