The Rohde & Schwarz SMGU is a high-performance synthesized signal generator delivering precise RF and microwave signal generation from 100 kHz to 2160 MHz. Built for research, development, and production environments, it combines exceptional spectral purity with comprehensive modulation capabilities and fast frequency switching. The instrument excels at receiver testing, adjacent-channel measurements, and low-noise reference applications, offering output power from -140 dBm to +13 dBm with 0.1 Hz frequency resolution.
Technical Specifications
Frequency Generation
• Frequency range: 100 kHz to 2160 MHz
• Frequency resolution: 0.1 Hz
• Frequency setting time: <10 ms standard; <1 ms per setting in fast mode (up to 200 user-defined frequencies via trigger or memory sweep)
• Time base stability: 0.000000001/day
• External frequency reference: 10 MHz
Output Performance
• Output power: -140 dBm to +13 dBm
• Output level switching time: 25 ms
• Output impedance: 50 Ohm
• Reverse power protection: Up to 50 W
Signal Purity
• Spectral purity: Extremely high—meets selectivity measurement requirements for top-class receiver testing
• Phase noise: -150 dBc/Hz minimum, -128 dBc/Hz maximum (single-sideband)
• Harmonics: ≤-30 dBc
• Non-harmonics: -94 dBc
• Spurious signals: <-30 dBc
Modulation
• AM: INT/EXT AC/EXT DC modes; 0–100% depth; 10 Hz to 50 kHz (3 dB bandwidth)
• FM: INT/EXT AC/EXT DC, two-tone, pre-emphasis; DC to 1 MHz modulation range
• PM: INT/EXT AC, two-tone; up to 320 rad hub
• Pulse: EXT mode; 80 dB on/off ratio; rise/fall times typically 20 ns (<10 ns above 200 MHz)
– Key Features
• Phase noise remains low across the carrier for LO and reference applications
• Fast frequency switching supports production test throughput
• FM DC mode delivers high carrier accuracy with minimal offset for FSK
• Pulse modulation with <20 ns edge rates
• VOR/ILS receiver testing capability via flat AM response at 30 Hz
– Typical Applications
• Receiver selectivity and sensitivity measurements
• Adjacent-channel and out-of-channel testing
• Navigation system receiver validation
• Low-noise reference source for measurement systems
• Production test and manufacturing environments
– Compatibility & Integration
• 10 MHz external frequency reference input
• Trigger-based frequency switching via memory sweep
• 50 Ohm impedance matching to standard RF test setups
