The Rohde & Schwarz SMIQ04B is a synthesized vector signal generator spanning 300 kHz to 4.4 GHz, engineered to produce complex modulated signals for communication system development, type-approval testing, and production environments. Built on digital signal processor technology, it delivers high-precision digital modulation at high bit rates across multiple standards without mode restrictions, while simultaneously supporting analog modulation including AM, FM, phase, and pulse modes. The instrument combines flexible I/Q modulation with exceptional spectral purity and fast frequency switching, making it suitable for RF component characterization and multistandard signal synthesis.
– Technical Specifications
Frequency Performance
• Frequency range: 300 kHz to 4.4 GHz
• Frequency resolution: 0.1 Hz or 100.0 mHz
• Frequency switching time: 15 ms typical (< 3 ms without attenuator switching)
• Frequency hopping: 500 µs
• Time base stability: 0.000001 /yr
• External reference: 16 MHz input (1 MHz to 16 MHz in 1 MHz steps)
Output Characteristics
• Power range: −140 dBm to +13 dBm PEP
• Power resolution: 0.1 dB (0.01 dB in CW/FM/phase/auto attenuator modes)
• Output impedance: 50 Ohm
• VSWR: < 2
Spectral Purity (CW)
• Single-sideband noise: −116 to −126 dBc/Hz
• Broadband noise (20 MHz–450 MHz): < −136 dBc (−142 dBc typ.)
• Broadband noise (450 MHz–3040 MHz): < −138 dBc (−144 dBc typ.)
• Harmonic content: −30 dBc; non-harmonics: −60 dBc
– Key Features
• High-grade I/Q modulator standard; minimizes error vector magnitude and intermodulation
• Digital modulation: PSK, QAM, FSK, ASK, MSK without bit-rate limitations
• Analog modulation: AM, FM, phase, pulse
• Vector and wideband AM modes
• Fine frequency resolution (0.1 Hz) for precision tuning
– Typical Applications
• Multistandard transceiver development and validation
• Component characterization (amplifiers, filters, mixers)
• Type-approval testing for wireless standards
• Production signal synthesis across IF and RF bands
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