| 摘要 |
PURPOSE:To attain low spurious radiation, miniaturization and the reduction in cost by providing a base band signal processing means applying correction to eliminate a part or all of offset errors, amplitude errors and quadrature errors of two sets of diphase modulators in response to a modulation frequency. CONSTITUTION:A data corresponding to a correction value of each error in response to the frequency is stored in a memory 15, and a CPU 14 controls the frequency of a local oscillator 17, reads out of the data of each correction in response to the frequency and gives the read correction data to correction circuits 13a-13d. The correction circuits 13a-13d convert each correction data into the correction in response to the base band signal and supplies the result to a band signal processing section 12. Then the base band signal processing section 12 applies the correction of amplitude error, quadrature error, offset (x) and offset (y) as to the base band signal to be inputted. Thus, the low spurious radiation, the miniaturization and the reduction in the cost are attained. |
