Portable radio transceiver
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Mar 16, 2000
filing date -
Mar 16, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A portable radio transceiver has a transmitter power amplifier (PA) and a series transistor (V1), which is connected to the transmitter power amplifier and is adapted, in response to a transmission control signal (TX on/off), to control transmission by the transmitter power amplifier. Negative bias generating means provides negative bias (V.sub.neg) to the transmitter power amplifier and is also used for increasing a voltage applied to the gate of the series transistor so as to reduce its resistance. The negative bias generating means has a second transistor (V2) connected to the gate of the series transistor (V1), and a third transistor (V3), the gate of which is adapted to receive the transmission control signal (TX on/off) It also has a capacitor (C1) connected between the second and third transistors, and a diode means (D1) connected between the capacitor and the second transistor.
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