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Analog Circuit Simulation
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Short Description: Following Simulation, Breadboarding is Always Desirable and Necessary ..... " Analog Circuit Simulation," Chapter 13 of Amplifier Applications Guide, 1992, ...
Content Inside: MT-099 TUTORIAL
Analog Circuit Simulation
ANALOG CIRCUIT SIMULATION INTRODUCTION In recent years there has been much pressure placed on system designers to verify their designs with computer simulations before committing to actual printed circuit board layouts and hardware. Simulating complex digital designs is extremely beneficial, and very often, the prototype phase can be eliminated entirely. The same is not true for most analog circuits. While simulation can give a greater degree of confidence in the final design, completely bypassing the prototype phase in high-speed/high-performance analog or mixed-signal circuit designs can be very risky. For this reason, simulation should be accompanied with some amount of prototyping when dealing with analog circuits. Prototyping techniques are discussed in more detail in MT100. The most popular analog circuit simulation tool is SPICE (Simulation Program with Integrated Circuit Emphasis), which is available in multiple forms for various computer platforms (see References 1 and 2). However, to achieve meaningful simulation results, designers need accurate models of many system components. The most critical of these are realistic models for integrated circuits. The op amp is a fundamental building block in nearly all analog circuits, and in the early 1990's, Analog Devices developed an advanced op amp SPICE model, which is in fact still in use today (see References 3 and 4). Within this innovative open amplifier architecture, gain and phase response can be fully modeled, enabling designers to accurately predict ac, dc, and transient performance behavior. This modeling methodology has also been extended to include other devices such as in-amps, voltage references, and analog multipliers. The following discussion relates primarily to op amps and illustrates the fundamental principles
Understand Realistic Simulation Goals Evaluate Available Models Accordingly Know the Capabilities for Each Competing Op Amp Model Following Simulation, Breadboarding is Always Desirable and Necessary
Figure 1: Used Wisely, Simulation is a Powerful Design Tool Figure 1 lists some major SPICE simulation objectives. The popularity of SPICE simulation has led to many op amp macromodel releases, which (ideally) software-mimic amplifier electrical performance. With numerous models available, several confusions are possible. There may be uncertainty as to what is/isn't modeled, plus a basic question of model accuracy. All of these points are important, in order to place confidence in simulation results. So, verification of a model is important, checking it by comparison to the actual device performance conditions, before trusting it for serious designs.
Rev.0, 01/09, WK
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