Patent ID: 8923443

Claim:
A direct-conversion type wireless receiver, comprising: a pair of mixers configured to frequency-convert a radio signal received from an antenna into base band signals by local signals having different phases; a first amplification circuit configured to amplify a base band signal from one of the mixers up to a demodulation level; a second amplification circuit provided between said one of the mixers and the first amplification circuit; a variable current circuit including a multi-stage current mirror to add a current 2 n times as high as a reference current, wherein n is an integer equal to or greater than zero; a control unit configured to correct a DC offset of said one of the mixers by allowing a current to flow into the second amplification circuit from the variable current circuit, based on an output of the first amplification circuit; and a capacitor connected between a gate and a source of a PchMOSFET which allows the reference current to flow therethrough.