Stanford Research SG392 2 GHz Vector Generator

The Stanford Research Systems SG392 is a 2 GHz vector signal generator engineered for RF and microwave component and system testing. It combines analog and vector modulation capabilities using Rational Approximation Frequency Synthesis (RAFS), delivering spur-free outputs with low phase noise and 1 µHz frequency resolution across DC to 2.025 GHz. An ovenized SC-cut oscillator provides superior frequency stability and reduced in-close phase noise versus TCXO-based instruments.

Technical Specifications

• Carrier frequency: DC to 2.025 GHz, 1 µHz resolution


• RF output power: +25 dB gain to -130 dB attenuation in 156 digitally controlled steps


• Analog attenuator: 0.01 dB resolution with thermal compensation


• Output connectors: BNC and Type N Vector Modulation


• Carrier range: 400 MHz to 2.025 GHz


• Modulation bandwidth: 300 MHz


• I/Q inputs: 50 Ω, ±0.5 V rear panel; full-scale (I² + Q²)¹/² = 0.5 V


• Supported modes: BPSK, QPSK, OQPSK, DQPSK, π/4DQPSK, 8 PSK, 16 PSK, 3π/8 8 PSK, QAM (4–256), FSK, ASK, CPM, MSK, VSB (8VSB, 16VSB)


• Internal baseband: Dual 125 MHz arbitrary waveform generators; symbol rates to 6 MHz with programmable pulse shaping


• Preset standards: GSM, EDGE, W-CDMA, APCO-25, DECT, NADC, PDC, ATSC-DTV, TETRA Analog Modulation


• Types: AM, FM, phase modulation, pulse modulation


• FM deviation: 0.1 Hz minimum; up to 16 MHz (1.0125–2.025 GHz)


• AM: 0–100% (reduces above +7 dBm), 0.1% resolution


• AM distortion: <1% (fC < 62.5 MHz, 1 kHz), 62.5 MHz, 1 kHz)


• AM bandwidth: >100 kHz


• Internal sources: sine, ramp, saw, square, noise; external modulation input available

Key Features

• Spur-free synthesis with 1 µHz carrier resolution


• Direct I/Q input for custom modulation schemes


• Cascaded gain and attenuation with interpolation for output power accuracy


• Preset digital standards reduce setup time for common formats

Typical Applications

• RF component characterization and validation


• Digital and analog modulation testing


• Wireless protocol development and conformance testing


• Microwave system integration and bench measurements

Compatibility & Integration Rear-panel I/Q and external modulation inputs support integration with external baseband processors and test automation systems.