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參數(shù)資料
| 型號： | MCM20027IBBL |
| 廠商： | MOTOROLA INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Color SXGA Digital Image Sensor 1280 x 1024 pixel progressive scan solid state image sensor with integrated CDS/PGA/ADC, digital programming, control |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, CQCC48 |
| 封裝： | CERAMIC, LCC-48 |
| 文件頁數(shù)： | 8/74頁 |
| 文件大?。?/td> | 973K |
| 代理商： | MCM20027IBBL |
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MOTOROLA
Revision 8.0 - 28 November 2001 : MCM20027
8
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
ImageMOS
The basic operation of the pixel relies on the photoelec-
tric effect where due to its physical properties silicon is
able to detect photons of light. The photons generate
electron-hole pairs in direct proportion to the intensity
and wavelength of the incident illumination. The appli-
cation of an appropriate bias allows the user to collect
the electrons and meter the charge in the form of a use-
ful parameter such as voltage.
The pixel architecture also requires all pixels in a row to
have common Reset , Transfer 1 and 2, Floating diffu-
sion and Row Select gate controls. In addition all pixels
have common supply (V
DD
) and ground (V
SS
) connec-
tions. An optimized cell architecture provides enhance-
ments such as noise reduction, fill factor maximizations,
and antiblooming. The use of pinned photodiodes (2)
and proprietary transfer gate devices in the photoele-
ments enables enhanced sensitivity in the entire visual
spectral range and a lag free operation.
Figure 2. Shared Floating Diffusion Pixel Architecture
How it works
In brief, initially during Integration @T=0, both Transfer
Gates 1 and 2 and the Reset Gate is Open (On-Active
High). Transfer Gate 1 then Closes (Off) @ T=1, there-
by allowing Photodiode 1 to charge its well capacitance.
At this time Photodiode 2 is held at Reset level by hav-
ing Transfer Gate 2 and the Reset Gate open (On). Af-
ter 1 Row Period [T
row
], @T=2 ,Transfer Gate 2 closes
(Off). This action causes Photodiode 2 to start charging.
When the integration (charging) of Photdiode 1 has
RESET
GATE
TRANSFER
GATE 1
PHOTODIODE
ROW 1
PHOTODIODE
ROW2
TRANSFER
GATE 2
SHARED
FLOATING
DIFFUSION
GATE
ROW SELECT
GATE
TRANSFER GATE 1
TRANSFER GATE 2
RESET GATE
ROW SELECT GATE
SHARED FLOATING
DIFFUSION GATE
T
int
T
int
T
row
T
row
T=0
T=1
T=2
T=4
T=5
T=6
T=3
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