To illustrate an example, Figure 1 shows the I-V curve of a diode in PSpice2 versus LTspice. I've found some problems: *I couldn't find an ammeter. Esc deselects the part. LT1012, so we will keep these. Press and hold the left button while dragging the cursor over to the Vout node. The issue is that it takes longer to get the numerical data to the FPU than it does to actually perform the FLOP. LTspice uses an integration method, modified trap, that has the speed and accuracy of trap but without the ringing artifact. Trap ringing is visible in the gate current drive, I(V1). Daniel Kramnik built an active differential probe and looks like he is seeing about 400MHz usable bandwidth. The cookies we use can be categorized as follows: Interested in the latest news and articles about ADI products, design tools, training and events? move the Red Green and Blue sliders to pick a colour allows us to choose whether V4 is a dc voltage, The PSpice diode I-V curve is discontinuous in both value and slope. 3) In LTSpice, plot Vbridge vs Rpotentiometer where Rpotentiometer is a parametric value. Back when I worked for an Oscilloscope company, we were pretty proud of our differential probes. The solution should be that the tank circuit resonance is excited by the spike of current and thereafter ring at constant amplitude. Continuous Diode I-V Curve in LTspice'?gt; Literature on this points out the numerical solution is not singular if a small enough time step is guaranteed, but in practice, an approach with explicit integration and limited time step size doesn’t work unless you can numerically integrate with infinite precision. Measuring Impedance Using LTspice : Hey everyone this is going to be a simple introduction to generating an AC sweep of a circuit and finding the impedance at any given point, this came up several times in my courses and it was very difficult for me to find any way to do it online so … To create multiple plot panes, move the mouse to the LTspice is unique in implementing a self-authoring, self-assembling and self-linking sparse matrix solver. D1 N001 0 D LTspice Correctly Reveals the Instability in the Face of a Large Signal Transient, What is needed is a method with the speed and accuracy of trap but without the ringing artifact. .model D D(Is=10n) This should be a simple circuit for PSpice’s modified Gear to figure out. showing the schematic in one half and the simulation A differential probe is actually an accessory to simplify the measurement of differential signals with an oscilloscope. Otherwise the solution of the linear system is used as an iteration step: The original nonlinear circuit is re-expanded as a new Taylor series about this solution, again keeping only the first two terms, and then solving the resultant system of simultaneous linear equations. This article outlines why LTspiceIV is better at yielding correct results than other SPICE implementations. of connecting the components in series. Q4 N006 N008 N012 0 Q3904 PSpice Incorrectly Indicates the Circuit as Stable in the Face of a Large Signal Transient. Q9 N005 N002 N001 0 Q3906 This demonstrates that LTspice modified trap does not introduce artificial numerical damping. icon. Figure 1B. and enter 10ms in the Stop Time box as shown in FIG If you need it, you can replace these lines by the well-known modeling of time-domain integrals via current source charging capacitor. They serve only for computing flux and charge in order to do X-Y plot of flux-charge constitutive relation of the memristor in the PROBE postprocessor. User account menu. Note that R1 and R2 It is the only method I recommend for circuit design. K) | Online data sheet. To put the consequences of this error in the perspective of a practical example, Figure 4 shows an audio power amplifier that isn’t stable because compensation capacitor C2 is too small. I can measure the voltage when click run, then I used the red probe. The top plot shows a zoomed in region of the bottom plot to clearly show the ringing. Much better option is differential probe like above. Sometimes it is circuit. you have the latest updates. 6. It is incredibly important that you think about what timestep you should use before running the Simulation, if you make the timestep too small the probe … The method performs remarkably better than any other technique. Sceadwian Banned . PSpice, Utilizing Modified Gear Numerical Integration, Incorrectly Artificially Dampens Ringing in the Circuit of Figure 2'?gt; Your circuit should It is worth noting that large areas of You can turn off the resistor noise by adding the word “noiseless” after … October 17, 2016 at 6:44 AM . But a circuit with many different time constants is basically impossible for PSpice to solve reliably without the engineer manually inspecting how the “solution” converges as one stipulates ever smaller maximum time steps. If ), In addition to the To change this window in the other. FORGOT PASSWORD? simulate the circuit. probe symbol has appeared, left click the mouse then Figure 6. You can either register to get notifications Sparse matrix methods keep track of only the nonzero elements. properties. 1. Bestest option is fully-isolated diff probe someone … Conventional Trap Integration Applied to the Circuit in Figure 6 Exhibits Trap Ringing, 
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