Radio frequency receiver

A radio frequency receiver device comprising:

• a receiver input arranged to receive signals having one or more frequency components within a frequency spectrum;
• a plurality of filters each having a filter output impedance;
• and
• a plurality of amplifiers each comprising:
• an amplifier input connected to the output of a corresponding one of the plurality of filters;
• an amplifier output;
• at least one radio frequency input transistor;
• and a feedback circuit including at least one feedback resistor, said feedback circuit being connected between the amplifier input and the amplifier output;
• wherein the device is arranged to be selectably operable in:
• a first mode wherein each amplifier has first feedback resistance and transconductance values respectively such that each amplifier input impedance is substantially the same as the output impedance of the corresponding filter;
• and
• a second mode wherein each amplifier has second feedback resistance and transconductance values respectively such that upon connection of a predetermined external impedance matching circuit between each amplifier and the corresponding filter, each amplifier input impedance is substantially the same as the output impedance of the corresponding filter.