Level shifter with gain
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United States of America Patent
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Aug 12, 2003
Grant Date -
Feb 6, 2003
app pub date -
Jul 31, 2001
filing date -
Jul 31, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A level shifting circuit for level shifting a control signal which sets a Gate voltage of a power amplifier includes circuitry for adding gain to the level shift. The addition of gain to the level shift causes the gate voltage to change faster than the control voltage, and this, in turn, makes it possible to get higher dynamics to control the Gate voltage of the power amplifier. When the circuitry is utilized in a power amplifier including a plurality of amplifier stages, problems associated with the output stage showing non-monotonic behavior can be avoided. The level shifting circuit is particularly useful in power amplifiers using MESFET transistors such as power amplifiers used in cellular telephones.
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