Agilent/Keysight U9400C

The Keysight U9400C is a solid-state FET transfer switch engineered for RF and microwave switching across 300 kHz to 18 GHz. It delivers port-to-port isolation exceeding 100 dB at 8 GHz and 90 dB at 18 GHz, with switching speed of 500 ns and settling time below 0.35 ms— performance for FET-based architectures. Video leakage measures less than 5 mVpp, protecting sensitive RFIC components from signal corruption. An integrated TTL-compatible driver eliminates external driver requirements, streamlining system integration.

– Technical Specifications

• Operating Frequency Range: 300 kHz to 18 GHz
• Port-to-Port Isolation: >100 dB at 8 GHz; >90 dB at 18 GHz
• Video Leakage: <5 mVpp
• Switching Speed: 500 ns
• Settling Time: <0.35 ms (to 0.01 dB)
• Driver: Integrated TTL-compatible driver

– Key Features

• High Isolation Performance. Port-to-port isolation exceeding 100 dB at 8 GHz minimizes crosstalk in multi-port switching matrices and reduces signal coupling between channels.
• Ultra-Fast Settling. Settling time below 0.35 ms dramatically increases measurement throughput compared to mechanical or slower FET switch designs.
• Low Video Leakage. Less than 5 mVpp leakage prevents signal distortion and component damage when testing high-sensitivity devices.
• Broad Frequency Coverage. Single device operation from 300 kHz to 18 GHz accommodates diverse RF and microwave test configurations without requiring multiple switch types.
• Integrated Control. Built-in TTL driver eliminates external control circuitry, reducing board space and design complexity.

– Typical Applications

• RFIC component characterization and yield testing
• Instrumentation and communication test systems
• Radar and sensor signal routing
• Switch matrices for multi-channel RF measurements
• Mixer and amplifier characterization where leakage-induced distortion must remain below component noise floors

– Compatibility & Integration

The U9400C interfaces directly with TTL control logic, supporting plug-and-play integration into existing test platforms. Low settling time and high isolation make it suitable for fast-switching automated test equipment (ATE) and real-time measurement systems.