## Summary of the STMicroelectronics AN4315 Application Note: BAL-NRF02D3 for Nordic nRF51822/nRF51422

This application note details the benefits and performance of the STMicroelectronics BAL-NRF02D3 balun, specifically designed for use with Nordic Semiconductor’s nRF51822 and nRF51422 wireless microcontroller series.

Key Benefits & Highlights:

️· Significant BOM Reduction: The BAL-NRF02D3 reduces the Bill of Materials (BOM) count by 80%, going from 5 components to just 1 for matching and harmonic filtering.
️· PCB Area Savings: It provides over 80% PCB area reduction compared to using the previous BAL-NRF01D3 and discrete components.
️· Simplified Design: The balun eliminates the need for RF expertise and measurement tools during design and validation.
️· Improved Performance: Offers high suppression of 2nd to 4th harmonics, simplifying FCC and ETSI compliance.
️· Symmetrical Layout: Promotes a symmetrical PCB layout for reduced trace lengths and optimized signal integrity.
️· Performance Data: The document presents measured performance data, including output power and harmonic suppression levels.
️· Layout Recommendations: It includes land pattern metrics and PCB stack-up recommendations for optimal implementation.



In essence, the BAL-NRF02D3 is presented as a highly integrated and effective solution that simplifies the RF design process, reduces component count and PCB space, and improves overall performance for applications utilizing the Nordic nRF51822/nRF51422.