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ngspice/test_cases/node_collapsing/diode.c

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/*
* This file is part of the OSDI component of NGSPICE.
* Copyright© 2022 SemiMod GmbH.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*
* Author: Pascal Kuthe <pascal.kuthe@semimod.de>
*
* This is an exemplary implementation of the OSDI interface for the Verilog-A
* model specified in diode.va. In the future, the OpenVAF compiler shall
* generate an comparable object file. Primary purpose of this is example to
* have a concrete example for the OSDI interface, OpenVAF will generate a more
* optimized implementation.
*
*/
#include "osdi.h"
#include "string.h"
#include <math.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
// public interface
extern uint32_t OSDI_VERSION_MAJOR;
extern uint32_t OSDI_VERSION_MINOR;
extern uint32_t OSDI_NUM_DESCRIPTORS;
extern OsdiDescriptor OSDI_DESCRIPTORS[1];
// number of nodes and definitions of node ids for nicer syntax in this file
// note: order should be same as "nodes" list defined later
#define NUM_NODES 4
#define A 0
#define C 1
#define TNODE 2
#define CI 3
#define NUM_COLLAPSIBLE 2
// number of matrix entries and definitions for Jacobian entries for nicer
// syntax in this file
#define NUM_MATRIX 14
#define CI_CI 0
#define CI_C 1
#define C_CI 2
#define C_C 3
#define A_A 4
#define A_CI 5
#define CI_A 6
#define A_TNODE 7
#define C_TNODE 8
#define CI_TNODE 9
#define TNODE_TNODE 10
#define TNODE_A 11
#define TNODE_C 12
#define TNODE_CI 13
// The model structure for the diode
typedef struct DiodeModel
{
double Rs;
bool Rs_given;
double Is;
bool Is_given;
double zetars;
bool zetars_given;
double N;
bool N_given;
double Cj0;
bool Cj0_given;
double Vj;
bool Vj_given;
double M;
bool M_given;
double Rth;
bool Rth_given;
double zetarth;
bool zetarth_given;
double zetais;
bool zetais_given;
double Tnom;
bool Tnom_given;
double mfactor; // multiplication factor for parallel devices
bool mfactor_given;
// InitError errors[MAX_ERROR_NUM],
} DiodeModel;
// The instace structure for the diode
typedef struct DiodeInstace
{
double mfactor; // multiplication factor for parallel devices
bool mfactor_given;
double temperature;
double rhs_resist[NUM_NODES];
double rhs_react[NUM_NODES];
double jacobian_resist[NUM_MATRIX];
double jacobian_react[NUM_MATRIX];
bool is_collapsible[NUM_COLLAPSIBLE];
double *jacobian_ptr_resist[NUM_MATRIX];
double *jacobian_ptr_react[NUM_MATRIX];
uint32_t node_off[NUM_NODES];
} DiodeInstace;
#define EXP_LIM 80.0
double limexp(double x)
{
if (x < EXP_LIM)
{
return exp(x);
}
else
{
return exp(EXP_LIM) * (x + 1 - EXP_LIM);
}
}
double dlimexp(double x)
{
if (x < EXP_LIM)
{
return exp(x);
}
else
{
return exp(EXP_LIM);
}
}
// implementation of the access function as defined by the OSDI spec
void *osdi_access(void *inst_, void *model_, uint32_t id, uint32_t flags)
{
DiodeModel *model = (DiodeModel *)model_;
DiodeInstace *inst = (DiodeInstace *)inst_;
bool *given;
void *value;
switch (id) // id of params defined in param_opvar array
{
case 0:
if (flags & ACCESS_FLAG_INSTANCE)
{
value = (void *)&inst->mfactor;
given = &inst->mfactor_given;
}
else
{
value = (void *)&model->mfactor;
given = &model->mfactor_given;
