Patent ID: 6522901
Filing Date: 2003-02-18
Classification: H03F

Abstract:
A portable radio transceiver, comprising a transmitter power amplifier (PA), 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, and negative bias generating means for providing negative bias (Vneg) to the transmitter power amplifier, wherein the negative bias generating means is also used for increasing a voltage applied to the gate of the series transistor so as to reduce its resistance, characterized in that the negative bias generating means comprises:a second transistor (V2) connected to the gate of the series transistor (V1), a third transistor (V3), the gate of which is adapted to receive said transmission control signal (TX on/off), a capacitor (C1) connected between the second and third transistors, and a diode means (D1) connected between the capacitor and the second transistor.