Mobile communication device for use in e.g. global system for mobile communication system, has power amplifier arranged in signal path between signal path input and impedance adjusting circuit and operating at transmission time

摘要

The device has an impedance adjusting circuit (IAS) arranged in a signal path (SP) between a signal path input (SPE) and a signal path output (SPA). The adjusting circuit is provided for tuning variable load impedance. A front end circuit (FEC) has a control circuit (STS) that controls the adjusting circuit, and a power amplifier (PA) is arranged in the signal path between the path input and the adjusting circuit. The power amplifier operates at a transmission time slot that begins at a time T0, where the control circuit adjusts the impedance of the adjusting circuit within a time interval.