Quick Start Guide

Here’s a source of circuits from today’s application notes, data sheets and textbooks. Use the collection anyway that works for you:

1. Download the SPICE file and off you go! Simulate, modify, expand it any way you like.
    
2. Read the brief tour of how it works with hands-on design and analysis. Like a buffet table - take as little or as much as you need.
    
3. Simulate your own circuits. Find a circuit similar to your interest. Then, modify it to fit your needs.

 

New to SPICE?

For an easy intro to circuit simulation, check out the RC Low-Pass Filter.

 

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SPICE TOPICS

A Brief History of SPICE

Why Simulate? 

Limitations of SPICE!

   Disclaimer

 

 

NEW DESIGN SERIES!

SOURCE MEASURE UNIT (SMU)

• How can forcing voltage or current test a variety of components?
• Understand device specs and tests better!

For tutorials and hands-on examples, check out the SMU Series

 

ERROR BUDGET ANALYSIS

• Will your circuit meet spec?
• How does each error source impact accuracy?
• Which parts require a higher precision?

For tutorials and examples, see the EBA Design Series

OP AMP APPLICATIONS

Function Generator - Part 1

Function Generator - Part 2

Programmable Gain Amplifier (PGA)

Op Amp Triangle Wave Generator

RC Low-Pass Filter with Op Amp Buffer (Single-Pole)

Sallen-Key Low-Pass Filter (Double-Pole)

Op Amp Comparator with Hysteresis

Op Amp PID Controller

Single-Supply AC Inverting Amplifier

H-Bridge Power Amp

Wien Bridge Oscillator

Current Source

Precision Half-Wave Rectifier

Op Amp Limiter

 

OP AMP BASICS

Inverting Amplifier

Non-Inverting Amplifier

Differential Amplifier

Voltage Follower

Integrator

Differentiator 

Summing Amplifier

I-to-V (Transimpedance) Amplifier

Basic Diode Limiter  New Topic!

Basic Op Amp SPICE Model

Quick Intro to the Basic Op Amp SPICE Model 

Input Offset Voltage

Input Bias Current

I-to-V Amp with Offset

 

SWITCH-MODE POWER SUPPLIES

SMPS Basics - The Buck Converter

SMPS Power Loss 

Buck Converter - Voltage Mode Control

Buck Converter - AC Model

Buck Converter - Compensation

SPICE Power Meter  

DAC Adjusts Supply Vout  New Topic!

 

GUITAR / MUSIC EFFECTS

Op Amp Distortion Box

Audio Tone Controls

Phase Shifter Series

All-Pass Filter using an Op Amp

JFET Variable Resistor and Attenuator

Guitar Effects - Phase Shifter

Graphic Equalizer Series

Part 1 Band Cut and Boost - Series LCR

Part 2 Cut / Boost - Single Pot

Part 3 Band Cut / Boost - Series LCR + Pot

Part 4 Simulated L and Graphic EQ

 

DESIGN TOPICS

Sampling Theory

Pulse Width Modulation

Component Tolerances - Part I 

Component Tolerances - Part II

Noise Analysis - Resistor Example 

Power Supply Bypassing 

Transmission Line Terminations

 

SENSORS INSTRUMENTATION

Sensor Bridge

Sensor Bridge with Current Bias

Instrumentation Amp (3 Op Amp)

NTC Thermistor Model

Linearized NTC Thermistor

Thermistor Preamp

Thermocouple Model

Thermocouple Preamp

 

FILTERS

Audio Tone Controls

Multiple Feedback Band-pass Filter

Simple RC Low-Pass Filter

RC Low-Pass Filter with Op Amp Buffer (Single-Pole)

Sallen-Key Low-Pass Filter (Double-Pole)

 

OP AMP MODELLING

Op Amp SPICE Models Overview

Quick Intro to Op Amp SPICE Models

Basic Op Amp Model

Intermediate (Boyle) Op Amp Model

 

Op Amp Builder - Generate Custom SPICE Netlists

Level1 - Gain, BW, Ro

Level2 - add Slew, V/I limit, 2nd/3rd poles

 

Advanced Functions

2nd Gain Stage  

Frequency Shaping Stages

Output Voltage Limiting

Output Current Limiting 

Supply Correction Current

Common-Mode Rejection 

Op Amp Input Voff and Ibias

Add 2nd and 3rd Poles - Improved Step Response

Alternative Methods

Slew Rate Using LIMIT 

Slew Rate Using TANH 

Output Voltage Limiter 

Output Current Limiter

 

JAVASCRIPT CALC

Circuit design collection - JavaScript/HTML

Op Amp Diff Amp - Find Signal and Common-Mode Gains.

Simple RC Filter Calculator.

R Divider Calculator.

Calc Op Amp Gain and Resistor Values.

Create a capacitor SPICE model.

Draw a rectangle on the canvas.

Draw a sine wave on the canvas.

Convert ratio, %, ppm, dB and bits to other units.

Op Amp Bandwidth versus Configuration.