High-performance vector signal sources are critical for advanced fields like communications testing, electronic warfare, and radar. Traditionally, RF chips and technologies have been dominated by foreign manufacturers, leading to supply chain vulnerabilities and high costs. To overcome this, a research team successfully developed a multi-channel vector signal source using domestic RF chips, marking a significant step toward independent and secure high-end testing equipment.

Core Architecture: Integrating FPGAs and Domestic RF Chips

To address the limitations of foreign signal source products, the research team designed a powerful system architecture. At its heart is the FPGA, responsible for signal generation, scheduling, and system control. The breakthrough lies in the use of the CX8242K RF transceiver chip, a domestically produced broadband RF chip, as the RF signal generator. This chip integrates a high-speed DAC, mixer, digital up-conversion (DUC), and power control module, supporting an instantaneous signal bandwidth of up to 1200 MHz, ensuring supply chain security and high performance.

Key Technologies: Achieving Wide Bandwidth and High Precision

The system features several critical technologies for high-speed data exchange and precise signal generation:

JESD204C Ultra-High-Speed Interface

This protocol, combined with FPGA’s high-speed serial transceiver, enables data transmission rates of 16.5 Gbps per channel, ensuring real-time transmission of broadband signals to the RF chip.

Precision Clock Synchronization

Using the HMC7044 clock management chip, the system synchronizes all channels’ clocks with low jitter, ensuring high-quality, multi-channel output.

Intelligent Frequency Planning

Dynamic adjustments of DAC sampling rates and interpolation coefficients prevent interference, delivering high-purity signals across a broad frequency band (10 MHz to 6 GHz).

Excellent Performance: Test Results and Validation

Experimental tests show outstanding performance for the RF chip-based signal source:

Wideband Output: Frequency range from 10 MHz to 6 GHz.

High Bandwidth: Supports up to 800 MHz modulation signal bandwidth per channel, surpassing commercial products.

Low Spurious Signals: Single-tone dynamic range exceeds 80 dBc, phase noise below -99 dBc/Hz at 1 kHz.

Multi-Channel Synchronization: Supports dual-channel synchronous output for testing advanced systems like phased arrays and MIMO.

Conclusion and Future Outlook

This research demonstrates the potential of domestic RF chips in creating high-performance, independent test equipment. The CX8242K RF chip has shown remarkable performance, underscoring the growing capabilities of domestic RF chips in high-end applications. As RF chip technology continues to evolve, China is advancing toward full independence in high-end electronics and instrumentation, reducing reliance on foreign products.