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Smart Bluetooth Forum Discussions

moutasimk_66
Employee
Employee

Hi,

in order to get a new design based on BCM20737S, we want to know what's the effect when we change the PCB layout and add the coin cell battery on the bottom of the chip. we have to make the board as small as possible.

is there any reference design that used a ceramic antenna with the BCM2073x family ?

thx

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It's my understanding that the placement of the battery is not an intergral part of the RF design. More immportant items include the location of the connection to system ground, size of the keep out area and the shape of the ground plane that is used for the embedded BLE antenna.

Guidelines for the optimal PCB design are described in the PCB/Layout section of the BCM20737S Bluetooth Low Energy SiP Module Technical Reference

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BoonT_56
Employee
Employee
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it may not make sense to comment on the layout without actually looking at it. but if there is a layer of ground between the chip and battery, that may mitigate to some extent. the chip antenna supplier will often provide some layout guidelines based on their products.

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in the case of use of BCM20737S, the antenna is embedded on the chip. the refdesign put the coincell battery in side of the rf circuit. is that necesseray ?

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It's my understanding that the placement of the battery is not an intergral part of the RF design. More immportant items include the location of the connection to system ground, size of the keep out area and the shape of the ground plane that is used for the embedded BLE antenna.

Guidelines for the optimal PCB design are described in the PCB/Layout section of the BCM20737S Bluetooth Low Energy SiP Module Technical Reference

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