Instead of modeling that, Linear has a native circuit element that does that, and its behavioral model simulates faster.Engelhardt says his approach to accelerating Spice evolved in an interesting fashion, and it required breaking some rules. Every time you use a lookup table, you have to fire those transistors in the RAM. Everybody needs to get rules into their layout tools to prevent mistakes like that from occurring.”A compendium of articles from legendary electronic design engineer Bob Pease, Volume 1To celebrate Bob’s memory, Electronic Design released two eBooks featuring collections of reader favorites. There needs to be some vetting of the actual layout so that bad things don’t happen,” Steffes says, noting an engineer who recently came to him.“‘Hey, I got this board and it looks like it’s okay, but I’m picking up these oscillations at gigahertz frequencies. He notes that the issue there is not the capability itself, but the speed of the execution, as that capability for MOSFET models was established as early as SPICE3.Rice shares Bob Pease’s opinion that one of the most important things that anybody who sets out to conduct simulation needs to understand is that there’s no substitute for understanding what one is doing, both at the circuit level and at the simulation level.“You need to understand the topology that you’re simulating. That makes it possible to solve the equations more rapidly.Sometimes, this comes down to a black-box approach. And since I have started using it, I have tried many different versions and deviations on the original SPICE program, but I have found I like LTSpice the best. But to solve the circuit matrix for a big IC, only a few parts out of a thousand are non-zero,” he says. “The theme of a lot of what we’ve been doing at Intersil is to guarantee no surprises from simulation to board.”Steffes also notes that many rail-to-rail low-power parts, especially chopper-stabilized amps, have a real load dependence in their open-loop characteristics. These articles are timeless and showcase why Bob Pease will always hold a revered place in the analog industry. “In the ’70s when you were writing a numerical solver, and you were being disciplined about it, you would always keep firmly in mind that the fastest way to complete something was to not compute it all but to put it in a lookup table,” he says, but that wasn’t for him.“That’s the worst thing you can do. The problem is that if your model incorporates a pure voltage output, you will never see it in stimulation,” he says. Especially since you can look online and usually find an m-file laying around that does what you want and reuse it without any changes.i prefer ALLspice….no, no…i vaguely remember using SPICE in college. That insight sent him to the literature about multi-threaded sparse-matrix solvers, which confirmed what he was finding out.“You can implement a multi-threaded solver that runs faster than a single-threaded solver if the matrix is exceedingly this sparse. OK, so I just tried it. I mean, they’ll clip if you try driving the input beyond the supplies in most models, but recovery from overdrive performance may not always be picked up,” he says.Despite every supplier’s best intentions, there are pitfalls. On the other hand, they can provide usable results more quickly, and they don’t allow users to make the kinds of mistakes that used to annoy Bob Pease Before there was spice, an engineer would draw a circuit, manually perform a nodal analysis using Kirchhoff’s current laws, write down the matrix of equations using Laplace transforms, solve the mesh, and extract the actual circuit behavior using reverse transforms. So you have to ping the transistors on the motherboard a few times to get the actual bit pattern that’s your double-position number. And, the programming language doesn’t know where X is stored. It’s now up to version IV.

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