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RFM95 Datasheet(PDF) 47 Page - HOPE Microelectronics CO., Ltd. |
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RFM95 Datasheet(HTML) 47 Page - HOPE Microelectronics CO., Ltd. |
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47 / 121 page  Page 47 RFM95/96/97/98(W) Tel: + 86-755-82973805 Fax: + 86-755-82973550 E-mail: sales@hoperf.com http:/ / www.hoperf.com WIRELESS & SENSING PRELIMINARY DATASHEET 4.2.3.4. Frequency Error Indicator This frequency error indicator measures the frequency error between the programmed RF centre frequency and the carrier frequency of the modulated input signal to the receiver. When the FEI is performed, the frequency error is measured and the signed result is loaded in FeiValue in RegFei, in 2’s complement format. The time required for an FEI evaluation is 4 bit periods. To ensure correct operation of the FEI: The measurement must be launched during the reception of preamble. The sum of the frequency offset and the 20 dB signal bandwidth must be lower than the base band filter bandwidth. i.e. The whole modulated spectrum must be received. The 20 dB bandwidth of the signal can be evaluated as follows (double-side bandwidth): = × ⎛ + -------⎞ BW 20dB 2 ⎝FDEV 2 ⎠ The frequency error, in Hz, can be calculated with the following formula: FEI = F STEP × FeiValue RFM96/7/8 in Rx mode Preamble-modulated input signal Signal level > Sensitivity Set FeiStart = 1 FeiDone No = 1 Yes Read FeiValue Figure 16. FEI Process |
Similar Part No. - RFM95 |
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Similar Description - RFM95 |
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