RF passive mixer

Device is used to transfer incoming useful intermediate-frequency signal (IF) to high frequencies (RF). Quadrature mixer consists of two double balanced passive mixers, their heterodyne frequencies has 90 degree shift. Scheme in the form of passive mixer provides low supply current and high linearity. Each mixer can be divided into three separated mixers, which phases of heterodyne frequencies have -45, 0, +45 degree shifts, what provides rejection of third and fifth harmonics of high-frequency signal (HR system).