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Using CC1120 in VHF 144 MHz band

Vishal Desai
Prodigy 150 points
Other Parts Discussed in Thread: CC1120

The datasheet of CC1120 mentions frequency band of 136.7 MHz to 160 MHz. It also mentions to contact TI for additional information. Can the IC be used in these frequencies? If yes, then are there any restrictions on its use? Where can I find additional information for the same?

I already have Amateur Radio License to use 144-146 MHz in my nation.

  • 0
    TI__Mastermind 29560 points
    The CC1120 can be used between 136.7 MHz and 160.0 MHz.

    Refer to the 169 MHz ref design as a starting point for your design.

    Regards, Richard
  • 0
    TI__Mastermind 39860 points
    CC1120 is fully functional in the frequency range 136.7 to 160 MHz. The reason why we state to contact TI is that we have not characterized the chip in this frequency range and that we do not have a reference design made for this band. However, we have a reference design for 169 MHz operation and this will also work at 136.7 to 160 MHz. Maybe a minor tweak of the component values is needed for optimum performance, but you will not loose much (if anything) using the 169 MHz design.
  • 0 in reply to Sverre
    Prodigy 150 points
    Thank you Sverre and Richard for helping me out. Is there a literature available on CC1120 RF Impedance matching network design and internal RF circuits parameters? I do not know now whether what components affect the performance. Also, is it possible to use TWO RF ports instead of ONE in the current design? Will that make CC1120 a full-duplex transceiver?
  • 0 in reply to Vishal Desai
    TI__Guru**** 317180 points

    - The literature we have on CC1120 impedance matching are the reference designs and the optimal impedance stated in the datasheet. Ideally we should have had a general document but various factors make this difficult:

    - Optimal impedance: For a given frequency both the PA and LNA have a given optimal load impedance/ source impedance. This is a impedance where both output power and sensitivity is good at the same time as the current consumption and harmonics are low.

    - For different frequency bands the filtering requirements are different.

    - CC1120 is a half duplex receiver. It is either in Rx or Tx.