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2450BM14A0002 Matched Balun for Nordic nRF24L01/nRF24L01+

This technical note is also available in PDF Format: pdf Nordic nRF24L01/nRF24L01+ App Note (516k)

Johanson Technology, Inc. 2450BM14A0002 Matched Balun for the Nordic nRF24L01/nRF24L01+ Chipsets

November 2009

 

1. Introduction

The nRF24L01/nRF24L01+ from Nordic Semiconductor is a 2.45GHz one chip, ultra low power transceiver.

Johanson Technology’s, 2450BM14A0002 LPF-Balun was specifically designed for use with the nRF24L01/nRF24L01+ chipsets. This matched balun greatly simplifies the RF front-end by considerably reducing component count, system variability, implementation size area, and PCB sensitivity.

Figure 1 JTI Photograph Reference Design 2450BM14A0002

Figure 1. Component picture.
The 2450BM14A0002 is an SMD six-pin LTCC device with a small foot print of only 1.6 mm x 0.8 mm (EIA 0603).

 

2. Description of the Reference Design

Johanson Technology has developed a solution with a chip Balun-Harmonic filter integrated passive component that is especially matched for the nRF24L01/nRF24L01+ ICs, the 2450BM15A0002, shown in Figure 1.

Figure 2 Discrete Reference Design 2450BM14A0002

Figure 2. Integrated Reference Design
The rightmost is the JTI matched balun 2450BM14A0002.

Please refer to Appendix A for the datasheet of the balun filter component. For more updated information from the Johanson Technology web site at:
http://johansontechnology.com/en/integrated-passives/chipset-specific-baluns.html

The traditional reference design for RF balun has been the discrete solution shown in Figure 2.

Figure 2 Discrete Reference Design 2450BM14A0002

Figure 2. Discrete Reference Design

 

3. Layout
Figure 3 CC2530 JTI Design Layout 2450BM14A0002

Figure 3. Layer 1 of the Reference Design Layout

In the event that the reference design can not be copied, then the routing from the RF pins ANT1 and ANT2 must be symmetrical to the matched balun component, 2450BM14A0002. The length of the tracks should be kept to a minimum and preferably the same length and width that are used in the reference design. If this routing is not symmetrical, then the output power may be reduced and the harmonics may increase.

The component placement influences the RF performance. It is recommended that the reference PCB layout be copied as closely as possible. In particular, the designer should make note of all dimensions between the nRF24L01/nRF24L01+ and 2450BM14A0002.

 

4. Measurement Results

All results presented in this chapter are based on measurements performed with nRF24L01/nRF24L01+ and 2450BM14A0002 Reference Design board. All measurement results presented are the average of each batch tested from typical devices.

Johanson’s 2450BM14A0002 Harmonic Filter - Balun offers improved suppressed 2nd and 3rd harmonics, it eases implementation and increases margin to FCC/ETSI compliance when compared to solution with discrete passives.

Fundamental
Fundamental
Fundamental Hi
Fundamental Hi
Fundamental Mid
Fundamental Mid
2nd Harmonic
2nd Harmonic

3rd Harmonic
4th Harmonic
4th Harmonic
Figure 4. Active Measurement Results
Carrier Sweep
Carrier Sweep
2nd Harmonic Sweep
2nd Harmonic Sweep
3rd Harmonic Sweep
3rd Harmonic Sweep
4th Harmonic Sweep
4th Harmonic Sweep
Figure 5. Sweep Measurement Results

 

Appendix A

Appendix A

The latest specification can be downloaded from the following link:
http://johansontechnology.com/en/integrated-passives/chipset-specific-baluns.html

 

Appendix A

The latest specification can be downloaded from the following link:
http://johansontechnology.com/en/integrated-passives/chipset-specific-baluns.html

 
 

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