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MCP6021 数据表(PDF) 21 Page - Microchip Technology |
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MCP6021 数据表(HTML) 21 Page - Microchip Technology |
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21 / 42 page ![]() © 2009 Microchip Technology Inc. DS21685D-page 21 MCP6021/1R/2/3/4 4.11.2 OPTICAL DETECTOR AMPLIFIER Figure 4-13 shows the MCP6021 op amp used as a transimpedance amplifier in a photo detector circuit. The photo detector looks like a capacitive current source, so the 100 k Ω 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 4-13: Transimpedance Amplifier for an Optical Detector. Photo Detector 100 pF 5.6 pF 100 k Ω VDD/2 MCP6021 |
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