AMIQ is a modulation source for complex baseband signals of state-of-the-art telecommunication networks. Two synchronous outputs, which are matched to each other, and a large memory together with wide analog bandwidth make AMIQ suitable for universal use. AMIQ has been designed to generate I and Q signals in the baseband for present and future types of modulation. "I" stands for the in-phase component, "Q" for the quadrature component. The data to be output by AMIQ are normally calculated by an external workstation (eg PC). To control this calculation, Rohde & Schwarz offers two programs: WINIQSIM and AMIQ Control, a software for R&S vector signal generator SMIQ (see Section "Software for AMIQ Control on page 1.8"). The desired information data stream (eg a piece of speech) is generated and a modulation mode selected. Then various interference and distortions (so-called impairments) are superimposed to this (ideal) baseband signal. Thus a long sequence of sample values is obtained, which are loaded into AMIQ (via floppy, IEC/IEEE bus or RS-232 interface). The sequence in the AMIQ memory is then output as analog I and Q signals with the aid of fast and accurate D/A converters. The outputs are (normally) connected to the modulation inputs of an I/Q modulator (eg SMIQ), which modulates the baseband signal onto the desired RF