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PI0512WS Datasheet(PDF) 3 Page - AMI SEMICONDUCTOR |
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PI0512WS Datasheet(HTML) 3 Page - AMI SEMICONDUCTOR |
3 / 8 page PI0512WS Page 3 of 8 – July 26, 2001 During normal operation, the impinging photons in or near the PN photodiode junction generate free charges that are collected and stored on the junction's depletion capacitance. Since on average a certain fraction of charge is generated and collected for each impinging photon, the number of collected charges will proportionally increase with light exposures. Figure 3 shows the stored signal charge as function of light exposure at a wavelength of 575 nm. The exposure is the product of the light intensity in nW/cm 2 and integration time in seconds. The charge accumulates linearly until reaching the saturation charge where the corresponding exposure is the saturation exposure. 0 10 20 30 40 50 60 70 0 50 100 150 200 Exposure (nJ/cm^2) Saturation Charge Saturation Exposure Figure 3. Stored signal charge as function of exposure at a wavelength of 575 nm. The responsivity is defined as ratio of saturation charge divided by saturation exposure. The measured typical responsivity of a photodiode is 3.3 ×10-4 C/J/cm2 at 575 nm. Figure 4 shows the predicted responsivity of the photodiodes as a function of wavelength. 0.0E+00 5.0E-05 1.0E-04 1.5E-04 2.0E-04 2.5E-04 3.0E-04 3.5E-04 4.0E-04 4.5E-04 5.0E-04 100 300 500 700 900 Wavelength (nm) QE=20% QE=40% QE=60% QE=80% Figure 4. Predicted spectral response. |
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