103 lines
3.6 KiB
Plaintext
103 lines
3.6 KiB
Plaintext
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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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