SChematics review

[pktron]

Review_4Jan.zip Hello All,

Please review the attached revised schematic and give your valuable feedback.

Please find below queries:


In case you want to know the distance of some component, then I have set the layout grid  to 1mm (white dots). This can be reference for review as well to check how far or close the component is placed.
I have added copper ground layer on top and bottom. This PCB is divided into two ground parts. One is for power supply ground and other is RF and Digital ground. Both are connected at single point as shown in image Top Copper Top Silk Screen.jpg.
There is no copper layer on bottom and top side of Antenna.
IAF antenna dimensions are considered from attached reference pdf only. Please provide the correction if any especially track length from IC to LC filter and up to IAF antenna.
Attachment is password protected. password: DTA_BHS_V1.1
In schematic Programming connector is there. RESET pin is used only for  programing purpose. In case programmer is not present this will be floating. So please check and correct.
Can we keep floating unused pins?

Please kindly do let’s know if you need any details in regarding this, Looking forward to hear you soon.

Thanks in advance

Pktron

Hello All.

I am working on master and multi slave project , please review my attached schematic and give your valuable feedback.

Thanks in advance pktronDTA_BHS_V1.0.pdf

[Jørn]

I see your schematic is marked confidential. Do keep in mind DevZone is a public forum where anyone can download and see your attachments. If your project is confidential you should create a support ticket on mypage over at nordicsemi.com.

[Jørn]

Hello pktron

I will assume you have used the component values as stated in the nRF52810 product specification, section 7.3.1 page 469.

Do note that capacitor C26, in the matching network, should be connected to Vss in the layout, with a trace that is as short as possible.

Also do note that all components in the reference schematic, with the exception of capacitors C9 and C10 and crystals, are in 0402 packages.

For reference layout see section 7.3.6, pages 474 and 475, of the product specification. The hardware reference files can be downloaded here.

It is recommended you follow the reference schematics and layout faithfully for optimal performance.

Best regards

Jørn Frøysa

[AmbystomaLabs]

Wow, between the BJT's, resistors and linear regulators you must have a lot of power to throw away.

Also, your antenna match is overly optimistic. Normally two elements are required just to get the nRF in line, likely you will need a couple of match components close to the antenna fix the antenna's problems.

[pktron]

Hello All,

Please review the attached revised schematic and give your valuable feedback.

Please find below queries:


In case you want to know the distance of some component, then I have set the layout grid  to 1mm (white dots). This can be reference for review as well to check how far or close the component is placed.
I have added copper ground layer on top and bottom. This PCB is divided into two ground parts. One is for power supply ground and other is RF and Digital ground. Both are connected at single point as shown in image Top Copper Top Silk Screen.jpg.
There is no copper layer on bottom and top side of Antenna.
IAF antenna dimensions are considered from attached reference pdf only. Please provide the correction if any especially track length from IC to LC filter and up to IAF antenna.
Attachment is password protected. password: DTA_BHS_V1.1
In schematic Programming connector is there. RESET pin is used only for  programing purpose. In case programmer is not present this will be floating. So please check and correct.
Can we keep floating unused pins?

Please kindly do let’s know if you need any details in regarding this, Looking forward to hear you soon.

Thanks in advance

Pktron

[AmbystomaLabs]

As for the schematic, I already said earlier that your design was done with no concern for power consumption. You waste a lot of power all over the board with the BJT's and the base resistors. But you might not care about power consumption.

On the layout see attached png. You cannot have the ground plane next to the F antenna. You will note that the reference design does not include this and only specifies that the distance from the edge of the board be D1. The ground plane you added will detune the antenna and change its pattern. Ideally, the antenna would terminate at the board edge, but I think it will be safe to just remove that little chunk of offending ground.

You should not have a split ground plane for a buck converter. First it will give you problems with unplanned ground currents and since you failed to include emi filters the noise will still propagate. Just have one ground plane for the entire board.