| 摘要 |
PROBLEM TO BE SOLVED: To provide the accurate and efficient adjustment testing method and device of digital communication equipment using a quadrature modulation signal. SOLUTION: This adjustment testing method of the filter of digital communication equipment using a quadrature modulation signal comprises a step for inputting a quadrature modulation signal for test to the filter, a step for acquiring I and Q signals by performing quadrature demodulation of an output signal from the filter, a step for calculating vector precision on an IQ plane from the I and Q signals, and a step for adjusting the filter so that the vector precision can be minimized.
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