The Keysight E7770A Common Interface Unit (CIU) is a bidirectional intermediate frequency interface that extends network analyzer frequency coverage for 5G wireless development and testing. It up- or down-converts sub-6 GHz RF signals to IF ranges of 6–12 GHz or 7.7–14.5 GHz, enabling integration with mmWave transceivers such as the M1740A for remote radio head (RRH) characterization. The E7770A provides centralized signal routing, local oscillator distribution, and multi-channel management in automated test environments. Its modular, card-based architecture supports flexible configuration of signal processing, frequency synthesis, and coherent distribution across multiple test channels, delivering synchronized measurements and complex RF analysis.
Technical Specifications
Frequency Conversion
• RF input frequency range: Sub-6 GHz
• IF output range: 6–12 GHz or 7.7–14.5 GHz
• Maximum channel bandwidth: 800 MHz (Fc = 6–8.6 GHz and 9–12 GHz)
• Up-converted DUT-IF: 6–12 GHz with 400 MHz channel bandwidth
• Frequency setting resolution: 1 Hz (RF = 5.65–12.35 GHz)
Power and Gain
• Channel power output: 0 dBm to noise floor (15 dB crest factor) when driven by network/channel emulator
• Tx gain level accuracy (DUT IF): ≤ ±1.5 dB @ 25 °C typical; ≤ ±2.5 dB across 20–30 °C range
Interfaces
• DUT IF output: 2 per channel card, N-type connectors
– Key Features
• Bidirectional IF interface supporting up- and down-conversion
• Independent LO frequency input and control for compatible mmWave transceivers
• Modular card-based architecture: channel cards for signal processing, LO cards for frequency synthesis, distribution cards for coherent multi-channel routing
• Integrated power delivery and LO distribution for simplified multi-port systems
• 1 Hz frequency resolution for precise signal tuning
– Typical Applications
• 5G RRH testing and validation
• Sub-6 GHz to high-IF frequency conversion in phased-array antenna characterization
• Multi-channel synchronized RF measurements in production test environments
• mmWave transceiver integration and control
– Compatibility & Integration
The E7770A interfaces with Keysight M1740A mmWave transceivers and network analyzers, supporting centralized LO and control signal distribution for coherent multi-channel operation.
