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memristor code model in extradev
memristor code model in extradev
h_vogt
14 years ago
4 changed files with 272 additions and 0 deletions
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76examples/memristor/memristor_x.sp
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109src/xspice/icm/xtradev/memristor/cfunc.mod
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86src/xspice/icm/xtradev/memristor/ifspec.ifs
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1src/xspice/icm/xtradev/modpath.lst
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Memristor with threshold as XSPICE code model |
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* Y. V. Pershin, M. Di Ventra: "SPICE model of memristive devices with threshold", |
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* arXiv:1204.2600v1 [physics.comp-ph] 12 Apr 2012, |
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* http://arxiv.org/pdf/1204.2600.pdf |
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* XSPICE code model, parameter selection and plotting by |
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* Holger Vogt 2012 |
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.param stime=10n |
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.param vmax = 3 |
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* send parameters to the .control section |
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.csparam stime={stime} |
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.csparam vmax={vmax} |
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*Xmem 1 0 memristor |
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* triangular sweep (you have to adapt the parameters to 'alter' command in the .control section) |
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*V1 1 0 DC 0 PWL(0 0 '0.25*stime' 'vmax' '0.5*stime' 0 '0.75*stime' '-vmax' 'stime' 0) |
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* sinusoidal sweep |
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V1 0 1 DC 0 sin(0 'vmax' '1/stime') |
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* memristor model with limits and threshold |
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* "artificial" parameters alpha, beta, and vt. beta and vt adapted to basic programming frequency |
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* just to obtain nice results! |
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* You have to care for the physics and set real values! |
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amen 1 2 memr |
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.model memr memristor (rmin=1k rmax=10k rinit=7k alpha=0 beta='20e3/stime' vt=1.6) |
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vgnd 2 0 dc 0 |
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* This is the original subcircuit model |
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.subckt memristor plus minus PARAMS: Ron=1K Roff=10K Rinit=7.0K alpha=0 beta=20e3/stime Vt=1.6 |
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Bx 0 x I='((f1(V(plus)-V(minus))> 0) && (V(x) < Roff)) ? {f1(V(plus)-V(minus))}: ((((f1(V(plus)-V(minus)) < 0) && (V(x)>Ron)) ? {f1(V(plus)-V(minus))}: 0)) ' |
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Vx x x1 dc 0 |
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Cx x1 0 1 IC={Rinit} |
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Rmem plus minus r={V(x)} |
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.func f1(y)={beta*y+0.5*(alpha-beta)*(abs(y+Vt)-abs(y-Vt))} |
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.ends |
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* transient simulation same programming voltage but rising frequencies |
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.control |
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*** first simulation *** |
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* approx. 100 simulation points |
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let deltime = stime/100 |
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tran $&deltime $&stime uic |
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* plot i(v1) vs v(1) |
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*** you may just stop here *** |
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* raise the frequency |
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let newfreq = 1.1/stime |
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let newstime = stime/1.1 |
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let deltime = newstime/100 |
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alter @V1[sin] [ 0 $&vmax $&newfreq ] |
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tran $&deltime $&newstime uic |
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* raise the frequency even more |
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let newfreq = 1.4/stime |
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let newstime = stime/1.4 |
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let deltime = newstime/100 |
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alter @V1[sin] [ 0 $&vmax $&newfreq ] |
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tran $&deltime $&newstime uic |
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* the resistor currents |
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plot tran1.alli tran2.alli alli title 'Memristor with threshold: currents' |
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* calculate resistance (avoid dividing by zero) |
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let res = v(1)/(I(v1) + 1e-16) |
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let res1 = tran1.v(1)/(tran1.I(v1) + 1e-16) |
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let res2 = tran2.v(1)/(tran2.I(v1) + 1e-16) |
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* resistance versus time plot |
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settype impedance res res1 res2 |
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plot res vs time res1 vs tran1.time res2 vs tran2.time title 'Memristor with threshold: resistance' |
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* resistance versus voltage (change occurs only above threshold!) |
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plot res vs v(1) res1 vs tran1.v(1) res2 vs tran2.v(1) title 'Memristor with threshold: resistance' |
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* current through resistor for all plots versus voltage |
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plot i(v1) vs v(1) tran1.i(v1) vs tran1.v(1) tran2.i(v1) vs tran2.v(1) title 'Memristor with threshold: external current loops' |
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.endc |
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.end |
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/* =========================================================================== |
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FILE cfunc.mod |
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MEMBER OF process XSPICE |
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Copyright 2012 |
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Holger Vogt |
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Mülheim, Germany |
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All Rights Reserved |
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AUTHORS |
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6/08/2012 Holger Vogt |
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MODIFICATIONS |
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<date> <person name> <nature of modifications> |
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SUMMARY |
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This file contains the definition of a memristor code model |
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with threshold according to |
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Y. V. Pershin, M. Di Ventra: "SPICE model of memristive devices with threshold", |
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arXiv:1204.2600v1 [physics.comp-ph] 12 Apr 2012, |
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http://arxiv.org/pdf/1204.2600.pdf. |
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** Experimental, still to be tested in circuits !! ** |
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INTERFACES |
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cm_memristor() |
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REFERENCED FILES |
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None. |
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NON-STANDARD FEATURES |
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None. |
