README and examples updated (trise, tfall, let, cdepth).
This commit is contained in:
Holger Vogt
parent
5c3ddfb8e4
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69cac5bcc6
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@ -1,121 +1,174 @@
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SEE (single event effects) generator
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NAME_TABLE:
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C_Function_Name: cm_seegen
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Spice_Model_Name: seegen
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Description: "single event effect generator"
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PORT_TABLE:
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Port_Name: ctrl out
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Description: "control input" "output"
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Direction: in out
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Default_Type: v i
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Allowed_Types: [v,vd,i,id] [i,id]
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Vector: no yes
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Vector_Bounds: - [1 -]
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Null_Allowed: yes no
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PARAMETER_TABLE:
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Parameter_Name: talpha tbeta
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Description: "alpha" "beta"
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Data_Type: real real
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Default_Value: 500e-12 20e-12
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: tdelay inull
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Description: "pulse delay" "max current"
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Data_Type: real real
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Default_Value: 0 200e-6
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: tperiod ctrlthres
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Description: "pulse repetition" "control voltage threshold"
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Data_Type: real real
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Default_Value: 0 0.5
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: perlim
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Description: "pulse repetition limited"
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Data_Type: boolean
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Default_Value: TRUE
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Limits: -
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Vector: no
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Vector_Bounds: -
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Null_Allowed: yes
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STATIC_VAR_TABLE:
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Static_Var_Name: last_t_value
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Data_Type: pointer
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Vector: no
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Description: "next pulse start time"
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STATIC_VAR_TABLE:
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Static_Var_Name: pulse_number
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Data_Type: pointer
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Vector: no
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Description: "number of pulse"
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STATIC_VAR_TABLE:
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Static_Var_Name: last_ctrl
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Data_Type: pointer
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Vector: no
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Description: "last control value"
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Description
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This code model generates "double exponentially" formed current pulses according to
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i(t) = inull * (exp(-(t-tdelay)/talpha) - (exp(-(t-tdelay)/tbeta) for t > tdelay
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i(t) = 0 for t < tdelay
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Minimum is one pulse output (a node pair, or a single node with the other grounded).
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Several output node pairs may be defined per code model instance. Parameter tperiod
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may then be used to create pulses in sequence. Per default only one sequence is running.
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Parameter perlim, set to FALSE, allows running and repeating the sequence until
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the end of the simulation. The first pulse is issued in the first
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node pair of the node list in the vector [], the second (after time tperiod has elapsed),
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is injected by the second node (pair) of the list and so on. When the sequence is repeated,
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again the output starts pulsing at port (node pair) number 1.
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The control input ctrl (voltage or current) may be used
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to start or repeat the whole sequence, depending on the circuit status. A rising voltage
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at ctrl, when crossing the threshold given by ctrlthres, will initiate the sequence (including
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tdelay and tperiod).
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This model will work in transient analysis. The time step TSEP should be chosen to be not
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larger than than tbeta.
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Example ngspice usage (with control)
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aseegen1 ctrl [%id(n1 m1) %id(n2 m2) %id(n1 m1) %id(n2 m2)] seemod1
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.model seemod1 seegen (tdelay = 8n tperiod=25n)
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Example ngspice usage (without control, parameters as offered by default)
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aseegen2 NULL [%id(n1 m1) %id(n5 n6) %id(n6 n7) %i(isingle) ] seemod2
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.model seemod2 seegen (tdelay = 0 tperiod=0 ctrlthres=0.5 inull=200u talpha=500p tbeta=20p perlim=FALSE)
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SEE (single event effects) generator
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The SEE generator generates current pulses, which resemble the
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charge generation and flow causes by a penetrating particle.
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How to use it:
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Select LET and charge collection depth cdepth, define them as parameters.
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Identify all nodes of a circuit netlist which are pn junctions,
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and thus are sensitive to pulses.
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Set up the SEEgenerator by adding for example
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* charge collection depth (in µm)
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.param d = 1
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* LET (linear energy transfer) in MeV*cm²/mg
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.param let = 12
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aseegen1 NULL [%id(xcell.n1 m1) %id(xcell.n2 m2) %id(xcell.n1 m1) %id(xcell.n2 m2)] seemod1
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.model seemod1 seegen (tdelay = 11n tperiod=25n let='let' cdepth='d')
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to the netlist.
