64 lines
1.8 KiB
Matlab
64 lines
1.8 KiB
Matlab
classdef Photodiode
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%PGOTODIODE Summary of this class goes here
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% Detailed explanation goes here
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properties
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fsimu
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responsivity
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dark_current
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temperature
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end
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methods
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function obj = Photodiode(options)
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%PHOTODIODE Construct an instance of this class
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% Detailed explanation goes here
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arguments
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options.fsimu
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options.responsivity = 1;
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options.dark_current = 0;
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options.temperature = 20;
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end
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obj.fsimu = options.fsimu;
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obj.responsivity = options.responsivity;
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obj.dark_current = options.dark_current;
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obj.temperature = options.temperature;
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end
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function yout = process(obj,xin)
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%METHOD1 Summary of this method goes here
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% Detailed explanation goes here
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k = Constant.Boltzmann;
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T = obj.temperature + 273.15 ; %celsius + 273 = kelvin
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R = 50; %resistance of phdiode (50ohm is typical value)
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% Magnitude squared detection
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yout = sum( abs(xin) .^2*obj.responsivity, 2 ) ;
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% Shot Noise
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shot_noise = sqrt(k * obj.fsimu .* yout) .* randn(size(yout,1),1);
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yout = yout + shot_noise;
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% Thermal Noise
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therm_current_psd = (2 * k * T / R ) ; %squared
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Bw = obj.fsimu; %is this correct? shouldnt it be the bandwidth of the actual component? e.g. 70GHz?
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therm_noise_pow = therm_current_psd * 2 * Bw; %squared
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therm_noise = sqrt(therm_noise_pow) .* randn(size(yout,1),1);
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yout = yout + therm_noise;
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% Dark Current
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yout = yout + obj.dark_current ;
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end
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end
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end
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