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CC1020: How to set ACP

Part Number: CC1020

Hi TI.

I am working with CC1020 using SmartRF studio v6.

How do I change the ACP settings?

BR

Anders Lange

  • Sorry, but I do not fully understand the question so a few general comments only:

    ACP (adjacent channel power) depends on the phase noise, modulation format and PHY parameters such as symbol rate and deviation. Phase noise is defined by the external loop filter component values, which you get from SmartRF Studio. Modulation format and PHY parameters are entered in Studio GUI.

    In addition, make sure you set up the measuring equipment correctly; channel spacing, channel BW, RBW, VBW, detector- and trace mode. You did not specify any standard, but if this is for Europe refer to EN300 220 V3.1.1
  • The original question was like this:  

    I have problem with Adjacent Channel Power (ACP), which do not comply with test standard ETSI EN 300-220.

    I have an external PA to amplify to 27dBm, on 444MHz with 25kHz channel spacing. 4.8k Baud rate, 3.3k frequency deviation. Is there any specific setting can be used to reduce the phase noise?

    I tried with both loop filter values (for 12.5kHz and 25kHz channel spacing) from the datasheet. 

    Is it possible to comply ACP with CC1020 + 27dB power amplifier?

    BR

    Kawa Rahman 

    kar@kamstrup.com

  • The ETSI ACP requirement for 25 kHz channel spacing is -37 dBm. Assuming +27 dBm output power the ACPR is then 27 + 37 = 64 dBc.

    According to the CC1020 data sheet ACPR is 52 dBc for 4.8 kbps, +/-2.475 kHz deviation @433 MHz, 25 kHz channel spacing, measured in a 17 kHz BW.

    There are no register settings nor external components that can be tweaked to get below 52 dBc when using CC1020.