A digital image-rejection sub-system for low-IF receivers

This paper investigates in-phase/quadrature phase (I/Q) imbalances between the input paths of low intermediate frequency (IF) receiver. The imbalances exist along signal paths in subsystems such as the mixer and result in the image interference aliasing into the desired signal band, thus increasing the image-reject ratio (IRR) and degrading the performance of the receiver. This paper presents a new topology with digital complex sampling technique for the I/Q mismatch cancellation and gives the simulation result in MATLAB.