ACPR测量TECHNICAL FEATURE MEASURING ACPR IN CDMA AMPLIFIERS A djacent-channel power ratio (ACPR) testing is commonly used in the wireless communications industry to characterize the distortion performance of CDMA amplifiers. Related to spectral regrowth, ACPR is a measure of the intermodulation distortion that appears in the signal sidebands. It is analogous to third-order intercept measurements used to characterize narrowband amplifiers. Two alternative spectrum analyzer methods are used to make the industry-standard ACPR measurement: the resolution bandwidth (RBW) and integration bandwidth (IBW) methods. These two methods differ both in speed and in sensitivity to spectrum ripple. Results obtained using these methods match well provided the slope of the spectrum in the bandwidth of interest i……