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=========================================================================== */ |
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/*=== INCLUDE FILES ====================*/ |
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#include <math.h> |
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#define RV 0 |
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/* model parameters */ |
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double alpha, beta, vt; |
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/* forward of window function */ |
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double f1(double y); |
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void cm_memristor (ARGS) |
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{ |
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// Complex_t ac_gain; |
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double partial; |
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double int_value; |
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double *rval; |
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double inpdiff; |
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/* get the parameters */ |
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alpha = PARAM(alpha); |
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beta = PARAM(beta); |
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vt = PARAM(vt); |
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/* Initialize/access instance specific storage for resistance value */ |
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if(INIT) { |
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cm_analog_alloc(RV, sizeof(double)); |
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rval = (double *) cm_analog_get_ptr(RV, 0); |
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*rval = PARAM(rinit); |
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} |
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else { |
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rval = (double *) cm_analog_get_ptr(RV, 0); |
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} |
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/* Compute the output */ |
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if(ANALYSIS == TRANSIENT) { |
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/* input the voltage across the terminals */ |
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inpdiff = f1(INPUT(memris)); |
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if ((inpdiff > 0) && (*rval < PARAM(rmax))) |
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int_value = inpdiff; |
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else if ((inpdiff < 0) && (*rval > PARAM(rmin))) |
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int_value = inpdiff; |
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else |
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int_value = 0.0; |
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/* integrate the new resistance */ |
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cm_analog_integrate(int_value, rval, &partial); |
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/* output the current */ |
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OUTPUT(memris) = INPUT(memris) / *rval; |
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PARTIAL(memris, memris) = partial; |
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} |
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/* no AC and DC modeling so far ! |
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else if(ANALYSIS == AC) { |
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ac_gain.real = *vc; |
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ac_gain.imag = 0.0; |
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AC_GAIN(memris, memris) = ac_gain; |
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} */ |
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} |
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/* the window function */ |
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double f1(double y) { |
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return (beta*y+0.5*(alpha-beta)*(fabs(y+vt)-fabs(y-vt))); |
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} |
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/* =========================================================================== |
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FILE ifspec.ifs |
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MEMBER OF process XSPICE |
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Copyright 2012 |
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Holger Vogt |
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Mülheim, Germany |
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All Rights Reserved |
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AUTHORS |
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06/08/2012 Holger Vogt |
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MODIFICATIONS |
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<date> <person name> <nature of modifications> |
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SUMMARY |
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This file contains the definition of a memristor code model |
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with threshold according to |
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Y. V. Pershin, M. Di Ventra: "SPICE model of memristive devices with threshold", |
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arXiv:1204.2600v1 [physics.comp-ph] 12 Apr 2012, |
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http://arxiv.org/pdf/1204.2600.pdf. |
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** Experimental, still to be tested in circuits !! ** |
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INTERFACES |
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None. |
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REFERENCED FILES |
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None. |
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NON-STANDARD FEATURES |
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None. |
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=========================================================================== */ |
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NAME_TABLE: |
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Spice_Model_Name: memristor |
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C_Function_Name: cm_memristor |
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Description: "Memristor interface" |
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PORT_TABLE: |
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Port_Name: memris |
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Description: "memristor terminals" |
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Direction: inout |
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Default_Type: gd |
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Allowed_Types: [gd] |
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Vector: no |
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Vector_Bounds: - |
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Null_Allowed: no |
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PARAMETER_TABLE: |
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Parameter_Name: rmin rmax rinit |
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Description: "minimum resistance" "maximum resistance" "initial resistance" |
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Data_Type: real real real |
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Default_Value: 10.0 10000.0 7000.0 |
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Limits: - - - |
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Vector: no no no |
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Vector_Bounds: - - - |
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Null_Allowed: no no no |
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PARAMETER_TABLE: |
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Parameter_Name: alpha beta vt |
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Description: "model parameter 1" "model parameter 2" "threshold" |
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Data_Type: real real real |
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Default_Value: 0.0 1.0 0.0 |
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Limits: - - - |
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Vector: no no no |
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Vector_Bounds: - - - |
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Null_Allowed: no no no |
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