MCM20027IBBL 查看數據表（PDF） - Motorola => Freescale
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MCM20027IBBL Datasheet PDF : 73 Pages
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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
ImageMOS
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 (VDD) and ground (VSS) 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.
RESET
GATE
TRANSFER
GATE 1
TRANSFER
GATE 2
SHARED
FLOATING
DIFFUSION
GATE
ROW SELECT
GATE
PHOTODIODE
ROW 1
PHOTODIODE
ROW2
Figure 2. Shared Floating Diffusion Pixel Architecture
TRANSFER GATE 1
TRANSFER GATE 2
RESET GATE
Tint
Tint
ROW SELECT GATE
SHARED FLOATING
DIFFUSION GATE
Trow
How it works?
T=0 T=1
T=2
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.
Trow
T=3 T=4 T=5 T=6
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 [Trow], @T=2 ,Transfer Gate 2 closes
(Off). This action causes Photodiode 2 to start charging.
When the integration (charging) of Photdiode 1 has
neared completion, @ T=3, the Reset Gate closes (Off).
MOTOROLA
Revision 8.4 - 24 Oct 2002 : MCM20027
8
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