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SL6649-I Arkusz danych(PDF) 10 Page - Zarlink Semiconductor Inc |
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SL6649-I Arkusz danych(HTML) 10 Page - Zarlink Semiconductor Inc |
10 / 14 page SL6649-1 9 METHOD FOR THE MEASUREMENT OF SENSITIVITY ON THE SL6649-1 RECEIVER The method used by GEC Plessey Semiconductors in the measurement of terminal sensitivity is essentially the same as that described in the CEPT Res 2 Specification. This method requires the following equipment: 1. A signal generator e.g. HP8640 2. A pocsag encoder 3. A pocsag decoder e.g. MV6639 4. An SL6649-1 Demo Board. 5. An interference free low impedance P.S.U. (V CC 1 and V CC 2 must be separate supplies and there must be at least 0.7V difference between them). Recommended supply configurations are shown in Fig. 13. The test equipment and D.U.T. are set up as shown in Figure 11. The R.F. frequency is set to the nominal L.O. frequency of the receiver and the peak deviation is set to 4.5kHz. Care must be taken to avoid long power supply leads and any ground loops. Any interference from the decoder will be reduced by the insertion of a high value resistor R1 (100K Ω) between the receiver data output and the decoder input. Figure 11: Test System The generator output level is reduced successively until the decoder responds just 4 out of 5 times to the encoder signal. This output level is then recorded as the sensitivity threshold of the receiver. We find that this threshold correlates to a bit error rate of 1 in 30. The data output waveforms for an input level which produces a B.E.R. of 1 in 30 and for input levels 2dB above and below this level, are shown below (square wave input). It can be seen that the edge jitter increases dramatically at signal levels below the sensitivity threshold of -127dBm. Typical waveforms that can be seen on an oscilloscope around the sensitivity threshold level are shown in Figure 12. NB. In performing the sensitivity measurement great care should be taken in preventing coupling between test leads. Figure 12: Waveform at Data O/P |
Podobny numer części - SL6649-I |
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Podobny opis - SL6649-I |
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