Power amplifier with bias control
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United States of America Patent
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Jan 13, 2009
Grant Date -
Jul 6, 2006
app pub date -
Nov 20, 2003
filing date -
Dec 19, 2002
priority date (Note) -
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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.
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