NOIL1SN3000A
Figure 7. Column Multiplexing Scheme
6T Pixel Architecture
The pixel architecture shown in Figure 8 features the
global shutter combined with a high sensitivity and good
parasitic light sensitivity (PLS). This pixel architecture is
designed in an 8 m m x 8 m m pixel pitch and designed with a
large fill factor to meet the electro-optical specifications as
shown in Table 2 on page 3.
Analog Front End
Programmable Gain Amplifiers(PGA)
LUPA3000 includes analog PGA (before each of the 64
ADCs) to maximize sensor array signal levels to the ADC
dynamic range. Six gain settings are available through the
SPI register interface to allow 1x, 1.5x, 2x, 2.25x, 3x, or 4x
gain.
reset
sample
Vmem
2.5 - 3.3V
Row sel.
The entire AFE signal processing and ADC concept for
the LUPA3000 chip is shown in Figure 10.
The analog signal processing frontend circuits provide
programmable gain level. They also convert the single
ended pixel voltage from each column (as referenced to the
precharge
Figure 8. Pixel Schematic
user programmable black or dark reference level) to a
unipolar differential signal for the PGA stages. This is
followed by a conversion to a bipolar differential signal to
maximize the ADC dynamic range and noise immunity.
Figure 9 displays the electro-optical response of the
LUPA3000 6T pixels at V DD = 2.5 V.
Figure 9. Electro ? optical Response of LUPA3000 Pixel
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