public override void step(Circuit sim) { if (voltageL == null) { sim.panic("Transmission line delay too large!", this); return; } sim.updateVoltageSource(lead_node[4], lead_node[0], voltSource1, -voltageR[ptr]); sim.updateVoltageSource(lead_node[5], lead_node[1], voltSource2, -voltageL[ptr]); if (Math.Abs(lead_volt[0]) > 1e-5 || Math.Abs(lead_volt[1]) > 1e-5) { sim.panic("Need to ground transmission line!", this); return; } }
public override void beginStep(Circuit sim) { // calculate voltages, currents sent over wire if (voltageL == null) { sim.panic("Transmission line delay too large!", this); return; } voltageL[ptr] = lead_volt[2] - lead_volt[0] + lead_volt[2] - lead_volt[4]; voltageR[ptr] = lead_volt[3] - lead_volt[1] + lead_volt[3] - lead_volt[5]; // System.out.println(volts[2] + " " + volts[0] + " " + // (volts[2]-volts[0]) + " " + (imped*current1) + " " + voltageL[ptr]); /* * System.out.println("sending fwd " + currentL[ptr] + " " + current1); * System.out.println("sending back " + currentR[ptr] + " " + current2); */ // System.out.println("sending back " + voltageR[ptr]); ptr = (ptr + 1) % lenSteps; }
public override void step(Circuit sim) { double[] vs = new double[3]; vs[0] = lead_volt[0]; vs[1] = lead_volt[1]; vs[2] = lead_volt[2]; if (vs[1] > lastv1 + .5) { vs[1] = lastv1 + .5; } if (vs[1] < lastv1 - .5) { vs[1] = lastv1 - .5; } if (vs[2] > lastv2 + .5) { vs[2] = lastv2 + .5; } if (vs[2] < lastv2 - .5) { vs[2] = lastv2 - .5; } int source = 1; int drain = 2; if ((pnp ? -1 : 1) * vs[1] > (pnp ? -1 : 1) * vs[2]) { source = 2; drain = 1; } int gate = 0; double vgs = vs[gate] - vs[source]; double vds = vs[drain] - vs[source]; if (Math.Abs(lastv1 - vs[1]) > .01 || Math.Abs(lastv2 - vs[2]) > .01) { sim.converged = false; } lastv1 = vs[1]; lastv2 = vs[2]; double realvgs = vgs; double realvds = vds; vgs *= (pnp ? -1 : 1); vds *= (pnp ? -1 : 1); ids = 0; gm = 0; double Gds = 0; double beta = getBeta(); if (vgs > .5 && this is JfetElm) { sim.panic("JFET is reverse biased!", this); return; } if (vgs < _threshold) { // should be all zero, but that causes a singular matrix, // so instead we treat it as a large resistor Gds = 1e-8; ids = vds * Gds; mode = 0; } else if (vds < vgs - _threshold) { // linear ids = beta * ((vgs - _threshold) * vds - vds * vds * .5); gm = beta * vds; Gds = beta * (vgs - vds - _threshold); mode = 1; } else { // saturation; Gds = 0 gm = beta * (vgs - _threshold); // use very small Gds to avoid nonconvergence Gds = 1e-8; ids = 0.5 * beta * (vgs - _threshold) * (vgs - _threshold) + (vds - (vgs - _threshold)) * Gds; mode = 2; } double rs = -(pnp ? -1 : 1) * ids + Gds * realvds + gm * realvgs; sim.stampMatrix(lead_node[drain], lead_node[drain], Gds); sim.stampMatrix(lead_node[drain], lead_node[source], -Gds - gm); sim.stampMatrix(lead_node[drain], lead_node[gate], gm); sim.stampMatrix(lead_node[source], lead_node[drain], -Gds); sim.stampMatrix(lead_node[source], lead_node[source], Gds + gm); sim.stampMatrix(lead_node[source], lead_node[gate], -gm); sim.stampRightSide(lead_node[drain], rs); sim.stampRightSide(lead_node[source], -rs); if (source == 2 && (pnp ? -1 : 1) == 1 || source == 1 && (pnp ? -1 : 1) == -1) { ids = -ids; } }