The Anritsu MG3670B Signal Generator equipped with a high performance quadrature modulator, outputs the signals needed to develop, test, and evaluate digital mobile communications equipment and related devices. Increase capabilties of the Anritsu MG3670B with expansion units. The MG3670B operates from 300 kHz to 2.25 MHz. Thie MG3670B 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 for evaluating device quality. A CMOS-level mode is provided for I/Q signal input. The input frequency band covers the CDMA spread spectrum band, expanding the range of applications.