MIXER CIRCUIT

PROBLEM TO BE SOLVED: To provide a mixer circuit which indicates high linearity with low noise while suppressing expansion of circuit scale. SOLUTION: A mixer circuit includes: a transconductor unit 11 for converting an inputted high frequency voltage into a high frequency current; a mixer core unit 12 which generates a conversion current by performing frequency conversion upon the high frequency current outputted from the transconductor unit 11 based on an inputted low frequency local signal; and an output unit 13 for outputting the conversion current outputted from the mixer core unit 12 to the outside. The mixer circuit further includes a constant current sources I1 and I2 for the transconductor connected to connecting nodes of the transconductor unit 11 and the mixer core unit 12 in order to supply a predetermined first current to the transconductor unit 11; and constant current sources I3 and I4 for the mixer core connected to connecting nodes of the mixer core unit 12 and the output unit 13 in order to supply a predetermined second current to the mixer core unit 12. COPYRIGHT: (C)2008,JPO&INPIT