Patent ID: 8629698

Claim:
A mixing circuit comprising: an input unit including a first MOS transistor of a grounded-gate type with a source into which an input signal is input, and a second MOS transistor of a grounded-source type with a gate into which the input signal is input; a frequency converter for converting frequencies of a first current signal output from a drain of the first MOS transistor and a second current signal output from a drain of the second MOS transistor, based upon a local oscillation signal to generate a third current signal and a fourth current signal; and an output voltage signal generator including a first load element for receiving the third current signal to convert into a first output voltage signal, and a second load element for receiving the fourth current signal to convert into a second output voltage signal, wherein the first load element is a third MOS transistor with a gate and a drain connected, and the second load element is a fourth MOS transistor with a gate and a drain connected, and wherein the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor are identical in a channel length and a channel width, and wherein the first MOS transistor, the second MOS transistor, the third MOS transistor, and the fourth MOS transistor have an identical conductivity type.