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SL6649-I Arkusz danych(PDF) 10 Page - Zarlink Semiconductor Inc

Numer części SL6649-I
Szczegółowy opis  200MHz DIRECT CONVERSION FSK DATA RECEIVER
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Producent  ZARLINK [Zarlink Semiconductor Inc]
Strona internetowa  http://www.zarlink.com
Logo ZARLINK - Zarlink Semiconductor Inc

SL6649-I Arkusz danych(HTML) 10 Page - Zarlink Semiconductor Inc

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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


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