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CC1101-Q1 measurement RSSI

Tomoaki Yoshida
Expert 2200 points

Hi,

Our customers are thinking of the measurement of RSSI.

Since there are some necessary information, please let me know.

#1

Figure 3-12 of the data sheet P.40 is a typical, could you provide MIN and MAX value?

#2

In the RSSI accuracy of RSSI Section Characteristics of data sheet P.11, there is a only typical value at 310MHz.

Could you provide MIN, MAX value and the data at 125 deg?

If possible, I want also data of 433MHz.

#3

Could you provide the measurement data of the actual value of the above RSSI variation?

#4

TX to RX switch and RX to TX swirch in datasheet p.16have been described only TYP value,
could you provide the minimum and maximum value?

Best regards,

Tomoaki Yoshida

  • 0
    TI__Guru**** 317180 points
    RSSI is not production tested and we can therefore not state min/ max values in the datasheet. Based on some old lab measurements I found the RSSI has a variation of up to +/-4 dB over voltage/ temperature and process. The accuracy is the same over the different frequency bands.
  • 0 in reply to TER
    TI__Mastermind 29570 points
    Hi Tomoaki,

    RSSI variation of +/- 4 dB is when measuring conducted.

    For Over-The-Air RSSI measurements then multi-path propagation nulls can also effect the RSSI reading.

    Regards, Richard
  • 0 in reply to RGW
    Expert 2200 points

    Dear Richard,

    Thank you for your reply.

    Aithough I understood that the RSSI offset can not be defined, can I know the RSSI offset by actual EVM?

    I understand that RSSI variation of +/- 4 dB, do you know which is dominant or of the change in the offset and the slope of the change?

    If possible, I would like to know the maximum slope and minimum one.

    Best regards,

    Tomoaki yoshida

  • 0 in reply to Tomoaki Yoshida
    TI__Guru**** 317180 points
    The slope does not have large variation, but the slope can change some as a function of input level. It is the offset eq the distance from the ideal slope that has some variation and the total variation is a function of chip to chip variation but also dependent on input level.
  • 0 in reply to TER
    Expert 2200 points

    Hi TER,

    Thank you for your reply.

    Is there any data was shown the change in slope due to the input?

    Althought we are considering to cancel the offset each device, the slope can not be canceled.

    I want to know how much of the range of slope.

    Best regards,

    Tomoaki Yoshida