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SX1230 Datasheet(PDF) 40 Page - Semtech Corporation |
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SX1230 Datasheet(HTML) 40 Page - Semtech Corporation |
40 / 46 page SX1230, Revision 2 May 2009 ©2008 Semtech Corp. SX1230 www.semtech.com Page 40 Integrated Transmitter IC ADVANCED COMMUNICATIONS & SENSING DATASHEET 9.4. SX1230 Baseband Filtering The following figure illustrates the effect of applying the baseband gaussian filtering to the modulating bitstream of the SX1230. This measurement was performed in the 868 MHz ISM band with the following settings: PPGM = 17 dBm, fRF = 868 MHz, Df = 50 kHz and Rb = 50 kbps (implies b=2). Here we see the occupied bandwidth reduced from 500 kHz for the unfiltered bit stream to 330 kHz with a filtering coefficient (BT) of 1. By increasing the filtering strength further to BT=0.3, the channel bandwidth for operation in the 868 MHz ISM band is reduced to below 200 kHz. Figure 31. The Influence of Gaussian Filtering on the Modulation Bandwidth (Wideband) 9.5. Adjacent Channel Power Modulation spectrum of the SX1230 measured in 100 Hz bandwidth is shown in the following three figures together with the integrated adjacent channel power for the modulation settings shown in the figure caption. Please note that all measurements were performed at 868 MHz, with an output power of 13 dBm. Please also note that the clock output was disabled. -70 -60 -50 -40 -30 -20 -10 0 10 -500 -400 -300 -200 -100 0 100 200 300 400 500 Offset from Centre Frequency (kHz) No Filtering 'BT = 1 'BT = 0.3 ETSI Limit |
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