Agilent / Keysight 8644A Synthesized Signal Generator 0.25-1030 M

The Agilent/Keysight 8644A is a synthesized signal generator delivering precise RF signal generation across 252 kHz to 1030 MHz, with optional coverage to 2060 MHz. This instrument combines exceptional frequency resolution, low phase noise, and configurable modulation to support demanding RF and communications testing in laboratory, manufacturing, and service environments.

Technical Specifications

• Frequency range: 252 kHz to 1030 MHz (Option 002 extends to 2060 MHz)


• Frequency resolution: 0.01 Hz


• Frequency accuracy: Traceable to internal reference; with Option 031 (High Stability Time Base), aging <5 × 10⁻⁸/day after 10 days warm-up


• Frequency switching time: <50 msec to within 100 Hz of final frequency; <200 msec with FM enabled; −127 dBm


• Output SWR: Typically <1.7:1 at outputs <−2 dBm


• Reverse power protection: 50 W from 50 Ω source, 25 Vdc Spectral Purity


• Phase noise: −128 dBc/Hz standard at 20 kHz offset, 1 GHz carrier (Option 004: −136 dBc/Hz)


• Harmonic content: −30 dBc at +10 dBm output; Option 002 achieves <−30 dBc (0.25–1030 MHz) and <−25 dBc (1030–2060 MHz) at +8 dBm


• Nonharmonic spurious: 15 kHz offset, 0.25–1030 MHz); 15 kHz offset, 1030–2060 MHz)


• Third-order intermodulation: Typically <−50 dBc at outputs <8 dBm Modulation


• Types: AM, FM, pulse modulation


• AM depth: 0–100%; rates to 100 kHz; 0.1% resolution; distortion ~2% for 0–30% depth at 0.25–1030 MHz


• FM deviation: Up to 20 MHz

Key Features

• Modular platform architecture for application-specific configuration


• 0.01 Hz resolution for precision frequency setting


• Wide amplitude control from −137 dBm to +16 dBm


• Low phase noise and spurious content for sensitive RF applications


• Multiple sweep modes supporting both analog and stepped frequency control

Typical Applications RF component testing, communications system development, receiver and transmitter characterization, phase noise measurements, modulation testing, and broadband system validation.