Biomedical Engineering Reference
In-Depth Information
C1
10n
2
3
−
1
R1 3.3k
R2
3.3k
TL084AC
IN
OUT
OUT
−
7
6
5
IN
TL082MJG
+
C2
R3
C1
R1
1.8k
10n
27k
100p
R4
47k
(a)
(b)
R1
C1
100k
2,2u
13
−
14
12
R1
10k
+
OUT
IN
TL084AC
R2
1.8k
(c)
(d)
FIGURE 16.8
Electronics for the photosensors: (a) voltage follower, (b) low-pass filter, (c) high-pass filter, and (d) signal
amplifier.
50
180
40
30
90
20
10
0
0
10
20
90
30
40
180
50
10
0
10
1
10
2
10
3
10
4
10
0
10
1
10
2
10
3
10
4
Frequency (Hz)
Frequency (Hz)
FIGURE 16.9
Frequency response of signal conditioning (low-pass filter, high-pass filter, and amplifier) including (a) magni-
tude and (b) phase.
The PERs of each BR type were measured for the color-sensitive array. The results pre-
sented in Figure 16.12 show that the response amplitudes were considerably lower than
the ones generated by the gray-scale array elements. This holds even for the wild-type
elements. The explanation to the degraded responses was low conductance of the gold
layer, which was confirmed by conductivity measurements.
The quality of individual elements in the imaging arrays can be determined by meas-
uring the PER for each element. Uniformity of the PER was determined by measuring
one array element at a time. The average amplitudes for sets of 20 measurements per
