Method and apparatus for increasing an output impedance of a transmission amplifier during the receiving mode of a 2 - paths - according to direct a transmission unit

摘要

A transmission of a direct unit (200) uses a method and an apparatus for increasing an output impedance of a transmission amplifier, while a receive mode of a transmission of a direct unit. The transmission of a direct unit contains a transmission amplifier, an antenna (209) and a signal receiver (211), and is at least in a transmit mode and operable in a receive mode. During the transmission mode of the transmission amplifier is increased, which a reinforcement construction element (201) comprises an input signal (221) and supplies the amplified signal (233) to the antenna for transmission. During the receiving mode receives the antenna signals and provides the received signals to the signal receiver. In order to the action of the transmitter amplifier to the received signals during the receiving mode, couples the according to direct a transmission unit during the receiving mode to the antenna the transmission amplifier and applies a bias voltage (225) to the amplification construction element, in order to the output impedance (z, φ out φ) to increase of the transmission amplifier, so that the transmission amplifier the received signals is not significantly loaded.