Biomedical Engineering Reference
In-Depth Information
Ground
To frequency
counter
Sink Electrode
R
Output
Periodic
Square
Waveform
Schmitt Trigger
(a)
10 K
Output
150 pF
74C14
+5 V
Droplet
1N914
1N5231
5.1 V
5 K
1N914
Gnd
( b)
Microscope &
CCD camera
Capacitive
sensing
circuit
Chip-
under-test
(c)
Figure 4.2
Capacitive sensing circuit: (a) outline [67]; (b) detail circuit design; (c) experimental setup.
outcome for the single-droplet scan-like test provides no diagnostic informa-
tion. If any cell in the array is faulty, the capacitive sensing circuit will have no
readout; however, it is not possible to identify the location of the faulty cell.
The preceding problems can be tackled by carrying out the scan-like
test in parallel using multiple droplets. Each column/row in the array is
 
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