}
break;
case 1:
value = (void *)&model->Rs;
given = &model->Rs_given;
break;
case 2:
value = (void *)&model->Is;
given = &model->Is_given;
break;
case 3:
value = (void *)&model->zetars;
given = &model->zetars_given;
break;
case 4:
value = (void *)&model->N;
given = &model->N_given;
break;
case 5:
value = (void *)&model->Cj0;
given = &model->Cj0_given;
break;
case 6:
value = (void *)&model->Vj;
given = &model->Vj_given;
break;
case 7:
value = (void *)&model->M;
given = &model->M_given;
break;
case 8:
value = &model->Rth;
given = &model->Rth_given;
break;
case 9:
value = (void *)&model->zetarth;
given = &model->zetarth_given;
break;
case 10:
value = (void *)&model->zetais;
given = &model->zetais_given;
break;
case 11:
value = (void *)&model->Tnom;
given = &model->Tnom_given;
break;
default:
return NULL;
}
if (flags & ACCESS_FLAG_SET)
{
*given = true;
}
return value;
}
// implementation of the setup_model function as defined in the OSDI spec
OsdiInitInfo setup_model(void *_handle, void *model_)
{
DiodeModel *model = (DiodeModel *)model_;
// set parameters and check bounds
if (!model->mfactor_given)
{
model->mfactor = 1.0;
}
if (!model->Rs_given)
{
model->Rs = 1e-9;
}
if (!model->Is_given)
{
model->Is = 1e-14;
}
if (!model->zetars_given)
{
model->zetars = 0;
}
if (!model->N_given)
{
model->N = 1;
}
if (!model->Cj0_given)
{
model->Cj0 = 0;
}
if (!model->Vj_given)
{
model->Vj = 1.0;
}
if (!model->M_given)
{
model->M = 0.5;
}
if (!model->Rth_given)
{
model->Rth = 0;
}
if (!model->zetarth_given)
{
model->zetarth = 0;
}
if (!model->zetais_given)
{
model->zetais = 0;
}
if (!model->Tnom_given)
{
model->Tnom = 300;
}
return (OsdiInitInfo){.flags = 0, .num_errors = 0, .errors = NULL};
}
// implementation of the setup_instace function as defined in the OSDI spec
OsdiInitInfo setup_instance(void *_handle, void *inst_, void *model_,
double temperature, uint32_t _num_terminals)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
DiodeModel *model = (DiodeModel *)model_;
// Here the logic for node collapsing ist implemented. The indices in this list must adhere to the "collapsible" List of node pairs.
if (model->Rs<1e-9){ // Rs between Ci C
inst->is_collapsible[0] = true;
}
if (model->Rth<1e-9){ // Rs between Ci C
inst->is_collapsible[1] = true;
}
if (!inst->mfactor_given)
{
if (model->mfactor_given)
{
inst->mfactor = model->mfactor;
}
else
{
inst->mfactor = 1;
}
}
inst->temperature = temperature;
return (OsdiInitInfo){.flags = 0, .num_errors = 0, .errors = NULL};
}
// implementation of the eval function as defined in the OSDI spec
uint32_t eval(void *handle, void *inst_, void *model_, uint32_t flags,
double *prev_solve, OsdiSimParas *sim_params)
{
DiodeModel *model = (DiodeModel *)model_;
DiodeInstace *inst = (DiodeInstace *)inst_;
// get voltages
double va = prev_solve[inst->node_off[A]];
double vc = prev_solve[inst->node_off[C]];
double vci = prev_solve[inst->node_off[CI]];
double vdtj = prev_solve[inst->node_off[TNODE]];
double vcic = vci - vc;
double vaci = va - vci;
double gmin = 1e-12;
for (int i = 0; sim_params->names[i] != NULL; i++)
{
if (strcmp(sim_params->names[i], "gmin") == 0)
{
gmin = sim_params->vals[i];
}
}
////////////////////////////////
// evaluate model equations
////////////////////////////////
