Adaptive class AB amplifier for TDMA wireless communications sys

Details Adaptive class AB amplifier for TDMA wireless communications sys Adaptive class AB amplifier for TDMA wireless communications sys

1994-01-28

1995-06-20

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

330277, 330279, 455116, H04B 104

Patent

active

054266416

ABSTRACT:
In a TDM/TDMA portable radio communications system, the modulated RF signal transmitted by a portable handset unit is amplified for uplink transmission to a port by an adaptive class AB power amplifier. A class AB amplifier provides the necessary amplification for the low power levels to be output by the portable units, but must be biased just slightly "on" with no signal input for required maximum efficiency and linearity. In order to maintain the amplifier at a proper bias level over changing temperature conditions and free from the effects of device aging and device-to-device variations, the drain current of the amplifier is monitored each frame outside the burst interval in which the portable is transmitting and thus when no signal is present at its input. The drain current is then controlled by adjusting the gate voltage to compensate for any variations.

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