HETERODYNE RECEIVER CIRCUIT AND RADIO WAVE CLOCK COMPOSITE CIRCUIT USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an adjustment circuit with which it is possible to adjust the frequency of a filter circuit with high accuracy while suppressing an increase in current consumption.SOLUTION: A heterodyne receiver circuit according to the present invention has: a local oscillation circuit 20 accepting a reference signal from the outside as input and generating a local oscillation signal; a MIX circuit 50 for generating an intermediate signal; a filter circuit for extracting the intermediate signal and generating an IF signal used in detection; a first adjustment circuit for adjusting manufacturing variations in the intermediate frequency of the filter circuit; first storage means for storing the data adjusted by the first adjustment circuit; a second adjustment circuit for adjusting variation in the intermediate signal caused by a shift from the logical value of the reference signal; and a first communication circuit for inputting the data adjusted by the second adjustment circuit. Regarding the adjustment of variation in the intermediate frequency, the second adjustment circuit corrects the frequency error of the reference signal outputted by an oscillation circuit 5 by adjusting the center frequency of the IF circuit 23 on the basis of the adjustment data, and thereby does not adjust the frequency of the oscillation circuit 5.SELECTED DRAWING: Figure 1