High frequency power amplifier circuit
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United States of America Patent
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Nov 22, 2005
Issued Date -
N/A
app pub date -
Mar 15, 2005
filing date -
Jun 29, 2001
priority date (Note) -
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Abstract
A module including a bias circuit that generates gate bias voltages by resistance dividers creates a problem in that the values of the resistances constituting the bias circuit must be finely adjusted, and accordingly extra trimming tasks are required. The present invention provides current generators that generate currents varying with desired characteristics responsive to a control voltage, independent of variations in transistor threshold voltages, connects output resistors to parallel transistors in respective stages to form current mirror circuits, and supplies currents from the current generators thereto to drive them, instead of supplying dividing voltages.
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