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SL2017 Datasheet(PDF) 9 Page - Mitel Networks Corporation |
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SL2017 Datasheet(HTML) 9 Page - Mitel Networks Corporation |
9 / 17 page 9 SL2017 Measurement of Phase Noise. This is best measured by looking at the IF output of the SL2017. The IF should be fed to a spectrum analyser, where it can be interpreted. There are two common methods of doing this: a) using phase noise analysis software (such a HP85671A phase noise program) b) direct measurement of the noise floor at the chosen offset frequency, and conversion to a dBc/Hz figure. Since method a) will depend on the software used, a description of method b) will be given only. To measure phase noise at 10kHz offset: a) tune the centre frequency of the spectrum analyser to the IF - e.g. 479.5MHz b) Set the span initially wide (10MHz or greater). Gradually reduce this until it is set to 50kHz or less, taking care to ensure that the centre frequency of the display matches the IF peak. c) perform a peak search d) set marker delta to 10kHz e) set video averaging ON to ensure that a representative measurement of the noise floor at the chosen offset frequency is made. f) record the level of noise at the 10kHz offset compared to the peak IF level (in dBc). Measurement of Conversion Gain (from a 50 Ω source) a) Connect an RF signal generator to the RF input to the SL2017. b) Connect an IF output to a spectrum analyser. c) Feed the SL2017 with the appropriate signal level, depending on AGC setting, required output, etc. d) Note the relative difference in the input and IF level in dB. This is the conversion gain of the device. For increased accuracy, the input signal level should also be checked with a spectrum analyser, since any level measurement errors that exist within the analyser will then be relative, rather than literal. The AGC voltage may be varied and conversion gain measured at different AGC voltages. Care must be taken to ensure that the LO is stable, since any instability will reduce the averaged peak LO value, thus giving a falsely low phase noise reading. g) convert the measured reading to a 1Hz bandwidth. e.g. A measured phase noise of -50dBc/1kHz bandwidth (RBW of 1kHz) corresponds to -80dBc/Hz. Since noise floor must be reduced by the ratio of the two bandwidths i.e. 10 log 1kHz/1Hz = 30dB. |
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