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CC1120 vs. Silicon Labs for better Sensitivity

Saycoda
Expert 1580 points
Other Parts Discussed in Thread: CC1101, CC1120

We currently have a production transceiver product using the TI CC1101 with the following settings;

Freq=905Mhz, Modulation=GFSK, Data Rate=115Kb, Freq Deviation=47.7Khz, PKt Size=63 bytes,

Channel Spacing=200Mhz, Rx BW=200Khz, Whitening Enabled, TX Power=+11dBm. We are seeing sensitivity numbers of about -85dBm. This product is also FCC compliant.

We are currently developing a new product which requires much better sensitive, and less power consumption. Our packet size will be similar, and we can afford to lower the Data Rate. We are considering the TI CC1120 or the Silicon Labs Si446x line.

What new enhancements does the CC1120 yield, that can get us there? Are there any recommendations for changing the RF parameters to realize better sensitivity at lower power consumption? Any first-hand experience that you can share would be appreciated.

Thanks in advance.

  • 0
    TI__Guru**** 317180 points
    For 1 % PER, 8 byte payload CC1120 will have a sensitivity equal to -102 dBm for 100 kbps.

    CC1120 has a lot of features that can be used to give you better system performance. For Rx current consumption: How often will the receiver be in Rx? How long preamble could you use? See www.ti.com/.../swra428a.pdf for some details here.

    What is the power consumption target for which use of the radio?
  • 0 in reply to TER
    Expert 1580 points
    Why is it that TI states it's sensitivity @ 1% PER, and Silicon Labs states theirs as 0.1%? Do you think the Si446x outperforms the CC1120 in sensitivity and power consumption?
  • 0 in reply to Saycoda
    TI__Guru**** 317180 points
    SiLabs use 0.1% BER, the relationship is PER=1-(1-BER)^n where n is the payload in bits.

    If you read the the SiLabs datasheet carefully you will see that the power levels stated are at the pins of the chip. Through balun and filter there will be some loss. We always state the sensitivity as the power at the antenna input. Hence comparing the sensitivity numbers directly is difficult since there are some unknown in SiLabs' numbers. As far as I can see the sensitivity is more or less equal for the two parts.

    To compare power consumption I need to know how often you want to send/ transmitt, type of network etc.