Patent ID: 7679543

Claim:
A current sampling mixer with harmonic rejection, comprising: a first current source connected to a first input terminal to provide a positive current of an input signal; a second current source connected to a second input terminal to provide a negative current of the input signal; a charge selector comprising a plurality of charge switches connected to the respective first and second current sources in parallel, wherein the charge switches are sequentially turned on during a charge time and are simultaneously turned off during a sum output time; a capacitor circuit comprising a plurality of capacitor pairs connected to the respective chare switches, wherein each of the capacitor pairs comprises a pre-capacitor and a post-capacitor; a weight selector comprising a plurality of weight switches connected to a current path between the pre-capacitor and post-capacitor of each of the capacitor pairs, wherein the weight switches are turned on during the charge time and are turned off for giving a weight during the sum output time; and a filter circuit comprising a plurality of output switches connected between the respective post-capacitors of the capacitor circuit and an output terminal, wherein the output switches are simultaneously turned on for a sum output during the sum output time.