Pulseshape from an APFEL ASIC preamplifier shaper. More...

#include <PndEmcAsicPulseshape.h>

Inheritance diagram for PndEmcAsicPulseshape:

Public Member Functions
	PndEmcAsicPulseshape ()

	PndEmcAsicPulseshape (double Tint, double Tsig)

virtual	~PndEmcAsicPulseshape ()

virtual double	operator() (const double t, const double amp, const double toffset) const

virtual double	value (const double t, const double amp, const double toffset) const

Private Member Functions
double	general_solution (const double t, const double amp, const double toffset) const

double	degenerate_solution (const double t, const double amp, const double toffset) const

Private Attributes
double	fTint

double	fTsig

Detailed Description

Pulseshape from an APFEL ASIC preamplifier shaper.

Circuit is described in EMC TDR and consists of charge-sensitive preamplifier, with the following pole-zero cancelation of its feedback ad 3rd order integrator. The pulseshape is determined by the integration time of single intagrator stage and scintillation time of the crystal, with exponential input convoluted with response of the circuit

Definition at line 31 of file PndEmcAsicPulseshape.h.

Constructor & Destructor Documentation

PndEmcAsicPulseshape::PndEmcAsicPulseshape ( )

Definition at line 24 of file PndEmcAsicPulseshape.cxx.

   : fTint(0), fTsig(0)    
 {
 }

PndEmcAsicPulseshape::PndEmcAsicPulseshape	(	double	Tint,
		double	Tsig
	)

Definition at line 29 of file PndEmcAsicPulseshape.cxx.

References fTint, and fTsig.

   : fTint(Tint), fTsig(Tsig)    
 {
   assert(fTint!=fTsig);
 }

virtual PndEmcAsicPulseshape::~PndEmcAsicPulseshape ( )

inlinevirtual

Definition at line 38 of file PndEmcAsicPulseshape.h.

38 {;}

Member Function Documentation

double PndEmcAsicPulseshape::degenerate_solution	(	const double	t,
		const double	amp,
		const double	toffset
	)		const

private

Definition at line 66 of file PndEmcAsicPulseshape.cxx.

References exp(), and fTint.

Referenced by operator()().

 {
         double dt=t-toffset;
         if(dt<0) return 0;                           // piecewise definition!
         
         double l_shaper=1.0/fTint;
    
         double term1 = exp(-l_shaper*dt)*pow(dt,3);
 
         return amp*term1;
 }

double PndEmcAsicPulseshape::general_solution	(	const double	t,
		const double	amp,
		const double	toffset
	)		const

private

Definition at line 45 of file PndEmcAsicPulseshape.cxx.

References exp(), fTint, and fTsig.

Referenced by operator()().

 {
         double dt=t-toffset;
         if(dt<0) return 0;                           // piecewise definition!
         
         double l_int=1.0/fTint;
         double l_sig=1.0/fTsig;
 
         double term1=exp(-dt*l_int)*dt*dt*dt/(6*(l_sig-l_int));
         double term2=exp(-dt*l_int)*dt*dt/(2*pow(l_sig-l_int,2));
         double term3=exp(-dt*l_int)*dt/(pow(l_sig-l_int,3));
         double term4=exp(-dt*l_int)/(pow(l_sig-l_int,4));
         double term5=exp(-dt*l_sig)/(pow(l_sig-l_int,4));
         
         return amp*(term1-term2+term3-term4+term5); 
 }

double PndEmcAsicPulseshape::operator()	(	const double	t,
		const double	amp,
		const double	toffset
	)		const

virtual

Implements PndEmcAbsPulseshape.

Definition at line 36 of file PndEmcAsicPulseshape.cxx.

References degenerate_solution(), fTsig, and general_solution().

                                                           {
   if(fTsig==0)return degenerate_solution(t,amp,toffset);
   
   return general_solution(t,amp,toffset);
 }