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SPICE Macromodels
increasing power computer hardware simulation software widespread proliferation analog simulators. recognizes this, designed SPICE library containing models ALD's linear elements such operational amplifiers facilitate easier more accurate simulation customers. MACROMODEL DEFINITION computer simulation, there trade-off between accuracy convenience. transistor level SPICE operational amplifier model would require extremely long simulation times prone convergence problems. very simple model would simulate quickly, results would inaccurate. macromodel good compromise, suitable most engineering applications. macromodel uses transistors input stage ideal SPICE elements rest model. Ideal SPICE elements include voltage controlled voltage current sources, resistors capacitors. This combination reduces number active devices while providing reasonably accurate model. USING MACROMODELS macromodels were designed, written tested MicroSim's PSPICE, version 4.03. instructions that follow specifically PSPICE. Tailor your macromodel implementation your software package. macromodels used SPICE program that uses SPICE 2G.6 format. your syntax should happen different, should easy modify macromodels suit your system. Each different macromodels different amplifier. These macromodels should implemented your computer system different ways depending your level usage. only going model times, type directly into your circuit file. going more than times, want library system. this, type each operational amplifier macromodel will into single file with .lib extension. (e.g.ALD.lib) then, your circuit file, access macromodel need with subcircuit cell. example, file ALD.LIB, then your circuit file simulation ALD.Lib ALD1701(where 1701 model name subcircuit).
SPICE Macromodel
Advanced Linear Devices
This statement matches five nodes specify five operational amplifier inputs shown below: only other thing need statement telling SPICE where look library file. this, following statement your circuit file. .lib c:/path library (e.g. .lib PSPICE/ libraries/ ALD/ALD.lib) This method allows models subcircuits without having them every file. Finally, plan heavy macromodels, models available diskette part design kit.
1X105 10X10-6 15pF 5X10-6 148K VLIM 5X10-6 5X10-9 0.1V
0.1V
Vert
CURRENT LIMIT CKT.
SYSTEM VALD 1701 GATE PROTECTION hLim
Advanced Linear Devices
SPICE Macromodel
POTENTIAL PROBLEMS With computer models there difficulties encountered that would present actual physical device. These difficulties range from missing period circuit file limitations simulators ability adequately simulate complex systems. macromodels represent typical device behavior they model every parameter. Consequently care must taken during simulation. Most problems that occur placed under three categories. Hardware software problems related user's system Such problems would include improper SPICE configuration errors circuit file. Problems related simulation application These problems sometimes very complex. Such problems include: failure simulation converge, simulation does model certain parameter simulation behaves incorrectly. These problems involve simulator, model application model very interrelated way. Problems with model itself difficult distinguish these problems from type includes only model errors, slight model inaccuracy failure model model certain parameters.
Because business supplying integrated circuits, SPICE macromodels, only provide limited support models. Obviously cannot responsible case errors. Case errors( should exist) will addressed discretion. most difficult errors address those which come under case crucial that customers isolate source such errors before contacting ALD. Although company believes models will more than adequate almost simulation needs, they supplied basis guarantee models will model every possible operational amplifier behavior with accuracy. guarantee model have been thoroughly tested engineering staff have encountered errors. model your liking, easily modified user. course, simulation problems tricky elusive. However, recommends using simulator various system simulations guidelines engineering evaluation prior building breadboard where "true" system parametric performance verified. DETAILS MACROMODEL PSPICE contain program called Parts. Parts create macromodel given operational amplifier parameters. macromodels began with Parts model, were extensively modified provide more accurate model attributes each amp. example circuit macromodel shown previous page. following parameter modeled with ALD's macromodels: VOM+, VOM-, CMRR, IOSAT, slew rate, rise fall times, overshoot, output resistance, bandwidth, phase margin, common mode input voltage range, output voltage range, input diode clamping input capacitance. Some parameters modeled include: VOS, IOS, noise PSRR. CONCLUSION designer interested off-the -shelf parts, this provides powerful design simulation tool. those involved ASIC design with Function-Specific program these macromodels another level power, flexibility convenience.
SPICE Macromodel
Advanced Linear Devices
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