Equivalent Circuit for Photodetector under Reverse Bias

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Equivalent Circuit for Photodetector
underReverse Bias
represents the slope of the reverse-bias
- bulk semiconductor, contacts and the leads
W
lt
10
- junction, leads and packaging
, detector
capacitance
must be parallel,
must be series (dissipating)
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Equivalent Receiver Circuit
When combined with an amplifier
- biasing resistor
- input capacitance of amplifier
- input resistance of amplifier
- provide an input voltage
Amplifier frequency dependence
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Equivalent Circuit for Receiver
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SNR in voltage amplifier circuit
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Transimpedance Amplifier
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Ideal quantum limited Receiver
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High Input Resistance or Intefrating amplifier
(Voltage amplifier)
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Comparison of various terms of Noise sources
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Regeneration of digital signals
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Filter characteristics to minimize intersymbol
interference
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Quantum Limit to Detection
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