Method and apparatus for increasing the impedance of an amplifier out of transmission during reception mode of the communication unit in both directions.

摘要

b "method and apparatus for increasing the impedance of an amplifier out of transmission during reception mode of the communication unit in both directions' ' d .A communication unit (200) employs a method and apparatus for increasing output impedance of an amplifier for transmission during a mode of type approval of the communication unit.The communication unit includes an amplifier for transmission, an antenna (209), and a signal receiver (211), and is operable in at least a transmission mode and a reception mode.During the transmission mode, the transmission amplifier, which includes a device for amplification (201).Amplifies an input signal (221) and provides the amplified signal (233) to the antenna for transmission.During the receive mode, the antenna receives signals and provides the signals received to the signal receiver.To mitigate the effect of the transmission amplifier on the signals received during the reception mode, the communication unit, during the event and receipt.The transmission amplifier couples to the antenna and applies a bias device (225) to the amplifier to increase the output impedance (Z ~ out ~) of the amplifier for transmission.So that the transmission amplifier doesn't significantly signals received.