The Keysight 70420A Phase Noise Test Set is a 4-slot baseband module serving as the core component of the E5500 series phase noise measurement systems. It integrates phase detectors, phase-lock loop circuitry, and an MC68000 processor to deliver precise phase noise characterization across RF and microwave sources. The module supports carrier frequencies from 50 kHz to 1.6 GHz in standard configuration, with optional extensions to 26.5 GHz via Option 001 or Option 201. Input power acceptance varies by frequency band: 0 dBm to +23 dBm (R input) and +15 dBm to +23 dBm (L input) at low frequencies; 0 dBm to +5 dBm (R input) and +7 dBm to +10 dBm (L input) at high frequencies with Option 201. System-level performance includes offset frequency measurement from 0.01 Hz to 4 MHz (A-series) or 0.01 Hz to 100 MHz (B-series), with typical system noise of –180 dBc/Hz above 10 kHz offsets and spurious response at –120 dBc.
Technical Specifications
• Carrier Frequency Range (Standard): 50 kHz to 1.6 GHz
• Carrier Frequency Range (Option 001/201): 50 kHz to 26.5 GHz
• Input Power — Low Frequency (50 kHz to 1.6 GHz): R input 0 dBm to +23 dBm; L input +15 dBm to +23 dBm
• Input Power — High Frequency (1.2 GHz to 26 GHz, Option 201): R input 0 dBm to +5 dBm; L input +7 dBm to +10 dBm
• Offset Frequency Range (E5500 A-Series): 0.01 Hz to 4 MHz
• Offset Frequency Range (E5500 B-Series): 0.01 Hz to 100 MHz
• System Noise: Typically –180 dBc/Hz at offsets >10 kHz
• System Spurious Response: Typically –120 dBc
• Module Configuration: 4-slot MMS Baseband Phase Noise Test Set
• Weight: Approximately 2 lbs
– Key Features
• Phase detector and phase-lock loop architecture for stable phase noise acquisition
• MC68000 processor for signal processing and measurement control
• Flexible input impedance support via R and L input connectors
• Optional downconverter integration (70421A, 70422A, 70427A) for extended frequency coverage
• Option 001 includes high power input capability and AM detector functionality
• Ribbon cable interface for modular integration within E5500 chassis
– Typical Applications
• Communication system phase noise verification
• Radar source characterization
• Precision metrology and frequency standards testing
• Signal integrity optimization in frequency sources
– Compatibility & Integration
The 70420A operates as a dedicated module within Agilent E5500 A-series and B-series phase noise measurement systems. It integrates with digitizers, optional downconverters, and host PC control software to form complete measurement solutions. Downconverter options enable operation beyond the standard 1.6 GHz upper limit.
