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SlicerThreshold = ? ---------------------------------------------------------------------------------------------------------- ? -
Si4312
3.5. RATIO Selection Used for the Slicer Threshold Calculation Window
In OOK modulation, many different encoding schemes exist, which can result in variable ON and OFF times as
seen in the example data waveforms shown in Figure 4. In order to determine the proper slicer threshold used for
demodulating the OOK signal into digital data, the Si4312 must sample an "ON" and "OFF" event in a time window
called the threshold calculation window. The samples during the "ON" time will determine the ON voltage, and the
samples during the "OFF" time will determine the OFF voltage. These voltages are used to determine the slicer
threshold voltage as follows:
Max_ON_Voltage + Min_OFF_Voltage
2
Defining the BT variable from the last section as the ON time and
----------- -
RATIO = OFF
ON
then, the threshold calculation window is calculated as follows:
Threshold Calculation Window = 1.25 ? ? ON + OFF ?
= 1.25 ? ? BT + BT ? RATIO ?
= 1.25 ? BT ? RATIO + 1 ?
The threshold calculation window is 1.25 times longer than the ON plus OFF times for margin to allow sampling of
both ON and OFF times. Figure 5 shows a graph of the threshold calculation window.
Digital Data
“1”
“0”
“1”
“1”
PPM
Encoding
OOK
1000 us
ON voltage
100 us
OFF voltage
Waveform
Threshold Calculation Window
Figure 5. Example of the Threshold Calculation
Ratio is a unit-less multiplier that relates the OFF time to the ON time. The Si4312 defines two constants for RATIO
as shown in Table 10 based on the logic level of pin 5.
Table 10. RATIO Constants Based on Logic Level of Pin 5
10
Pin 5
0
1
Rev. 0.5
RATIO
5
10
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