Patent ID: 7446590

Claim:
A mixer comprising: an inputting stage connected to a first signal source; and a switching stage including a first and second switch pairs, the first switch pair having a first and second transistors, and the second switch pair having a third and fourth transistors, first terminals of the first, second, third and fourth transistors being connected to a second signal source, second terminals of the first and second transistors being connected together as a first junction, second terminals of the third and fourth transistors being connected together as a second junction, the first and second junctions being directly connected to the inputting stage, and third terminals of the first and third transistors being connected together as an output port, and third terminals of second and fourth transistors being connected together as another output port, the switching stage further including a first inductive element connected to the first junction, a first current source connected with the first inductive element, and a first capacitive element connected between the first inductive element and ground, a second inductive element connected to the second junction, a second current source connected with the second inductive element, and a second capacitive element connected between the second inductive element and ground, wherein an inductive impedance of the first inductive element is sufficient to substantially cancel a parasitic capacitance induced at the first switch pair and capacitance of the first capacitor, and an inductive impedance of the second inductive element is sufficient to substantially cancel a parasitic capacitance induced at the second switch pair and capacitance of the second capacitor.