The Anritsu MG3671B is a Digital Modulation Signal Generator equipped with high performance quadrature modulator. The MG3671B outputs signals needed to develop, test, and evaluate digital mobile communications equipment and related devices. The MG3671B has a frequency range of 300 kHz to 2.75 GHz. It provides a stable and precise output as well as spectrum purity up to +13 dBm, even with modulation. In addition to testing receiver sensitivity and excess input, it can be used for testing IF stage performance and evaluating device quality. A CMOS-level mode is provided for I/Q signal input. The input frequency band covers the CDMA spread spectrum band.