Regarding nRF51822 RF range using balun and minimum layers required for balun

RE: Regarding nRF51822 RF range using balun and minimum layers required for balun

Locky — Mon, 23 Feb 2015 18:56:47 GMT

You need to calculate your transmission trace impedance using an impedance calculator and the dimensions of your PCB i.e. substrate height, material, copper layer thickness, style of transmission trace...etc

RE: Regarding nRF51822 RF range using balun and minimum layers required for balun

Asbjørn — Mon, 23 Feb 2015 15:15:08 GMT

You can use a 2 layer board to implement the balun as well. Keep in mind that in nRF51822-PCN we state that using the BAL_NRF01D3 with our nRF51822-QFAA/AB are likely to fail Korean requirements with regard to spurious.

Designs based on nRF51822-QFAA/nRF51822-QFAB combined with ST Microelectronics balun, BAL-NRF01D3 (as described in the reference layout nRF51822-DF-ST v1.0), are likely to fail Korean teleregulatory spurious emission limits due to LO leakage.

You would have to ensure that the track width are 50 Ohm from the output of the balun towards the antenna based on the parameters of your board.

RE: Regarding nRF51822 RF range using balun and minimum layers required for balun

Shahid Ali Nadaf — Mon, 23 Feb 2015 06:53:43 GMT

Hi,

I did not find the 2 layer board for nRF 51822 QFN with Balun BALF-NRF01D3 QFN package. I checked on the Nordic website even there they have provided 4 layer board design.

Now if i design a 2 layer board on my own, can i use the same track width for the RF section as provided by the 4 layer Design by Nordic?? Or should i follow any other track width and track length standards?

Won't the impedence matching of my 2 layer board get affected if i use the track length and track width given by Nordic for 4 layer design?

Looking forward for your reply.

RE: Regarding nRF51822 RF range using balun and minimum layers required for balun

Shahid Ali Nadaf — Mon, 23 Feb 2015 06:26:35 GMT

Hi,

Thanks for your reply. It has helped me a lot.

As is said i want a 2 layer board, But Nordic has provided a 4 layer gerber files with BALF-NRF01D3 QFN package.

is it possible to design 2 layer board with nRF 51822, BALF-NRF01D3 QFN package and chip antenna?? Or a 4 layer board is required for this Balun??

Looking forward for your reply.

RE: Regarding nRF51822 RF range using balun and minimum layers required for balun

Shahid Ali Nadaf — Mon, 23 Feb 2015 06:25:32 GMT

Hi,

Thanks for your reply. It has helped me a lot.

As is said i want a 2 layer board, But Nordic has provided a 4 layer gerber files with BALF-NRF01D3 QFN package.

is it possible to design 2 layer board with nRF 51822, BALF-NRF01D3 QFN package and chip antenna?? Or a 4 layer board is required for this Balun??

I did not find the 2 layer board for nRF 51822 QFN with Balun BALF-NRF01D3 QFN package. I checked on the Nordic website even there they have provided 4 layer board design.

Won't the impedence matching of my 2 layer board get affected if i use the track length and track width given by Nordic for 4 layer design?

Is there any nRF 51822 QFN with Balun BALF-NRF01D3 QFN package 2 layer board design for my reference.

Looking forward for your reply.

RE: Regarding nRF51822 RF range using balun and minimum layers required for balun

FormerMember — Thu, 19 Feb 2015 14:54:56 GMT

I would recommend you to read the blog post "General PCB design guidelines for nRF51", it should answer most of your questions.

BALF-NRF01D3 should not be used with the WLCSP version, it should be used with the QFN version of nRF51822.