| 摘要 |
PROBLEM TO BE SOLVED: To realize the digital modulation circuit in which a gain offset adjustment time is reduced. SOLUTION: An A/D converter 9 and a gain offset control circuit 10 provided in common for two systems of data, I signal (i) and a Q signal (q) generate adjustment data in response to each amplitude of the I and Q signals and an object amplitude. Then gain offset adjustment circuits 2, 3 adjust respectively the two system of data in response to the generated adjustment data. Thus, the gain offset is adjusted with only one control without the need for measuring a spectral characteristic and the adjustment manhours are reduced. |
