Mixer using four quadrant multiplier with reactive feedback elements

摘要

A mixer is formed from a four quadrant multiplier to include a common node, first and second cross connected differential amplifiers, a first transistor having a collector coupled to a common emitter node of the first differential amplifier and a second transistor having a collector coupled to a common emitter node of the second differential amplifier. The mixer further includes a first series feedback reactance element coupled between an emitter of the first transistor and the mixer common node and a second series feedback reactance element coupled between an emitter of the second transistor and the mixer common node. The mixer further includes a first shunt feedback reactance element coupled between a base and the collector of the first transistor, and a second shunt feedback reactance element coupled between a base and the collector of the second transistor. In an alternative embodiment of the mixer, the mixer further includes first and second output nodes, a third shunt feedback reactance element coupled between the base of the first transistor and the first output node of the mixer, and a fourth shunt feedback reactance element coupled between the base of the second transistor and the second output node of the mixer.