Amplifier

An amplifier for a receiver circuit, the amplifier having an input node (Vin) and an output node (Vout), comprising

• a tunable tank circuit connected to the output node (Vout), wherein the tunable tank circuit is tunable over a frequency range having a plurality of frequency bands, wherein each of the frequency bands has a respective one of a plurality of center frequencies;
• a feedback circuit path connected between the output node (Vout) and the input node (Vin);
• and
• a tunable capacitor connected between an internal node of the feedback circuit path and a reference-voltage node, wherein the tunable capacitor is configured to be dynamically tunable over a plurality of capacitance values in correspondence with a concurrent tuning of the tunable tank circuit, wherein each of the capacitance values is configured to cause the amplifier to have a predefined input impedance when the tunable tank circuit is tuned to the respective one of the center frequencies.