MCM20027IBBL 查看數據表（PDF） - Motorola => Freescale

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MCM20027IBBL

Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC, digital programming, control, timing, and pixel correction features

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

ImageMOS

The charge off the well capacitance of Photodiode 1 is

then transfered to the Shared Floating Diffusion Gate

@ T=4 when Transfer Gate 1 opens (On). Also @T=4

the Shared Diffusion gate and the Row Select gate

opens (On). This action causes charge from the floating

diffusion to be read out as a Voltage value for that pixel

on Row 1. @T=5 the Row Select gate and the Floating

diffusion close (Off) while the Reset gate opens (On).

This is occurs in preparation of readout of Row 2.

When the integration (charging) of Photodiode 2 has

neared completion, the Reset Gate closes (Off) again.

The charge off the Well Capacitance of Photodiode 2 is

then transfered to the Shared Floating Diffusion Gate

@ T=6 when Transfer Gate 2 opens (On) and then the

same readout procedure as before occurs.

The nominal photoresponse of the MCM20027 is shown

in Figure 3

1

0 .9

0 .8

0 .7

0 .6

0 .5

0 .4

0 .3

0 .2

0 .1

0

400

-0 .1

R G B S R F , 4 0 0 to 1 1 0 0 n m

500

600

R E D P ix e ls

700

800

W a v e le n g th , n m

G r e e n - B P ix e ls

G r e e n - B P ix e ls

900

B lu e P ix e ls

1000

1100

Figure 3. MCM20027 Nominal spectral response

In addition to the imaging pixels, there are additional

pixels called dark and dummy pixels at the periphery of

the imaging section. The dark pixels are

covered by a light blocking shield rendering the pixels

underneath insensitive to photons. These pixels provide

the sensor means to measure the dark level offset

which is used downstream in the signal processing

chain to perform auto black level calibration. The dum-

my pixels are provided at the array’s periphery to elimi-

nate inexact measurements due to light piping into the

dark pixels adjacent to active pixels. The output of these

pixels should be discarded.

Electronic shuttering, also known as electronic expo-

sure timing in photographic terms, is a standard feature.

The pixel integration time can be widely varied from a

small fraction of a given frame readout time to the entire

frame time.

2.2 Color Separation and Fill Factor Enhancement

The MCM20027 family is offered with the option of

monolithic polymer color filter arrays (CFAs). The com-

bination of an extremely planarized process and propri-

atary color filter technology result in CFAs with superior

spectral and transmission properties. The standard op-

tion is a primary (RGB) “Bayer” pattern.

Applications requiring higher sensitivity can benefit from

the optional micro-lens arrays shown in Figure 5. The

lenslet arrays can improve the fill factor (aperture ratio)

of the sensor by 1.5-2x depending on the F number of

the main lens used in the camera system. Microlenses

yield greatest benefits when the main lens has a high F

number. As a caution, telecentric optical design is a re-

quirement due to the limited optical acceptance angle of

the lenslet. The optical acceptance angle is approxi-

mately 15 degrees (see figure 5a). Due to the lenslets

being placed in the same area/position over all the pho-

todiodes on the sensor, hence, care should be taken

when taking into consideration the telecentric design for

especially the outermost pixels. The fill factor of the pix-

els without microlenses is 32%. With Microlens the fill

factor improves to approximately 45% to 50%.

Revision 8.4 - 24 Oct 2002 : MCM20027

MOTOROLA

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