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Information about AGC and LNA of CC1101

Hi,

I need some information about AGC and in LNA of CC1101 that I didn't find in the datasheet or others documentations.

  1. AGCCTRL2 allows to control the LNA and LNA2.Where is the LNA2 in the block diagram?
  2. The AGCCTRL0 allows freezing both the analog gain and the digital gain or only the analog gain. What are the analog and digital gain values when they are frozen? Can they be changed to another value? Can they be read?

Regards,

Julien

1 Reply

  • 1) The 2 LNA's are in series and is shown as one component in the block diagram

    2) To manually set the gain set AGCCTRL0.AGC_FREEZE = 3 and set gain in register AGCTEST

    Bit

    Field Name

    Reset

    R/W

    Description

    7:6

    LNA_PD_GAIN[1:0]

    0 (00)

    R/W

    LNA gain setting (00: maximum, 10: minimum)

    5:3

    LNA2_CURRENT[2:0]

    7 (111)

    R/W

    LNA2 gain setting (000: minimum, 111: maximum)

    2:0

    DVGA_GAIN[2:0]

    7 (111)

    R/W

    Digital gain setting

    Note: not recommended to manually set the gain. Leave the AGC free-running