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SI4712 Folha de dados(PDF) 5 Page - Silicon Laboratories |
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SI4712 Folha de dados(HTML) 5 Page - Silicon Laboratories |
5 / 14 page AN307 Rev. 0.2 5 4. Measuring RPS Algorithm Performance 4.1. Procedure In order to characterize the performance of the RPS algorithm at selecting good candidate stations, testing should be performed in several vehicles at different locations and with the transmitter at different locations inside the car. This testing uses a qualitative scale measurement of Good, Acceptable, and Poor to characterize the FM receiver performance. After the algorithm selects a candidate station, the car receiver is tuned to the station, the Si4712 is set to transmit on the station at 115 dBuV power and the subjective audio performance is recorded. In order to quantify the margin that the transmitter has on this particular station, the transmit power is reduced in 10 dB steps until the audio can no longer be received. This margin is defined as the amount of power reduction from 115 dBuV power that can be achieved while still maintaining a "Good" measurement. 4.2. Strong Signal Environment Figure 3 shows three RPS spectra measured with a Si4712 EVB with a 10 cm board stub antenna at a location with a direct line-of-sight view of several FM broadcast towers. This situation is representative of the strongest signal environment likely to be encountered. Using the minimum average RNL method with the filter size set to five channels to select candidate stations, four out of five showed good performance with the Si4712 positioned on the dashboard. Repeating the procedure with the Si4712 on the passenger seat yielded three out of five good candidate stations. Figure 3. Si4712 RPS Station Scan Results in a Strong Signal Environment Strong Signal Environm ent 0 10 20 30 40 50 60 70 8750 9250 9750 10250 10750 Dashboard (Scan 1) Good (Scan 1) Acceptable (Scan 1) Poor (Scan 1) Passenger Seat (Scan 2) Good (Scan 2) Acceptable (Scan 2) Poor (Scan 2) Search Band Boundary |
Nº de peça semelhante - SI4712 |
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Descrição semelhante - SI4712 |
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