The Keysight U9400A is a solid-state FET transfer switch engineered for RF and microwave signal routing in test systems. It delivers high port-to-port isolation, fast switching speed, and exceptionally low video leakage—critical advantages when testing sensitive RFIC components, mixers, and amplifiers.
Technical Specifications
Frequency Range: 300 kHz to 8 GHz
Electrical Characteristics:
• Port-to-port isolation: > 100 dB at 8 GHz
• Insertion loss: < 3.0 dB (300 kHz to 4 GHz); 15 dB
• Switching speed: 500 ns (4/0.5 µs based on 50% TTL to 90% RF / 50% TTL to 10% RF)
• Settling time: 350 µs (to 0.01 dB of final value)
• Video leakage: Typically 90 mVpp; < 5 mVpp
• Characteristic impedance: 50 Ω nominal
Control: Integrated TTL-compatible driver; SMA (f) connectors
– Key Features
• settling time of 350 µs enables higher measurement throughput compared to typical FET switches exceeding 50 ms
• Low video leakage (< 5 mVpp) minimizes risk of damage to sensitive RFIC components; superior to PIN switches which exhibit ≥ 1 V leakage
• Broad frequency coverage from 300 kHz to 8 GHz supports diverse RF and microwave test configurations
• High isolation exceeding 100 dB at 8 GHz suppresses crosstalk in multiplexed signal routing
• Fast switching at 500 ns enables rapid test sequencing
– Typical Applications
• Instrumentation and radar signal switching
• Communication system test matrices
• EGSM/GSM power amplifier testing
• Signal routing between multiple instruments and DUTs
• Drop-out switching, SPDT operation, and active device bypass configurations
– Compatibility & Integration
The U9400A integrates into RF and microwave test systems via its TTL-compatible driver and SMA connectors, supporting both single-pole switching and multi-instrument signal routing without additional control interface complexity.
