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Update April

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This commit is contained in:
Silas Oettinghaus
2024-04-19 10:31:36 +02:00
parent 025498d120
commit ed17953407
30 changed files with 3261 additions and 1580 deletions
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28
Classes/03_receive/Photodiode.m
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@@ -8,6 +8,9 @@ classdef Photodiode
dark_current
temperature
randomkey
randomstream
end
methods
@@ -18,14 +21,16 @@ classdef Photodiode
options.fsimu
options.responsivity = 1;
options.dark_current = 0;
options.temperature = 20;
options.temperature = 20;
options.randomkey = 1;
end
obj.fsimu = options.fsimu;
obj.responsivity = options.responsivity;
obj.dark_current = options.dark_current;
obj.temperature = options.temperature;
fn = fieldnames(options);
for l = 1:numel(fn)
obj.(fn{l}) = options.(fn{l});
end
obj.randomstream = RandStream('mlfg6331_64','Seed',obj.randomkey);
end
function signalclass_out = process(obj,signalclass_in)
@@ -50,15 +55,16 @@ classdef Photodiode
% Detailed explanation goes here
k = Constant.Boltzmann;
q = Constant.ElementaryCharge;
T = obj.temperature + 273.15 ; %celsius + 273 = kelvin
R = 50; %resistance of phdiode (50ohm is typical value)
% Magnitude squared detection
yout = sum( abs(xin) .^2*obj.responsivity, 2 ) ;
% Magnitude squared detection (sum over pols)
yout = sum( abs(xin) .^2 * obj.responsivity, 2 ) ;
% Shot Noise
shot_noise = sqrt(k * obj.fsimu .* yout) .* randn(size(yout,1),1);
shot_noise = sqrt(q * obj.fsimu .* yout) .* randn(obj.randomstream,size(yout,1),1);
yout = yout + shot_noise;
@@ -68,7 +74,7 @@ classdef Photodiode
Bw = obj.fsimu; %is this correct? shouldnt it be the bandwidth of the actual component? e.g. 70GHz?
therm_noise_pow = therm_current_psd * 2 * Bw; %squared
therm_noise = sqrt(therm_noise_pow) .* randn(size(yout,1),1);
therm_noise = sqrt(therm_noise_pow) .* randn(obj.randomstream,size(yout,1),1);
yout = yout + therm_noise;

27
Classes/03_receive/Scope.m
View File

@@ -17,8 +17,10 @@ classdef Scope
fixed_delay %fix the delay of the filter or use minimal delay for kausal system
delay %specify a fixed delay of the filter
lpf_active
filtertype
lpf_bw
H_lpf
block_dc
@@ -47,8 +49,10 @@ classdef Scope
options.fixed_delay = 0;
options.delay = 0;
options.lpf_active = 0;
options.filtertype = filtertypes.bessel_bilin;
options.lpf_bw = 120e9;
options.H_lpf;
options.block_dc = 1;
end
@@ -65,12 +69,27 @@ classdef Scope
function signalclass_out = process(obj,signalclass_in)
% apply LPF
lpf = Filter('filtdegree',3,"f_cutoff",obj.lpf_bw,"fsamp",obj.fsimu,"filterType",obj.filtertype);
signalclass_in = lpf.process(signalclass_in);
% actual processing of the signal
signalclass_in.signal = obj.process_(signalclass_in.signal);
signalclass_in.fs = obj.fadc;
% apply LPF
% 4. Apply LPF on the signal
assert (signalclass_in.fs == obj.H_lpf.fs)
if obj.lpf_active
if isa(obj.H_lpf,'Filter')
%4.A) user already specified a complete filter class when
% initializing the AWG module
signalclass_in = obj.H_lpf.process(signalclass_in);
else
%4.B) just use a standard filter
obj.H_lpf = Filter('filtdegree',3,"f_cutoff",obj.lpf_bw,"fsamp",obj.fsimu,"filterType",obj.filtertype);
signalclass_in = obj.H_lpf.process(signalclass_in);
end
end
% cast the electrical signal to information signal
signalclass_in = Informationsignal(signalclass_in,"fs",obj.fadc,"logbook",signalclass_in.logbook);
% append to logbook
lbdesc = ['Scope '];