Current sampling mixer with harmonic rejection

PURPOSE: A current sampling mixer with a harmonic rejection function is provided to obtain the harmonic rejection function by selecting and combining capacitors with the weight by changing the current sampler structure with the capacitors. CONSTITUTION: A first current source is connected to a first input terminal and supplies the positive current of an input signal. A second current source is connected to a second input terminal and supplies the negative current of an input signal. A charge selection unit(110) includes a plurality of charge switches. The charge switches are successively on for a charge time and are off for the sum output time. A capacitor circuit unit(120) includes a plurality of capacitor pairs connected to the charge switches. The capacitor pair includes a front capacitor and a rear capacitor. A weight selection unit(130) includes the weight switches. The weight switches are on for the charging time and are off for the sum output time to apply the weight. A filtering circuit(140) includes a plurality of output switches. The output switches are on for the sum output.