Patent ID: 7711347

Claim:
A mixer comprising: an amplifier which amplifies an input signal using at least first and second amplifier elements; a mixing unit which mixes the input signal amplified by the amplifier with a local oscillator (LO) signal output from a local oscillator, wherein the mixing unit comprises at least first and second pairs of metal-oxide semiconductor field effect transistors (MOSFETs), wherein each of the MOSFETs comprises a gate, a source, a drain and a body node, wherein the first pair comprises first and second MOSFETs which switch an output current of the first amplifier element, and the second pair comprises third and fourth MOSFETs that switch an output current of the second amplifier element, and wherein a positive local oscillator signal (LO+) is applied to the gate and the body node of the first MOSFET, and the gate and the body node of the fourth MOSFET, and a negative local oscillator signal (LO−) which is 180° out of phase with the LO+ is applied to the gate and the body node of the second MOSFET and the gate and the body node of the third MOSFET, and wherein the gate and the body node of the second MOSFET and the gate and the body node of the third MOSFET are connected to one another and the negative local oscillator signal (LO−) is simultaneously input to the gate and the body node of the second and third MOSFETs.