CC1310 Chinese AMR Reference Design make a change band

Hi,

Refer to this thread, you'll find the cc1310-433MHz ref design attached to one of the posts by TER.

For 14 dBm output power, the standard ref design can be used. The Chinese AMR Reference design can be used for different frequencies only if a higher output power is needed. i.e. > 20 dBm.

//Richard

Richard, could you advise us on which components of the AMR reference design should be changed to allow it to operate on the 868MHz band?

Thank you!

Thanks Richard!  That's really helpful.

What's the reason for swapping L22 to a 0 ohm instead of matching the value of L21 as it does in the original 490MHz BoM?  

Extra filtering was required for the 490 MHz design. For the 868 MHz design, the harmonics were at a sufficient level so a 0 ohm resistor could be used. If extra margin would be required for the harmonics then an inductor can be used for filtering purposes.

Hi Richard,

Is this "Chinese AMR Reference have a discrete power amplifier" design also suitable for SigFox network? How about 915MHz band reference value?

BR,

Taka

Hi Taka,

This design can also be used at 868 / 915 MHz as well but I recommend to look at the CC1190 as a first choice of FEM since this contains a PA, LNA and switch.

Please refer to the standard schematic for the discrete PA design (v.1.3.6) for the standard BOM for 490 MHz. To update the design to 868/915 MHz, please update the following values:

L21:   5.6 nH

L22:   0 ohm

C21:   8.2 pF

C22:   2.2 pF

C23:   120 pF

R21:   15k

R22:   3.9k

L23:   12nH

L24, L25: 1.8 nH

C24:   5.1 pF 

C27:   3.9 pF

C28:   3.5 pF 

C29:   3.9pF

Expect around 20 dBm with this BOM for 868/915 MHz but the values are dependent on the layout. 

Regards,

   Richard

Richard,

Is there a plan for a CC1190 + CC1310 reference design?  And if so when might that be available?  

Thanks