Rohde & Schwarz SMR40 10MHz – 40GHz Signal Generator

The Rohde & Schwarz SMR40 is a microwave signal generator spanning 10 MHz to 40 GHz, engineered for receiver measurements, scalar network analysis, and demanding RF test scenarios across aerospace, defense, and communications. It delivers exceptional spectral purity through advanced fractional-N frequency synthesis, with output power exceeding +9 dBm at 40 GHz and adjustable levels down to -130 dBm via optional RF attenuation. The instrument combines low SSB phase noise (< -83 dBc at 10 GHz, 10 kHz offset) with excellent spurious suppression and harmonic rejection - below -55 dBc from 30 MHz to 20 GHz, and below -40 dBc above 20 GHz.

Technical Specifications

• Frequency Range: 10 MHz to 40 GHz


• Frequency Resolution: 0.1 Hz


• Output Power: Greater than +9 dBm at 40 GHz; adjustable with compensation above -20 dBm


• Output Range (with optional attenuator): -130 dBm to +9 dBm


• SSB Phase Noise: < -83 dBc (10 GHz, 10 kHz offset, CW, FM off, 1 Hz bandwidth)


• Harmonics Suppression: < -55 dBc (30 MHz < f ≤ 20 GHz); 20 GHz)


• Non-Harmonics: < -60 dBc (f ≤ 20 GHz); 20 GHz)

Key Features

• Pulse Modulation (Standard): Internal pulse generator with on/off ratio better than 80 dB; rise/fall times shorter than 12 ns; widths to 25 ns


• Optional Modulation (B5): AM/FM/LF generator (0.1 Hz to 10 MHz), FM bandwidth DC to 5 MHz, FSK data rates 0 to 2 MHz, ASK, scan, and phase modulation; all modes combinable


• Sweep Capability (Standard): Digital RF, level, and frequency sweep; 10 user-selectable frequency markers


• Optional Analog Sweep (B4): Synthesized ramp sweep to 600 MHz/ms (f > 2 GHz)


• Operating Modes: Automatic, singleshot, manual, externally triggered


• Calibration Cycle: 3 years

Typical Applications Receiver characterization, network scalar analysis, component testing, and system validation in microwave and millimeter-wave development and production environments.

Compatibility & Integration Highly configurable with optional modules including OCXO reference oscillator (Option B1) for enhanced frequency stability and aging performance.