Frequency conversion and frequency selection it is integrated with the various filter examples

摘要

PROBLEM TO BE SOLVED: To reduce spurious waves by integrating a frequency selection circuit and a frequency conversion circuit.;SOLUTION: A frequency converter 1708 including a down-converter for undersampling an input signal and converting the undersampled input signal into a lowpass frequency and a delay module and a delay module including at least a portion of the delay module delay the output signal, a scaling module scales the delayed output signal, an adder 1720 subsequently performs addition, and the output signal is obtained as an IF signal or a baseband signal.;COPYRIGHT: (C)2002,JPO