// temperature update
double pk = 1.3806503e-23;
double pq = 1.602176462e-19;
double t_dev = inst->temperature + vdtj;
double tdev_tnom = t_dev / model->Tnom;
double rs_t = model->Rs * powf(tdev_tnom, model->zetars);
double rth_t = model->Rth * powf(tdev_tnom, model->zetarth);
double is_t = model->Is * powf(tdev_tnom, model->zetais);
double vt = t_dev * pk / pq;
// derivatives w.r.t. temperature
double rs_dt = model->zetars * model->Rs *
powf(tdev_tnom, model->zetars - 1.0) / model->Tnom;
double rth_dt = model->zetarth * model->Rth *
powf(tdev_tnom, model->zetarth - 1.0) / model->Tnom;
double is_dt = model->zetais * model->Is *
powf(tdev_tnom, model->zetais - 1.0) / model->Tnom;
double vt_tj = pk / pq;
// evaluate model equations and calculate all derivatives
// diode current
double id = is_t * (limexp(vaci / (model->N * vt)) - 1.0);
double gd = is_t / vt * dlimexp(vaci / (model->N * vt));
double gdt = -is_t * dlimexp(vaci / (model->N * vt)) * vaci / model->N / vt /
vt * vt_tj +
1.0 * exp((vaci / (model->N * vt)) - 1.0) * is_dt;
// resistor
double irs = 0;
double g = 0;
double grt = 0;
if (!inst->is_collapsible[0]) {
irs = vcic / rs_t;
g = 1.0 / rs_t;
grt = -irs / rs_t * rs_dt;
}
// thermal resistance
double irth = 0;
double gt = 0;
if (!inst->is_collapsible[1]) {
irth = vdtj / rth_t;
gt = 1.0 / rth_t - irth / rth_t * rth_dt;
}
// charge
double vf = model->Vj * (1.0 - powf(3.04, -1.0 / model->M));
double x = (vf - vaci) / vt;
double x_vt = -x / vt;
double x_dtj = x_vt * vt_tj;
double x_vaci = -1.0 / vt;
double y = sqrt(x * x + 1.92);
double y_x = 0.5 / y * 2.0 * x;
double y_vaci = y_x * x_vaci;
double y_dtj = y_x * x_dtj;
double vd = vf - vt * (x + y) / (2.0);
double vd_x = -vt / 2.0;
double vd_y = -vt / 2.0;
double vd_vt = -(x + y) / (2.0);
double vd_dtj = vd_x * x_dtj + vd_y * y_dtj + vd_vt * vt_tj;
double vd_vaci = vd_x * x_vaci + vd_y * y_vaci;
double qd = model->Cj0 * vaci * model->Vj *
(1.0 - powf(1.0 - vd / model->Vj, 1.0 - model->M)) /
(1.0 - model->M);
double qd_vd = model->Cj0 * model->Vj / (1.0 - model->M) * (1.0 - model->M) *
powf(1.0 - vd / model->Vj, 1.0 - model->M - 1.0) / model->Vj;
double qd_dtj = qd_vd * vd_dtj;
double qd_vaci = qd_vd * vd_vaci;
// thermal power source = current source
double ith = id * vaci ;
double ith_vtj = gdt * vaci ;
double ith_vcic = 0;
double ith_vaci = gd * vaci + id;
if (!inst->is_collapsible[0]) {
ith_vcic = 2.0 * vcic / rs_t;
ith += powf(vcic, 2.0) / rs_t;
ith_vtj -= - powf(vcic, 2.0) / rs_t / rs_t * rs_dt;
}
id += gmin * vaci;
gd += gmin;
double mfactor = inst->mfactor;
////////////////
// write rhs
////////////////
if (flags & CALC_RESIST_RESIDUAL)
{
// write resist rhs
inst->rhs_resist[A] = id * mfactor;
inst->rhs_resist[CI] = -id * mfactor + irs * mfactor;
inst->rhs_resist[C] = -irs * mfactor;
inst->rhs_resist[TNODE] = -ith * mfactor + irth * mfactor;
}
if (flags & CALC_REACT_RESIDUAL)
{
// write react rhs
inst->rhs_react[A] = qd * mfactor;
inst->rhs_react[CI] = -qd * mfactor;
}
//////////////////
// write Jacobian
//////////////////
if (flags & CALC_RESIST_JACOBIAN)
{
// stamp diode (current flowing from Ci into A)
inst->jacobian_resist[A_A] = gd * mfactor;
inst->jacobian_resist[A_CI] = -gd * mfactor;
inst->jacobian_resist[CI_A] = -gd * mfactor;
