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 current, and an ideal (noiseless) amplifier, compute the output SNR, expressed in dB. The actual SNR will be somewhat lower due to noise introduced by the amplifier.
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Consider a typical optical receiver that contains a InGaAs pin photodiode, a load resistor, and an amplifier. The receiver has the following parameters at the wavelength 1.15e-5 m: The dark current is 5.0 nA, the quantum efficiency is 0.85, and the surface leakage current is negligible. The incident optical power is 3 mW, load resistance is 50 ohm, and the effective noise bandwidth of the receiver is 1 GHz. (1) Determine the photocurrent Iph . (2) Calculate...
A Si photodiode with a 1 mm^2 area has a dark current i_drk = 0.5 nA and a responsivity, R = 0.2 A/W at 500 nm. It is operated with (reverse) bias. Assume B_3dB = 10 Hz electrical bandwidth and 500 nm monochromatic light. Do NOT include amplifier Johnson noise. (a) What is its quantum efficiency, ηqe? (b) What is its dark current noise? (c) What is the photon equivalent of the dark current noise? (d) What is the noise...
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....
Yes, this is one problem. Please solve ALL PARTS. Guaranteed thumbs up for the person who solves it. 3 1. Photodiode amplifier circuit You are designinga CF photosensor circuit for a light detection and ranging LiDAR) system in autonomous vehicles. The circuit utilizes a transimpedance amplifier to convert low-level RF photodiode current signal to a usable voltage output. It consists of a photodiode, an amplifier, and feedback capacitor/resistor pair as shown in Figure 1. We will derive simple equations to...