Receiver circuit for use in radio communications and communications unit including such a circuit

摘要

A receiver circuit (106) for a radio communication unit, the receiver circuit comprising an amplifier (220) operable to provide the receiver with a dynamic performance which is variable according to the value of an input current control signal applied to the amplifier and a downconverter (240) for downconverting a received radio frequency signal to one of intermediate or baseband frequency, signal measurement means (270) for measuring a wideband signal strength of a received radio frequency signal and having an output which is coupled to the amplifier and operable to provide a control signal giving dynamic control of the the amplifier and characterised in that the amplifier is in a circuit path of the receiver operational at radio frequency prior to downconverting by the downconverter. <??>The receiver circuit provides the advantage that the necessary dynamic range is determined in an adaptive, real-time manner so as to save battery current drain. <IMAGE>