Photodiode Detectors
14.2 For Problem 14.1, make a sketch of the output voltage (across the resistor) versusthe incident optical power, for the range 0 to 100 _W. At what optical power does the detector response saturate?
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Photodiode Detectors
14.3 The photodiode of Problem 14.1 is removed from the circuit and operated in the photovoltaic mode. (a) Determine the shunt resistance assuming _ = 2. (b) Under open circuit conditions (no load resistor), what incident optical power will result in saturation of the output voltage? (c) A load resistor is now added to increase the dynamic range. What value of load resistance is needed so that optical powers up to 20 _W can be detected without saturation?
Photodiode Detectors
14.1 A photodiode with responsivity 0.3 A/W and dark current 2 nA is biased in the photoconductive mode, with a 9 V battery and 500 k_ resistor. Make a sketch like that of Fig. 14-3, showing the load line and the diode curves for incident powers from zero to 100 _W in steps of 20 _W. Circle the operating point for an incident power of 40 _W, and determine the approximate diode voltage from the graph.
Photodiode Detectors
A silicon photodiode is configured as shown in Fig. 14-18 with a 90 V bias voltage. The light to be detected has intensity 20 _W/cm2 and wavelength 920 nm. Relevant material properties for the detector are: absorption efficiency = 0.18, dark current density at room temperature = 15 nA/cm2, charge carrier mobility = 0.048 m2/Vs, and carrier saturation velocity = 105 m/s. At the applied bias voltage, it is known that the width of the depletion region is 0.2 mm....
Photodiode Detectors
Consider the transimpedance amplifier optical receiver shown in Fig. 14-19. Thefeedback resistance is 10 k_ and the feedback capacitance is 0.2 pF. The diode’s capacitance is 5 pF, and its responsivity is 0.5 A/W. The incident optical power is 0.5 mW. (a) Compute the signal current. (b) Compute the receiver’s output voltage. (c) Compute the receiver’s 3 dB electrical bandwidth. (d) Compute the rms thermal-noise current generated in the feedback resistor, assuming a temperature of 300K. (e) Assuming no dark...
Photodiode Detectors
A silicon solar cell has area 50 cm2, reverse-saturation current 0.75 _A, _ = 2. The electrical power generated in the 0.4 _ load resistor is 894 mW. Determine (a) The circuit current i, (b) the photocurrent i_, (c) the optical power incident on the cell, assuming that 80% is absorbed, and (d) the optical-to-electrical conversion efficiency of the cell. Assume the temperature remains near 300 K. Assume _ = 500 nm for the incident light.
photomultipler
A photomultipler with an S20 photocathode has a chain of eight dynodes that providea gain of 2 × 106 at the operating voltage of 2 kV. Light of wavelength 700nm and power 7 nW is incident on the photocathode. (a) For each electron incidenton one of the dynodes, determine the average number of electrons leaving thatdynode and moving on to the next one. (b) Determine the voltage difference betweendynodes, and the kinetic energy that the electrons pick up in moving...
Challenge Problem... The circuit to the left is constructed with a 1k2 resistor and a 1 mF capacitor. The input wavefor...
Challenge Problem... The circuit to the left is constructed with a 1k2 resistor and a 1 mF capacitor. The input waveform is shown below. i(t) in 2 V, (t) o2 13 A) Sketch a graph of the output voltage for this graph, starting att 0 and ending it once the RESISTOR has returned to an apparent steady state. Be sure to label important points and values. B) What is the value of output voltage at t 11 seconds? 12 seconds?...
can you help me do this? laser beam is switched on at time t-0, and is incident on a thermal power meter If the dete...
can you help me do this?
laser beam is switched on at time t-0, and is incident on a thermal power meter If the detector response time is 15 s, 2% of the "true" value? 13.3 A at what time will the reading come to withi
laser beam is switched on at time t-0, and is incident on a thermal power meter If the detector response time is 15 s, 2% of the "true" value? 13.3 A at what time...
33. (10 pt.) Refer to the diagram below. +5V Source: Circuit Lab procedure ENGR1182 a) Calculate...
33. (10 pt.) Refer to the diagram below. +5V Source: Circuit Lab procedure ENGR1182 a) Calculate total resistance. b) Calculate the electric potential difference for the 1000-Ω resistor. c) Calculate the power dissipated by the 100-2 resistor d) Calculate the power delivered by the source. e) What is the voltage across the 100-2 resistor? f) What is the voltage across the 1000-Q resistor? g) What is the current through the 100-2 resistor? h) What is the current through the 1000-Q...
In charged particle detectors we often use optical fibers to guide light emitted from charged particles...
In charged particle detectors we often use optical fibers to guide light emitted from charged particles (through scintillation or Cherenkov radiation) in one section of the detector to optically sensitive photodetector devices at another section of the detector, so that the emitted light can be detected, recorded and later analyzed. After entering the optical fiber (you can assume the light enters from a region of just air), the light is guided from one end of the optical fiber to the...
Challenge Problem... The circuit to the left is constructed with a 1k2 resistor and a 1 mF capacitor. The input waveform is shown below. i(t) in 2 V, (t) o2 13 A) Sketch a graph of the output voltage for this graph, starting att 0 and ending it once the RESISTOR has returned to an apparent steady state. Be sure to label important points and values. B) What is the value of output voltage at t 11 seconds? 12 seconds?...
can you help me do this?
laser beam is switched on at time t-0, and is incident on a thermal power meter If the detector response time is 15 s, 2% of the "true" value? 13.3 A at what time will the reading come to withi
laser beam is switched on at time t-0, and is incident on a thermal power meter If the detector response time is 15 s, 2% of the "true" value? 13.3 A at what time...
33. (10 pt.) Refer to the diagram below. +5V Source: Circuit Lab procedure ENGR1182 a) Calculate total resistance. b) Calculate the electric potential difference for the 1000-Ω resistor. c) Calculate the power dissipated by the 100-2 resistor d) Calculate the power delivered by the source. e) What is the voltage across the 100-2 resistor? f) What is the voltage across the 1000-Q resistor? g) What is the current through the 100-2 resistor? h) What is the current through the 1000-Q...
In charged particle detectors we often use optical fibers to guide light emitted from charged particles (through scintillation or Cherenkov radiation) in one section of the detector to optically sensitive photodetector devices at another section of the detector, so that the emitted light can be detected, recorded and later analyzed. After entering the optical fiber (you can assume the light enters from a region of just air), the light is guided from one end of the optical fiber to the...
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