METHOD AND DEVICE FOR EXPANDING DYNAMIC RANGE OF FREQUENCY MIXER

摘要

PROBLEM TO BE SOLVED: To provide a mixer of a dynamic range that becomes wider. SOLUTION: A frequency mixing system uses a feedforward device to reduce the distortion of a signal which occurs due to the amplitude adjustment of an input signal and generates a needed frequency conversion signal which includes the cross modulation distortion of a level that is lower and/or allowable. For instance, the distortion of a signal from a 1st path can be introduced onto a 2nd path 22 and next, a frequency converted by using a 2nd mixer 38 on the path 22 is returned to the 1st path to supply a necessary frequency conversion signal including the cross modulation distortion of a level that is allowable and/or lower and to connect with the distortion of the signal on the 1st path. The frequency mixing system supplies an expanded dynamic range by increasing the difference between the amplitude of the necessary frequency conversion signal and the amplitude of the cross modulation distortion.