FREQUENCY CONVERTER

PROBLEM TO BE SOLVED: To provide a frequency converter having a mixer circuit and a filter circuit, capable of stable down-conversion in the mixer circuit. SOLUTION: The frequency converter includes a first adjustment means for adjusting an oscillation frequency in an oscillation circuit connected to the mixer circuit, a second adjustment means for adjusting a cutoff frequency in the filter circuit, and an adjustment circuit for controlling the first adjustment means and the second adjustment means. Further, the first adjustment means is configured of the same structure as the second adjustment means. Or, the first adjustment means and the second adjustment means are variable resistance circuits having a plurality of switches for switching resistance values, and the first adjustment means has the same number of switches as the second adjustment means, in which an on/off state of the switch in the first adjustment means is set to the same as an on/off state of the switch in the second adjustment means. COPYRIGHT: (C)2005,JPO&NCIPI