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 NOTE  
If you're new to SPICE, the RC Low-Pass Filter is a great place to start.

 

DISCLAIMER

 

 

new EE Calculator Series!

Check out the growing collection of circuit design calculators using JavaScript / HTML

DMM Series!

Measure AC Volts using a classic circuit.

Extend the DMM's capability by measuring Capacitance

Measure Resistance using the Dual Slope INtegrator

Measure DC Current with this Network

Measure DC Volts with a Decade Divider

Inside the Dual-Slope Integrator

 

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

Integrator

Differentiator 

Summing Amplifier

Quick Intro to the Basic Op Amp SPICE Model 

Create Waveforms with the Summing Amplifier

I-to-V (Transimpedance) Amplifier

I-to-V Amp with Offset 

Basic Op Amp SPICE Model

Input Offset Voltage  

Input Offset Voltage Adjustment  

Input Bias Current

 

OP AMP ADVANCED

Op Amp Bandwidth

Max Slew Rate      

Open-Loop Gain Effect on DC Accuracy  

Gain Resistor Errors  

Feedback Analysis 

Driving a Capacitive Load

Op Amp Differentiator - Open Loop Analysis 

I-to-V Amp Stabilty

 

GENERAL CIRCUITS & MODELS

The 555 Timer 

Analog Behavioral Modeling

Basic Digital Gates  

DC Motor Model

Common Emitter Transistor Amplifier

Voltage Regulator w/ Series-Pass Transistor

Push-Pull Output Stage 

Transistor Differential Amplifier

Voltage-Controlled Resistor

Potentiometer Model

Capacitor Model 

The Miller Effect

 

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  

 

SWITCHED-CAPACITOR CIRCUITS

Switched-Capacitor Resistor  

Switched-Capacitor Integrator 

 

AUDIO AMPLIFIERS

Basic Audio Amplifier

Advanced Audio Amplifier

Diff Amp with Current Mirror 

Output Stage

The Miller Integrator 

Simplified Audio Amp Model

BJT Current Source  

Active Load in Gain Stage

 

EXCEL (VBA) TOPICS

VBA Basics

Resistor Divider

Sine Wave Generator

Triangle Wave Generator

Calculate Op_Amp_Gain_BW

ADC Function

Create Waveforms with the Fourier Series

 

Using the Circuit Collection

Here’s a growing 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 circuit notes for a brief tour of how it works along with some 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.

 

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

 

ADC INPUT DRIVERS

Single-Ended to Single-Ended

Differential to Single-Ended 

Single-Ended to Differential

Differential to Differential 

Fully Differential Amplifier 

 

CONTROL

Op Amp Control System -Part 1

Op Amp Control System -Part 2

Op Amp Control System - Lead  Compensation 

The PID Controller

Op Amp PID Controller  

DC Motor Model

 

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)

 

GUITAR / MUSIC EFFECTS

Op Amp Distortion Box

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

 

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

 

OP AMP MODELS

Op Amp Macro-Models

Basic Op Amp Model 

Intermediate Op Amp Model

     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 Response

     Easy to Use Functions 

Slew Rate Using LIMIT 

Slew Rate Using TANH 

Output Voltage Limiter 

Output Current Limiter

 

SPICE TOPICS

A Brief History of SPICE

Why Simulate? 

Limitations of SPICE!

 

THE SPICE ALGORITHM

Take a look inside the SPICE engine.   How it works...

Nodal Analysis 

Non-Linear DC Analysis

Transient Analysis  

Algorithm Overview 
 

 

 

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