IBIS4-14000-M Datasheet, PDF (9/30 Pages) Cypress Semiconductor – 14-Megapixel CMOS Image Sensor

IBIS4-14000-M
IBIS4-14000-C
The pixel is a classic 3-transistor active pixel. The photodiode
is a high-fill-factor n-well/p-substrate diode. Separate power
supplies are foreseen: general power supply for the analog
image core (VDD), power supply for the reset line drivers
(VDDR) and a separate power supply for the pixel itself
(VDDARRAY).
2.2.2 FPN and PRNU
Fixed Pattern Noise correction is done on chip with the
so-called Double Sampling technique. The pixel is readout
and this voltage value is sampled on capacitor SHS. After read
out the pixel is reset again and this value is sampled by SHR.
Both sample and reset values of each pixel are subtracted in
the column amplifiers to subtract FPN. Raw images taken by
the sensor typically feature a residual (local) FPN of 0.11%
RMS of the saturation voltage.
The Photo Response Non Uniformity (PRNU), caused by
mismatch of photodiode node capacitances, is not corrected
on-chip. Measurements indicate that the typical PRNU is <1%
RMS of the signal level.
2.2.3 Color Filter Array (CFA)
Figure 6. Color Filter Arrangement on the Pixels
The IBIS4-14000 can also be processed with a Bayer RGB
color pattern. Pixel (0,0) has a green filter and is situated on a
green-red row.
Figure 7 shows the response of the color filter array as
function of the wavelength. Note that this response curve
includes the optical cross talk and the NIR filter of the color
glass lid as well (see Section 4.5 for response of the color
glass lid).
2.2.4 Output Stage
Unity gain buffers are implemented as output amplifiers.
These amplifiers can be directly DC-coupled to the
analog-digital converter or coupled to an external program-
mable gain amplifier.
The (dark reference) offset of the output signal is adjustable
between 1.7V and 3V. The amplifier output signal is negative
going with increasing light levels, with a max. amplitude of
1.2V (at 4V reset voltage, in hard reset mode). The output
signal range of the output amplifiers is between 0.5V and 3V.
Document #: 38-05709 Rev. *A
Figure 7. Color Filter Response Curve
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