Multimode mobile telephone, e.g. for GSM and 3G networks, has dynamically adaptive predistortion system including unused receiver module to process transmit signal sample

摘要

The mobile phone includes baseband circuitry (1) with two analog-to-digital and one digital-to-analog converters (6.1,6.3,7). A transceiver unit (2) includes at least a two receiver modules (3.1, 3.2) for different frequency bands, one (3.2) including a memory for processing a digital adaptive predistortion signal. When operating in a first frequency band, a switch (9) disconnects the second receiver from the antenna circuit (10) and instead supplies a sample signal from the transmitter power amplifier (4), so that the otherwise unused receiver forms part of a predistortion circuit.