An amplifier is arranged to receive an input signal and provide an output signal in response, and includes a main amplifier core and an auxiliary circuit. The main amplifier core includes an input node, an output node and a sum node with the input node coupled to the input signal, and is arranged to provide an interior signal to the sum node and output the output signal at the output node in response to signals provided to the sum node. The auxiliary circuit is coupled between the input node and the sum node, and is arranged to match an impedance of the input node and provide a cancelling signal to the sum node in response to the input signal. An associated receiver is also disclosed.