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#pragma once
#include <systemc.h>
#include <fstream>
#include <random>
#include <optical_output_port.h>
#include <optical_signal.h>
#include "specs.h"
#include "spx_module.h"
// TODO: rename to photodetector
class Detector : public spx_module {
public:
// Ports
spx::oa_port_in_type p_in;
spx::ea_port_out_type p_readout; // TODO: divide into cathode and anode
double m_cur_readout;
double m_cur_readout_no_interf;
// Input memory for multi-wavelength purposes
std::map<uint32_t,OpticalSignal::field_type> m_memory_in;
// Detector enable signal
spx::ed_signal_type enable;
// Member variables
double m_responsivity_A_W;
double m_darkCurrent_A;
double m_opFreq_Hz;
double m_temp_K;
double m_equivR_Ohm;
double m_iTIA; // A/sqrt(Hz)
bool m_noiseBypass;
double m_sampling_time;
// if each photodiode has an independent RNG device
std::default_random_engine m_rngGen;
std::normal_distribution<double> m_rngDist;
sc_event m_event_manual_trigger;
// Init all parameters
void init();
// Function that generates the noise applied to the output of this module
double noise_gen(const double &noiseless_readout);
double wavelength_dependent_responsivity(const double &wavelength);
// Processes
void on_port_in_changed();
void on_time_tick();
virtual void trace(sc_trace_file *Tf) const
{
sc_trace(Tf, m_cur_readout, (string(name()) + ".readout").c_str());
sc_trace(Tf, m_cur_readout_no_interf, (string(name()) + ".readout_no_interference").c_str());
}
// Constructor
Detector(sc_module_name name,
double responsivity_A_W = 1,
double darkCurrent_A = 0, // 100e-12 is an OK value
bool noiseBypass = true,
double opFreq_Hz = 1e9,
double temp_K = 300,
double equivR_Ohm = 400,
double iTIA = 10e-12,
double sampling_time = 1e-12)
: spx_module(name)
, m_responsivity_A_W(responsivity_A_W)
, m_darkCurrent_A(darkCurrent_A)
, m_opFreq_Hz(opFreq_Hz)
, m_temp_K(temp_K)
, m_equivR_Ohm(equivR_Ohm)
, m_iTIA(iTIA)
, m_noiseBypass(noiseBypass)
, m_sampling_time(sampling_time)
, m_rngDist(0,1)
{
SC_HAS_PROCESS(Detector);
enable = sc_logic(0);
SC_THREAD(on_port_in_changed);
sensitive << p_in;
SC_THREAD(on_time_tick);
}
};
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