A Rail-To-Rail Input Receiver Employing Successive Regeneration and Adaptive Cancellation of Intermodulation Products

E. Keehr and A. Hajimiri

A direct conversion receiver is demonstrated which operates in the presence of a rail-to-rail (+12.4dBm) out-of-band blocker and a -16.3dBm blocker, where the ICP1 is +12.5dBm and the uncorrected extrapolated IIP3 is +33.5dBm. IM distortion is adaptively cancelled via feedforward loops which are digitally expanded to reproduce higher order nonlinear reference terms. Cancellation improves input-referred total IM distortion by over 24dB, resulting in an extrapolated IIP3 of +45.3dBm.