Amplifier circuit
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United States of America Patent
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-
Mar 18, 2003
Grant Date -
Jul 26, 2001
app pub date -
Jan 22, 2001
filing date -
Jan 20, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A reference stage is provided in order to compensate for manufacturing tolerances, for example relating to the threshold voltage of a transistor. This reference stage has a transistor which is a physical equivalent of the transistor to be trimmed in a radio-frequency amplifier stage. In particular, this reference transistor has the same electrical direct current characteristics as the amplifier transistor. A reference voltage can be tapped off across a resistor on the reference stage and can be supplied to a control amplifier which uses this reference voltage to set the operating point of the radio-frequency amplifier transistor such that manufacturing tolerances are compensated for. Such radio-frequency power amplifiers are used, for example, as transmit amplifiers in mobile radios.
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