A rail-to-rail input receiver employing successive regeneration and adaptive cancellation of intermodulation products

摘要

A direct conversion receiver is demonstratedudwhich operates in the presence of a rail-to-rail (+12.4dBm)udout-of-band blocker and a -16.3dBm blocker, where the ICP1udis +12.5dBm and the uncorrected extrapolated IIP3 isud+33.5dBm. IM distortion is adaptively cancelled viaudfeedforward loops which are digitally expanded to reproduceudhigher order nonlinear reference terms. Cancellationudimproves input-referred total IM distortion by over 24dB,udresulting in an extrapolated IIP3 of +45.3dBm.