Datasheet

 2001-2017 Microchip Technology Inc. DS20001685E-page 21
MCP6021/1R/2/3/4
4.11.2 OPTICAL DETECTOR AMPLIFIER
Figure 4-14 shows the MCP6021 operational amplifier
used as a transimpedance amplifier in a photo detector
circuit. The photo detector looks like a capacitive
current source, so the 100 k resistor gains the input
signal to a reasonable level. The 5.6 pF capacitor
stabilizes this circuit and produces a flat frequency
response with a bandwidth of 370 kHz.
FIGURE 4-14: Transimpedance Amplifier
for an Optical Detector.
Photo
Detector
100 pF
5.6 pF
100 k
V
DD
/2
MCP6021