Teledyne Princeton Instruments Lansis, System Manual

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50 Lansis
®
System Manual Issue 1
EAR99 Technology Subject to Restrictions Contained on the Cover Page.
Readout of the CCD begins with the simultaneous shifting of all pixels one row toward
the Shift Register which is a single row of pixels along the edge of the CCD. The Shift
Register is not sensitive to light and is only used to store charge during readout. See
Figure 9-2 .
Figure 9-2: Full Frame Readout: One Row of Charge Shifted into Shift Register
NOTE:
Typically, each pixel within the Shift Register can store up to
twice as much charge as pixels within the CCD imaging
area.
Once one row of charge has been shifted into the Shift Register, the charge is then
shifted by one pixel toward the corresponding Output Node where it is then digitized.
See
Figure 9-3 .
Figure 9-3: Full Frame Readout: One Pixel of Charge Shifted to Output Node
Once the charge within all of the Shift Register’s pixels has been shifted out and
digitized, the next row of charge is shifted vertically into the shift register where it is
then shifted, pixel by pixel into the Output Node and digitized. This process continues
until all accumulated charge in the CCD has been shifted out and digitized. The result is
zero charge stored within each CCD pixel and the array is immediately ready for the
next exposure.
A1 B1 C1 F1 D1 E1
A2 B2 C2 D2 E2 F2
A3 B3 C3 D3 E3 F3
A4 B4 C4 D4 E4 F4
A5 B5 C5 D5 E5 F5
B6 C6 A6 F6 D6 E6
Amplifier
CCD
Image
Area
Shift Register
Output
Node
441
1-01
74_
0
0
6
3
B1 C1 A1 F1 D1 E1
A2 B2 C2 D2 E2 F2
A3 B3 C3 D3 E3 F3
A4 B4 C4 D4 E4 F4
A5 B5 C5 D5 E5 F5
B6 C6 A6 F6 D6 E6
Amplifier
CCD
Image
Area
Shift Register
Output
Node
44
11
-0
17
4
_
0
0
6
4