Rf mixer is a three-port electronic circuit that can combine two or more signals into one or two composite output signals. RF mixers are divided into switching mixers or nonlinear mixers, many mixers are used in these two configurations. The mixer using diode is passive mixer, which will cause conversion loss. Mixers using active devices such as transistors may have conversion gains. A variety of circuit topologies exist for mixers, simple circuit topologies are as simple as using a single diode, and complex circuit topologies can be used to improve performance.
