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4.90 A reverse-biased photodiode is specified to have a dark current of 100 pA and a responsivity of 0.5 A/W. It is connected to the transresistance amplifier shown in Fig. P4.90. Assume an ideal op amp. (a) What is the reverse-bias voltage across the photodiode? (b) What is the output voltage vo with no illumination? (c) What is the output voltage vo with 10 µW of light incident on the photodiode? 250 kN +3 V• Figure P4.90 Hint: since we are assuming an ideal op amp, there is a virtual short-circuit between input terminals.

4.90 A reverse-biased photodiode is specified to have a dark current of 100 pA and a responsivity of 0.5 A/W. It is connected to the transresistance amplifier shown in Fig. P4.90. Assume an ideal op amp. (a) What is the reverse-bias voltage across the photodiode? (b) What is the output voltage vo with no illumination? (c) What is the output voltage vo with 10 µW of light incident on the photodiode? 250 kN +3 V• Figure P4.90 Hint: since we are assuming an ideal op amp, there is a virtual short-circuit between input terminals.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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4.90 A reverse-biased photodiode is specified to have a dark current of 100 pA and a responsivity of 0.5 A/W. It is connected to the transresistance amplifier shown in Fig. P4.90. Assume an ideal op amp. (a) What is the reverse-bias voltage across the photodiode? (b) What is the output voltage vo with no illumination? (c) What is the output voltage vo with 10 µW of light incident on the photodiode? 250 kN On o +3 V. Figure P4.90 Hint: since we are assuming an ideal op amp, there is a virtual short-circuit between input terminals.
Transcribed Image Text:4.90 A reverse-biased photodiode is specified to have a dark current of 100 pA and a responsivity of 0.5 A/W. It is connected to the transresistance amplifier shown in Fig. P4.90. Assume an ideal op amp. (a) What is the reverse-bias voltage across the photodiode? (b) What is the output voltage vo with no illumination? (c) What is the output voltage vo with 10 µW of light incident on the photodiode? 250 kN On o +3 V. Figure P4.90 Hint: since we are assuming an ideal op amp, there is a virtual short-circuit between input terminals.
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