3. (a) Calculate the bandwidth of the silicon photodiode in Figure Q3. Include a diagram of the equivalent circuit that

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3 A Calculate The Bandwidth Of The Silicon Photodiode In Figure Q3 Include A Diagram Of The Equivalent Circuit That 1 (93.74 KiB) Viewed 13 times

3. (a) Calculate the bandwidth of the silicon photodiode in Figure Q3. Include a diagram of the equivalent circuit that allows you to determine TRC. Comment on the relative contribution between the two time constants TR and TRC. Figure Q3 Photodiode schematic and specifications. AR Coating SIO2 Anode SIN P Active Area Depletion Region P/N Junction Bulk N Type N+ Back Contact Diffusion Back Metalisation Cathode Depletion Region Width (wɑ) 1 um Photodiode Shape Square Photodiode length 0.55 mm Silicon relative permittivity 11.68 Saturation Velocity (Vs) 3x105 8.85x10-12 Permittivity of free space Load Impedance Responsivity @650nm 50Ω 0.65 AW-1 (b) The bandwidth of this device could be increased if a PIN configuration was used. Explain why adding an intrinsic silicon layer can improve the bandwidth and calculate the layer thickness needed to obtain a bandwidth of 2.5GHz if only TRC is considered. (c) For your choice of wd in Q3(b) calculate the actual bandwidth if both TR and TRC are considered. Comment on the relative contributions of the time constants for this device. [9] [5] [4]