Amplitude domain circuits and methods for reducing an interference signal that spectrally overlaps a desired signal

A circuit for reducing interference in a received signal comprising a desired signal and an interference signal that spectrally overlaps the desired signal, the circuit comprising:

• a splitter subcircuit configured to split the received signal into a first portion and a second portion;
• an envelope detector coupled to the splitter subcircuit and configured to detect an envelope of the first portion as a function of time so as to estimate an amplitude A(t) of the first portion as a function of time;
• an interference suppression subcircuit coupled to the envelope detector and configured to suppress at least a portion of a contribution of the interference signal to the estimated amplitude A(t) to generate an interference suppressed amplitude A′(t) having reduced contribution from the interference signal;
• a matched delay subcircuit coupled to the splitter subcircuit and configured to delay the second portion by an amount of time corresponding to the envelope detection and suppression;
• and
• a multiplier subcircuit coupled to the matched delay subcircuit and the interference suppression subcircuit and configured to multiply the interference suppressed amplitude A′(t) by the delayed second portion to obtain an output having reduced contribution from the interference signal.