Frequency-independent smart interference suppression for multi-standard transceivers

In this paper an approach is proposed for the suppression of a large unwanted signal without making use of frequency selectivity, but rather by exploiting a nonlinear transfer function. The general requirements for large-signal suppression by this technique are analyzed in the context of a multi-standard transceiver. Also the consequences for weak desired signals and external interference are being discussed. The IIP₃ for external interference is derived, and consequences for the noise performance. The proposed technique shows a good IIP₃ performance, but comes with a penalty of increasing the output noise by 3dB because of the spectrum mirroring that takes place.