optimize_bjt_switch.ngjs

#!/usr/bin/env ngspicejs
// Use 3.3V to switch 150R load using BJT, optimize values of R1,R2,R3 to have maximal on current and minimal off current
// linter: ngspicejs-lint
"use strict";

battery('U1', 1, 0, 9);
ammeter('A1', 1, 2);
resistor('RLOAD', 2, 5, 150);
var r1 = resistor('R1', 6, 7, '6k8');
var r2 = resistor('R2', 1, 7, '100k');
var r3 = resistor('R3', 7, 0, '100k');
square('U2', 6, 0).v(3.3).f(50);
npn('T1', 5, 7, 0, 'BC547');

var t = tran().run().chart('V(6)');
var ion = t.value_at('I(A1)', '5m');
var ioff = t.value_at('I(A1)', '15m');
echo('ion', ion.toEng(), 'ioff', ioff.toEng());

var csv = [['R1','R2','R3','Ion','Ioff']], score, best = 0;
series_e3(100, '10M').forEach((a) => {
    series_e3(1000, '10M').forEach((b) => {
        series_e3(1000, '10M').forEach((c) => {
            r1.r(a);
            r2.r(b);
            r3.r(c);
            t = tran().run();
            ion = t.value_at('I(A1)', '5m');
            ioff = t.value_at('I(A1)', '15m');
            score = 0.9 * ion + 0.001 / ioff;
            if (ion < 0.030) {
                score = 0;
            }
            if (score > best) {
                echo('r1', a, 'r2', b, 'r3', c, 'ion', ion.toEng(), 'ioff', ioff.toEng(), 'score', score);
                best = score;
            }
            csv.push([a, b, c, ion, ioff, score]);
        });
    });
});
//file_write_csv('1.csv', csv);
echo('DONE');