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Each sensitive node from the (flattend) netlist may be added to assegen1, together with its
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reference node, for example GND for NMOS, nwell potential for PMOS. This procedure is
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currently to be done manually, an automated setup is in preparation.
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After a transient simulation, plotting the data output versus a non-radiated device
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may reveal the SEE influence.
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Several examples are gieven in ./src/axamples/xspice/see: inverters, SRAM cell, opamp,
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also as loop with varying LET to detect the threshold.
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As literature please see for example
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Ygor Quadros de Aguiar, Frédéric Wrobel. Jean-Luc Autran, Rubén García Alía
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Single-Event Effects, from Space to Accelerator Environments
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Springer 2025
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Detailed description (will be added to the manual):
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NAME_TABLE:
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C_Function_Name: cm_seegen
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Spice_Model_Name: seegen
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Description: "single event effect generator"
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PORT_TABLE:
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Port_Name: ctrl out
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Description: "control input" "output"
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Direction: in out
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Default_Type: v i
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Allowed_Types: [v,vd,i,id] [i,id]
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Vector: no yes
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Vector_Bounds: - [1 -]
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Null_Allowed: yes no
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PARAMETER_TABLE:
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Parameter_Name: tfall trise
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Description: "pulse fall time" "pulse rise time"
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Data_Type: real real
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Default_Value: 500e-12 20e-12
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: tdelay inull
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Description: "pulse delay" "max current"
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Data_Type: real real
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Default_Value: 0 0
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: tperiod ctrlthres
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Description: "pulse repetition" "control voltage threshold"
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Data_Type: real real
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Default_Value: 0 0.5
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: let cdepth
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Description: "lin energy transfer" "charge collection depth"
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Data_Type: real real
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Default_Value: 10 1
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: angle perlim
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Description: "particle angle" "pulse repetition"
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Data_Type: real boolean
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Default_Value: 0 TRUE
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Limits: [0 1.57079] -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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STATIC_VAR_TABLE:
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Static_Var_Name: last_t_value
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Data_Type: pointer
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Vector: no
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Description: "next pulse start time"
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STATIC_VAR_TABLE:
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Static_Var_Name: pulse_number
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Data_Type: pointer
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Vector: no
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Description: "number of pulse"
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STATIC_VAR_TABLE:
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Static_Var_Name: last_ctrl
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Data_Type: pointer
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Vector: no
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Description: "last control value"
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Description
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This code model generates "double exponentially" formed current pulses according to
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i(t) = inull * (exp(-(t-tdelay)/tfall) - (exp(-(t-tdelay)/trise) for t > tdelay
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i(t) = 0 for t < tdelay
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with inull given as parameter input or (if not given), calculated as
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inull = 1.035e-14 * let/cos(angle) * cdepth / (tfall - trise)
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with data for silicon, cdepth in µm, let in MeV*cm²/mg, angle in radians.
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Minimum is one pulse output (a node pair, or a single node with the other grounded).
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Several output node pairs may be defined per code model instance. Parameter tperiod
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may then be used to create pulses in sequence. Per default only one sequence is running,
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with one pulse for each node.
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Parameter perlim, set to FALSE, allows running and repeating the sequence until
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the end of the simulation. The first pulse is issued in the first
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node pair of the node list in the vector [], the second (after time tperiod has elapsed),
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is injected by the second node (pair) of the list and so on. When the sequence is repeated,
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again the output starts pulsing at port (node pair) number 1.
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The control input ctrl (voltage or current) may be used
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to start or repeat the whole sequence, depending on the circuit status. A rising voltage
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at ctrl, when crossing the threshold given by ctrlthres, will initiate the sequence (including
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tdelay and tperiod).
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This model will work in transient analysis. The time step TSTEP should be chosen to be not
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larger than than trise.
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Example ngspice usage (with control)
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aseegen1 ctrl [%id(n1 m1) %id(n2 m2) %id(n1 m1) %id(n2 m2)] seemod1
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.model seemod1 seegen (tdelay = 8n tperiod=25n)
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Example ngspice usage (without control, ctrl replaced by NULL, parameters as offered by default)
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aseegen2 NULL [%id(n1 m1) %id(n5 n6) %id(n6 n7) %i(isingle) ] seemod2
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.model seemod2 seegen (tdelay = 0 tperiod=0 ctrlthres=0.5 inull=0 tfall=500p trise=20p perlim=FALSE)
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@ -1,9 +1,10 @@
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* SEE generator model
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.subckt seegen4 n1 n2 n3 n4
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.param tochar = 1e-13
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.param talpha = 500p tbeta=20p
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.param Inull = 'tochar/(talpha-tbeta)'
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.param tochar = 2e-13
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.param tfall = 500p trise=50p
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.param Inull = 'tochar/(tfall-trise)'
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* Eponential current source without control input
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* only NMOS nodes with reference GND (substrate).
