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Si Biased Detector Chapter 5: Common Operating Circuits
Rev I, September 28, 2017 Page 9
Chapter 5 Common Operating Circuits
Figure 2 Basic DET Circuit
The DET Series Detectors are designed according the circuit depicted above. The
detector is reverse biased to produce a linear response with applied input light.
The photocurrent generated is based upon the incident light and wavelength and
can be viewed on the oscilloscope by attaching a load resistance on the output.
The function of the RC Filter is to filter any high frequency noise from the input
supply which may contribute to a noisy output.
Figure 3 Amplified Detector
On/Off
Switch
Protection Diode Photodetector
V
BAT
RC Filter External
Resistor
1 k
Ω
Capacitor 0.1 µF
V Bias
BNC
GND
GND
Battery
Voltage
Regulator
R
LOAD
Photodetector
Transimpedance Amp
Out
Feedback
R
F
A
B
-V
BNC
GND
GND GND
R
LOAD