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7.6
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
Sensor
X
Preamp
Gain
X
White Balance Gains
Red
Green
red
Green
blue
Blue
+
X
FFC
Offset Gain
X
WB
Adjust
FPGA
Sensor
X
Action on whole line
Action per pixel
Action per Color
Action per Quarter
X
Amp
Gain
X
X
X
Quarter Balance
Gain
x1
x2
x4
LSB
FWC
Comparator Ramps
at different Gains
Clamp (Black
Ref)
1024
electrons
4096
x1
x2
x4