Biomedical Engineering Reference
In-Depth Information
One set per pixel
Common to all pixels
Address switch
Electrometer
c
1
v
OUT
c
p
hu
c
j
Reset
switch
v
R
(a)
0 R
Common to all pixels
Electrometer
c
1
v
OUT
hu
c
j
Reset
switch
v
R
(b)
0 R
FIGURE 3.11
Schematic representation of photodiodes and CCD arrays: (a) photodiode read-out circuit;
(b) CCD read-out circuit.
No dynamic range data was given. Both types of PDs are shown in Figure
3.11 [21].
3.4 NoiseCharacterizationofPhotodetectors
As detailed in the Borsuk reference [22], “the linear dynamic range of PDs for
AO signal processing can be expressed as the ratio of the maximum charge
capacity of the diode-capacitor combination (pel) to the rms number of noise
electrons, both expressed here in units of charge:
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