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aseegen1 NULL [%i(n1) %i(n2) %i(n3) %i(n4)] seemod1
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.model seemod1 seegen (tdelay = 0.62m tperiod=0.1m inull='Inull' perlim=FALSE)
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.ends
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@ -1,102 +0,0 @@
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SEE (single event effects) generator
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NAME_TABLE:
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C_Function_Name: cm_seegen
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Spice_Model_Name: seegen
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Description: "single event effect generator"
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PORT_TABLE:
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Port_Name: ctrl out
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Description: "control input" "output"
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Direction: in out
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Default_Type: v i
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Allowed_Types: [v,vd,i,id] [i,id]
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Vector: no yes
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Vector_Bounds: - [1 -]
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Null_Allowed: yes no
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PARAMETER_TABLE:
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Parameter_Name: talpha tbeta
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Description: "alpha" "beta"
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Data_Type: real real
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Default_Value: 500e-12 20e-12
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: tdelay inull
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Description: "pulse delay" "max current"
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Data_Type: real real
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Default_Value: 0 200e-6
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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PARAMETER_TABLE:
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Parameter_Name: tperiod ctrlthres
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Description: "pulse repetition" "control voltage threshold"
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Data_Type: real real
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Default_Value: 0 0.5
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Limits: - -
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Vector: no no
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Vector_Bounds: - -
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Null_Allowed: yes yes
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STATIC_VAR_TABLE:
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Static_Var_Name: last_t_value
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Data_Type: pointer
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Vector: no
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Description: "next pulse start time"
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STATIC_VAR_TABLE:
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Static_Var_Name: pulse_number
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Data_Type: pointer
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Vector: no
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Description: "number of pulse"
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STATIC_VAR_TABLE:
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Static_Var_Name: last_ctrl
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Data_Type: pointer
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Vector: no
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Description: "last control value"
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Description
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This code model generates "double exponentially" formed current pulses according to
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i(t) = inull * (exp(-(t-tdelay)/talpha) - (exp(-(t-tdelay)/tbeta) for t > tdelay
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i(t) = 0 for t < tdelay
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Minimum is one pulse output (a node pair, or a single node with the other grounded).
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Several output node pairs may be defined per code model instance. Parameter tperiod
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may then be used to create pulses in sequence. The first pulse is issued in the first
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node pair of the node list in the vector [], the second (after time tperiod has elapsed), is injected by the
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second node (pair) of the list and so on. The control input ctrl (voltage or current) may be used
|
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to start or repeat the whole sequence, depending on the circuit status. A rising voltage
|
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at ctrl, when crossing the threshold given by ctrlthres, will initiate the sequence (including
|
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tdelay and tperiod).
|
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This model will work in transient analysis.
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Example ngspice usage (with control)
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aseegen1 ctrl [%id(n1 m1) %id(n2 m2) %id(n1 m1) %id(n2 m2)] seemod1
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.model seemod1 seegen (tdelay = 8n tperiod=25n)
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Example ngspice usage (without control, parameters as offered by default)
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aseegen2 NULL [%id(n1 m1) %id(n5 n6) %id(n6 n7) %i(isingle) ] seemod2
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.model seemod2 seegen (tdelay = 0 tperiod=0 ctrlthres=0.5 inull=200u talpha=500p tbeta=20p)
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@ -117,8 +117,8 @@ GLOBAL VARIABLES
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NON-STANDARD FEATURES
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model source:
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Ygor Quadros de Aguiar, Frédéric Wrobel. Jean-Luc Autran, Rubén García Alía
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Single-Event Effects, from Space to Accelerator Environments
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Ygor Quadros de Aguiar, Frédéric Wrobel. Jean-Luc Autran, Rubén García Alía
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Single-Event Effects, from Space to Accelerator Environments
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Springer 2025
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||||
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==============================================================================*/
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