inst->jacobian_resist[CI_CI] = gd * mfactor;
// diode thermal
inst->jacobian_resist[A_TNODE] = gdt * mfactor;
inst->jacobian_resist[CI_TNODE] = -gdt * mfactor;
// stamp resistor (current flowing from C into CI)
inst->jacobian_resist[CI_CI] += g * mfactor;
inst->jacobian_resist[CI_C] = -g * mfactor;
inst->jacobian_resist[C_CI] = -g * mfactor;
inst->jacobian_resist[C_C] = g * mfactor;
// resistor thermal
inst->jacobian_resist[CI_TNODE] = grt * mfactor;
inst->jacobian_resist[C_TNODE] = -grt * mfactor;
// stamp rth flowing into node dTj
inst->jacobian_resist[TNODE_TNODE] = gt * mfactor;
// stamp ith flowing out of T node
inst->jacobian_resist[TNODE_TNODE] -= ith_vtj * mfactor;
inst->jacobian_resist[TNODE_CI] = (ith_vcic - ith_vaci) * mfactor;
inst->jacobian_resist[TNODE_C] = -ith_vcic * mfactor;
inst->jacobian_resist[TNODE_A] = ith_vaci * mfactor;
}
if (flags & CALC_REACT_JACOBIAN)
{
// write react matrix
// stamp Qd between nodes A and Ci depending also on dT
inst->jacobian_react[A_A] = qd_vaci * mfactor;
inst->jacobian_react[A_CI] = -qd_vaci * mfactor;
inst->jacobian_react[CI_A] = -qd_vaci * mfactor;
inst->jacobian_react[CI_CI] = qd_vaci * mfactor;
inst->jacobian_react[A_TNODE] = qd_dtj * mfactor;
inst->jacobian_react[CI_TNODE] = -qd_dtj * mfactor;
}
return 0;
}
// TODO implementation of the load_noise function as defined in the OSDI spec
void load_noise(void *inst, void *model, double freq, double *noise_dens,
double *ln_noise_dens)
{
// TODO add noise to example
}
#define LOAD_RHS_RESIST(name) \
dst[inst->node_off[name]] += inst->rhs_resist[name];
// implementation of the load_rhs_resist function as defined in the OSDI spec
void load_residual_resist(void *inst_, double *dst)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
LOAD_RHS_RESIST(A)
LOAD_RHS_RESIST(CI)
LOAD_RHS_RESIST(C)
LOAD_RHS_RESIST(TNODE)
}
#define LOAD_RHS_REACT(name) dst[inst->node_off[name]] += inst->rhs_react[name];
// implementation of the load_rhs_react function as defined in the OSDI spec
void load_residual_react(void *inst_, double *dst)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
LOAD_RHS_REACT(A)
LOAD_RHS_REACT(CI)
}
#define LOAD_MATRIX_RESIST(name) \
*inst->jacobian_ptr_resist[name] += inst->jacobian_resist[name];
// implementation of the load_matrix_resist function as defined in the OSDI spec
void load_jacobian_resist(void *inst_)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
LOAD_MATRIX_RESIST(A_A)
LOAD_MATRIX_RESIST(A_CI)
LOAD_MATRIX_RESIST(A_TNODE)
LOAD_MATRIX_RESIST(CI_A)
LOAD_MATRIX_RESIST(CI_CI)
LOAD_MATRIX_RESIST(CI_C)
LOAD_MATRIX_RESIST(CI_TNODE)
LOAD_MATRIX_RESIST(C_CI)
LOAD_MATRIX_RESIST(C_C)
LOAD_MATRIX_RESIST(C_TNODE)
LOAD_MATRIX_RESIST(TNODE_TNODE)
LOAD_MATRIX_RESIST(TNODE_A)
LOAD_MATRIX_RESIST(TNODE_C)
LOAD_MATRIX_RESIST(TNODE_CI)
}
#define LOAD_MATRIX_REACT(name) \
*inst->jacobian_ptr_react[name] += inst->jacobian_react[name] * alpha;
// implementation of the load_matrix_react function as defined in the OSDI spec
void load_jacobian_react(void *inst_, double alpha)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
LOAD_MATRIX_REACT(A_A)
LOAD_MATRIX_REACT(A_CI)
LOAD_MATRIX_REACT(CI_A)
LOAD_MATRIX_REACT(CI_CI)
LOAD_MATRIX_REACT(A_TNODE)
LOAD_MATRIX_REACT(CI_TNODE)
}
