RADIO RECEIVER USING A FEEDBACK LOOP TO COMPENSATE I/Q AMPLITUDE ERRORS, AND METHOD

摘要

The invention relates to a quadrature demodulating radio receiver and to a method for reducing an imbalance in gain between an in-phase channel and a quadrature channel of such a radio receiver. Received radio frequency signals are downconverted to in-phase and quadrature-phase signals, either to a baseband or a certain IF frequency. In order to improve the performance of the channels, it is proposed that imbalances in gain or amplitude between the two channels are compensated in the analog domain. This is achieved by employing in at least one of the channels amplifying means with an adjustable gain for amplifying received signals in the analog domain, the adjustable gain being controlled according to a detected imbalance in gain. The invention moreover relates to an equivalently designed radio transmitter and a corresponding method. The invention equally relates to components and communications systems including such a radio receiver or transmitter, and to a transconductance mixer for such a radio receiver or transmitter.