Abstract: With increasing demand for mobile wireless receivers of low power and high integration, the zero-IF receiver demonstrates a greater advantage than the conventional superheterodyne receivers. The normal zero-IF topology with the single quadrature channels is very sensitive to the phase-error of the phase-shift network of LO. It decreases the image-reject ratio (IRR) and limits the applications of this structure. This paper presents a new topology called double-quadrature zero-IF topology, which is insensitive to the phase-error of the phase-shift network of LO and greatly increases the performance of the zero-IF receiver.

Key words: single-quadrature zero-IF receiver, phase-shift network, double-quadratrue zero-IF receiver, mobile communication