#define LOAD_MATRIX_TRAN(name) \
*inst->jacobian_ptr_resist[name] += inst->jacobian_react[name] * alpha;
// implementation of the load_matrix_tran function as defined in the OSDI spec
void load_jacobian_tran(void *inst_, double alpha)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
// set dc stamps
load_jacobian_resist(inst_);
// add reactive contributions
LOAD_MATRIX_TRAN(A_A)
LOAD_MATRIX_TRAN(A_CI)
LOAD_MATRIX_TRAN(CI_A)
LOAD_MATRIX_TRAN(CI_CI)
LOAD_MATRIX_TRAN(A_TNODE)
LOAD_MATRIX_TRAN(CI_TNODE)
}
// implementation of the load_spice_rhs_dc function as defined in the OSDI spec
void load_spice_rhs_dc(void *inst_, double *dst, double *prev_solve)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
double va = prev_solve[inst->node_off[A]];
double vci = prev_solve[inst->node_off[CI]];
double vc = prev_solve[inst->node_off[C]];
double vdtj = prev_solve[inst->node_off[TNODE]];
dst[inst->node_off[A]] += inst->jacobian_resist[A_A] * va +
inst->jacobian_resist[A_TNODE] * vdtj +
inst->jacobian_resist[A_CI] * vci -
inst->rhs_resist[A];
dst[inst->node_off[CI]] += inst->jacobian_resist[CI_A] * va +
inst->jacobian_resist[CI_TNODE] * vdtj +
inst->jacobian_resist[CI_CI] * vci -
inst->rhs_resist[CI];
dst[inst->node_off[C]] += inst->jacobian_resist[C_C] * vc +
inst->jacobian_resist[C_CI] * vci +
inst->jacobian_resist[C_TNODE] * vdtj -
inst->rhs_resist[C];
dst[inst->node_off[TNODE]] += inst->jacobian_resist[TNODE_A] * va +
inst->jacobian_resist[TNODE_C] * vc +
inst->jacobian_resist[TNODE_CI] * vci +
inst->jacobian_resist[TNODE_TNODE] * vdtj -
inst->rhs_resist[TNODE];
}
// implementation of the load_spice_rhs_tran function as defined in the OSDI
// spec
void load_spice_rhs_tran(void *inst_, double *dst, double *prev_solve,
double alpha)
{
DiodeInstace *inst = (DiodeInstace *)inst_;
double va = prev_solve[inst->node_off[A]];
double vci = prev_solve[inst->node_off[CI]];
double vdtj = prev_solve[inst->node_off[TNODE]];
// set DC rhs
load_spice_rhs_dc(inst_, dst, prev_solve);
// add contributions due to reactive elements
dst[inst->node_off[A]] +=
alpha * (inst->jacobian_react[A_A] * va +
inst->jacobian_react[A_CI] * vci +
inst->jacobian_react[A_TNODE] * vdtj);
dst[inst->node_off[CI]] += alpha * (inst->jacobian_react[CI_CI] * vci +
inst->jacobian_react[CI_A] * va +
inst->jacobian_react[CI_TNODE] * vdtj);
}
// structure that provides information of all nodes of the model
OsdiNode nodes[NUM_NODES] = {
{.name = "A", .units = "V", .is_reactive = true},
{.name = "C", .units = "V"},
{.name = "dT", .units = "K"},
{.name = "CI", .units = "V", .is_reactive = true},
};
// boolean array that tells which Jacobian entries are constant. Nothing is
// constant with selfheating, though.
bool const_jacobian_entries[NUM_MATRIX] = {};
// these node pairs specify which entries in the Jacobian must be accounted for
OsdiNodePair jacobian_entries[NUM_MATRIX] = {
{CI, CI},
{CI, C},
{C, CI},
{C, C},
{A, A},
{A, CI},
{CI, A},
{A, TNODE},
{C, TNODE},
{CI, TNODE},
{TNODE, TNODE},
{TNODE, A},
{TNODE, C},
{TNODE, CI},
};
OsdiNodePair collapsible[NUM_COLLAPSIBLE] = {
{CI, C},
{TNODE, NUM_NODES},
};
#define NUM_PARAMS 12
// the model parameters as defined in Verilog-A, bounds and default values are
// stored elsewhere as they may depend on model parameters etc.
