Agilent / Keysight 8665B High-Performance Signal Generator, 6 GHz

The Agilent/Keysight 8665B is a synthesized signal generator engineered for RF and microwave testing from 100 kHz to 6 GHz. It delivers precise frequency synthesis, low-noise performance, and flexible modulation in a single instrument suited to receiver characterization, radar testing, and production environments. This generator spans 100 kHz to 6 GHz with amplitude control from -139.9 dBm to +13 dBm and 0.01 Hz frequency resolution.

Output level accuracy reaches ±1 dB above -119.9 dBm across most bands, with tighter performance available through optional enhancements. SSB phase noise typically measures -140 dBc/Hz at 20 kHz offset (1 GHz, with Option 004), and nonharmonic spurious levels stay below -100 dBc to 2 GHz.

Technical Specifications

• Frequency Range: 100 kHz to 6 GHz


• Amplitude Range: -139.9 dBm to +13 dBm


• Frequency Resolution: 0.01 Hz


• Output Level Accuracy: ±1 dB (≥ -119.9 dBm, most bands); ±1.5 dB (1000–3000 MHz); ±2 dB (3000–6000 MHz); ±3 dB (< -119.9 dBm)


• SSB Phase Noise: Typically -140 dBc/Hz at 20 kHz offset, 1 GHz (Option 004)


• Nonharmonic Spurious: < -100 dBc to 2 GHz


• Timebase: High-stability oven-controlled (standard)


• RF Leakage: Typically 80 dB on/off ratio, < 5 ns rise/fall times


• Internal modulation sources: sine, square, triangle, sawtooth, and Gaussian noise waveforms


• Sine/noise waveforms to 400 kHz with low distortion; triangle/sawtooth/square to 50 kHz


• Two independent modulation sources for two-tone testing


• Digitally stepped frequency sweep with linear/log modes over full 6 GHz range; sweep times 20 ms to 10 s


• 40 MHz span capability (carrier frequency dependent)

Typical Applications

• Receiver sensitivity and selectivity testing


• Out-of-channel receiver validation


• Radar system development and verification


• Spurious immunity characterization (< 85 dB receivers with Option 004)

Compatibility & Integration Options include high-stability timebase (001), rear panel I/O (003), low-noise enhancement (004), pulse modulation (008), and reduced RF leakage shielding (010).