Rohde & Schwarz AMIQ03 I/Q Modulation Generator

The Rohde & Schwarz AMIQ03 is a dual-channel I/Q modulation generator engineered to produce complex baseband and intermediate frequency signals for wireless communication and aerospace testing. It generates I/Q baseband signals up to 25 MHz IF with sample rates reaching 100 Msample/s per channel, supported by 4,000,000 samples of memory depth per channel. The instrument delivers 14-bit amplitude resolution, expandable to 16-bit with optional digital I/Q output, and achieves Adjacent Channel Power of typically -78 dBc for WCDMA 3GPP FDD configurations.

Automatic amplitude/offset alignment and fine skew adjustment minimize error vectors and ensure excellent channel symmetry. The AMIQ03 integrates with Rohde & Schwarz WinIQSIM™ software and vector signal generators like the SMIQ, offering direct baseband signal generation for I/Q modulator and demodulator testing, multi-carrier simulation, and 3GPP CDMA/WCDMA signal generation. Remote control is provided via GPIB/IEEE and RS-232-C interfaces, with optional differential I/Q outputs and digital I/Q waveform data at 68-pin SCSI connector.

Four user-programmable marker outputs synchronize to the sample clock. Internal storage includes hard disk and floppy disk drives for waveform management.

Technical Specifications

• Sample Rate: Up to 100 Msample/s per channel


• Memory Depth: 4,000,000 samples per channel (AMM03)


• Amplitude Resolution: 14-bit standard; up to 16-bit with Option AMIQ-B3


• IF Signal Generation: Up to 25 MHz


• Clock Frequency: Up to 100 MHz


• External Clock Input: 10 Hz to 4 MHz (slow mode); 2 MHz to 100 MHz (fast mode)


• Internal Reference Clock: 10 MHz with aging <1 × 10⁻⁵/year after 30 days; temperature coefficient <2 × 10⁻⁶


• Adjacent Channel Power: Typically -78 dBc for WCDMA 3GPP FDD Test Model 1 (64 DPCH channels) at 5 MHz and 10 MHz offset

Key Features

• Dual-channel architecture for simultaneous I/Q signal generation


• Optimized filters for group delay, frequency response, and channel matching


• Automatic amplitude/offset alignment with fine skew adjustment


• Four user-programmable marker outputs with sample clock synchronization


• Optional differential I/Q outputs (Option AMIQ-B2)


• Optional digital I/Q output with selectable 8-bit to 16-bit resolution via 68-pin SCSI connector (Option AMIQ-B3)

Typical Applications

• I/Q modulator and demodulator testing


• Driving I/Q inputs of vector signal generators


• Multi-carrier signal simulation


• CDMA and WCDMA 3GPP signal generation


• TDMA frame configuration testing

Compatibility & Integration

• Remote control via GPIB/IEEE and RS-232-C


• Integration with Rohde & Schwarz WinIQSIM™ software


• Compatible with Rohde & Schwarz SMIQ vector signal generators


• Integrated hard disk and floppy disk storage for waveform data