OsdiParamOpvar params[NUM_PARAMS] = {
{
.name = (char *[]){"$mfactor"},
.num_alias = 0,
.description = "Verilog-A multiplication factor for parallel devices",
.units = "",
.flags = PARA_TY_REAL | PARA_KIND_INST,
.len = 0,
},
{
.name = (char *[]){"Rs"},
.num_alias = 0,
.description = "Ohmic res",
.units = "Ohm",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"Is"},
.num_alias = 0,
.description = "Saturation current",
.units = "A",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"zetars"},
.num_alias = 0,
.description = "Temperature coefficient of ohmic res",
.units = "",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"N"},
.num_alias = 0,
.description = "Emission coefficient",
.units = "",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"Cj0"},
.num_alias = 0,
.description = "Junction capacitance",
.units = "F",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"Vj"},
.num_alias = 0,
.description = "Junction potential",
.units = "V",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"M"},
.num_alias = 0,
.description = "Grading coefficient",
.units = "",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"Rth"},
.num_alias = 0,
.description = "Thermal resistance",
.units = "K/W",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"zetarth"},
.num_alias = 0,
.description = "Temperature coefficient of thermal res",
.units = "",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"zetais"},
.num_alias = 0,
.description = "Temperature coefficient of Is",
.units = "",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
{
.name = (char *[]){"Tnom"},
.num_alias = 0,
.description = "Reference temperature",
.units = "",
.flags = PARA_TY_REAL | PARA_KIND_MODEL,
.len = 0,
},
};
// fill exported data
uint32_t OSDI_VERSION_MAJOR = OSDI_VERSION_MAJOR_CURR;
uint32_t OSDI_VERSION_MINOR = OSDI_VERSION_MINOR_CURR;
uint32_t OSDI_NUM_DESCRIPTORS = 1;
// this is the main structure used by simulators, it gives access to all
// information in a model
OsdiDescriptor OSDI_DESCRIPTORS[1] = {{
// metadata
.name = "diode_va",
// nodes
.num_nodes = NUM_NODES,
.num_terminals = 3,
.nodes = (OsdiNode *)&nodes,
// matrix entries
.num_jacobian_entries = NUM_MATRIX,
.jacobian_entries = (OsdiNodePair *)&jacobian_entries,
.const_jacobian_entries = (bool *)&const_jacobian_entries,
// memory
.instance_size = sizeof(DiodeInstace),
.model_size = sizeof(DiodeModel),
.residual_resist_offset = offsetof(DiodeInstace, rhs_resist),
.residual_react_offset = offsetof(DiodeInstace, rhs_react),
.node_mapping_offset = offsetof(DiodeInstace, node_off),
.jacobian_resist_offset = offsetof(DiodeInstace, jacobian_resist),
.jacobian_react_offset = offsetof(DiodeInstace, jacobian_react),
.jacobian_ptr_resist_offset = offsetof(DiodeInstace, jacobian_ptr_resist),
.jacobian_ptr_react_offset = offsetof(DiodeInstace, jacobian_ptr_react),
// node collapsing
.num_collapsible = NUM_COLLAPSIBLE,
.collapsible = collapsible,
.is_collapsible_offset = offsetof(DiodeInstace, is_collapsible),
// noise
.noise_sources = NULL,
.num_noise_src = 0,
// parameters and op vars
.num_params = NUM_PARAMS,
.num_instance_params = 1,
.num_opvars = 0,
.param_opvar = (OsdiParamOpvar *)&params,
// setup
.access = &osdi_access,
.setup_model = &setup_model,
.setup_instance = &setup_instance,
.eval = &eval,
.load_noise = &load_noise,
.load_residual_resist = &load_residual_resist,
.load_residual_react = &load_residual_react,
.load_spice_rhs_dc = &load_spice_rhs_dc,
.load_spice_rhs_tran = &load_spice_rhs_tran,
.load_jacobian_resist = &load_jacobian_resist,
.load_jacobian_react = &load_jacobian_react,
.load_jacobian_tran = &load_jacobian_tran,
}};
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