Patent ID: 6947717
Filing Date: 2005-09-20
Classification: H03D

Abstract:
1. A mixer for mixing an RF input signal with a local oscillator signal to provide an intermediate frequency signal, comprising: a) a first balun transformer having a first winding, a second winding and a third winding, the first winding coupled to the second and third windings, the first winding connected between a local oscillator terminal and ground, the second winding connected between ground and a first node, the third winding connected between ground and a second node, the first balun transformer further having a first core and a first, a second and a third wire, the first wire and the second wire twisted together and partially wound on the first core, the first wire and the third wire twisted together and partially wound on the first core; b) a second balun transformer having a fourth winding, a fifth winding and a sixth winding, the fourth winding coupled to the fifth and sixth windings, the fourth winding connected between an RF terminal and ground, the fifth winding connected between an intermediate frequency terminal and a third node, the sixth winding connected between the intermediate frequency terminal and a fourth node; and c) four diodes, one diode being connected between each of the first, second, third and fourth nodes.