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ANUAL
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7.4
Gain and Offset
Analog Gain in the ADC
The only analog Gain available in the is located at the sensor level, in the ADC
converter.
This “Preamp Gain” is in fact a variation of the ramp of the comparator of the ADC.
Then 3 Values are available : x1, x2 and x4. A gain x1 in a 12 bits conversion is equivalent
to x4 in 10 bits.
OUT
Pixel
X
Preamp
Gain
X
ROI
Gain
+
X
FFC
Offset Gain
X
FFC
Adjust
+
X
LUT
or
Contrast Exp
.
Offset Gain
FPGA
Sensor
X
Quarter (Tap)
Gains
Action on whole line
Action per pixel
Action per Sensor’s Quarter
X
Amp
Gain
x1
x2
x4
LSB
FWC
Comparator Ramps
at different Gains
Clamp (Black
Ref)
1024
electrons
4096
x1
x2
x4