Patent ID: 7190932
Filing Date: 2007-03-13
Classification: H03F,H04B

Abstract:
1. A circuit arrangement for a multimode mobile telephone comprising: a baseband comprising a first analog to digital converter, a second analog to digital converter and a digital to analog converter; a transceiver unit comprising a first receiver, a second receiver, an amplifier, an antenna changeover switch, and a receiving antenna, an output of the first receiver being connected to the first analog to digital converter, an output of the second receiver being connected to the second analog to digital converter, an input of the amplifier being connected to the digital to analog converter, an input of the first receiver being connected to the antenna changeover switch, an input of the second receiver being connected to the antenna changeover switch, an output of the amplifier being connected to the antenna changeover switch, and the antenna changeover switch being connected to the receiving antenna, wherein the second receiver provides a feedback branch using digital adaptive predistortion; and a switching element that creates an optional connection by connecting the amplifier output to the second receiver input whereby the second receiver input is disconnected from the antenna changeover switch.