Ch11Sec6_1

Ch11Sec6_1 - THE FIBER FORUM Fiber Optic Communications PRESENTED BY Dr JOSEPH C PALAIS Dr Joseph C Palais 11.6 1 Section 11.6 Receiver Circuit

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Dr. Joseph C. Palais 11.6 1 THE FIBER FORUM Fiber Optic Communications Dr. JOSEPH C. PALAIS PRESENTED BY
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Dr. Joseph C. Palais 11.6 2 Section 11.6 Receiver Circuit Design
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Dr. Joseph C. Palais 11.6 3 Considerations in Receiver Design 1. Low noise (this is the same as high sensitivity) 2. Bandwidth 3. Dynamic range Three receiver designs follow: 1. Photodiode, load-resistor, transistor amplifier 2. High-impedance amplifier 3. Transimpedance amplifier
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Dr. Joseph C. Palais 11.6 4 R L V B P + i - V CC b 11.6.1 Bipolar Transistor and FET Amplifiers Photodiode-Load Resistor-Transistor Amplifier (Biasing circuits not shown) Output
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Dr. Joseph C. Palais 11.6 5 Properties Large bandwidth if R L small Low noise at high frequencies (> 50 MHz) Transistor input resistance moderate (~ k Ω29 Limited dynamic range P max = V B / ρ R L The dynamic range is large for small load resistance. This reduces receiver sensitivity, however.
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Dr. Joseph C. Palais 11.6 6 Bandwidth f 3-dB = 1/2 π R T
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This note was uploaded on 01/26/2011 for the course EEE 546 taught by Professor Palais during the Spring '10 term at ASU.

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Ch11Sec6_1 - THE FIBER FORUM Fiber Optic Communications PRESENTED BY Dr JOSEPH C PALAIS Dr Joseph C Palais 11.6 1 Section 11.6 Receiver Circuit

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