"The Signal" Topic List

Blogs listed below are grouped by a few general topics. Some may be listed in more than one category. Follow-ups are indented under the initial topic.

A sequential listing of the most recent blogs is here... The Signal

Op Amp Characteristics, Behaviors

Op Amp Voltage Ranges—input and output, clearing some confusion

Rail-to-Rail Inputs—what you should know!

Internal Input Bias Current Cancellation of bipolar (BJT) op amps

   Input Bias Current Cancelation Resistors—do you really need them?

Input Bias Current of CMOS and JFET Amplifiers

   Temperature Effects on Input Bias Current… plus a Random Quiz

Op Amp Noise—the non-inverting amplifier

   Op Amp Noise—but what about the feedback? noise contribution of feedback resistors

1/f Noise—the flickering candle

Chopper Op Amps—are they really noisy?

Input Capacitance—common-mode?...differential?… huh?

Matchy Matchy—how alike are dual op amps?

Swinging Close to Ground—single supply operation

Why Op Amps Oscillate—an intuitive look at two frequent causes

   Taming the Oscillating Op Amp

   Taming Oscillations—the capacitive load problem

Slew Rate—the op amp speed limit

Settling Time  a look at the character of the settling waveform

Bypass Capacitors… yes, but why?

Op Amps… G=1 stable & decompensated

The Inverting Attenuator, G = -0.1… is it unstable?

Protecting Inputs from Damage— EOS  protecting from input over-voltage

ESD… Zapp!  protecting circuits and systems from damage and functional failures

The Unused Op Amp—what to do?  how to connect unused op amps

“I Need High Input Impedance!”  input impedance vs. input bias current

“Typical”—what does it mean in a data sheet specification?

Differential Input Clamps-- can they affect your op amp circuits?

Offset Voltage and Open-Loop Gain—they’re cousins

Op Amps used as Comparators—is it okay?

Where are the Trim Pins?  some background on offset voltage trim pins

Instrumentation Amps and Difference Amps

Instrumentation Amplifiers—avoiding a common pitfall  providing a path for input bias current

Difference Amplifiers—the need for well-matched resistors

   Making Your Own Difference Amp—sometimes 1% resistors are good enough

SPICE and simulation issues

SPICE It Up! … but does Bob Pease say no?  is SPICE a crutch or a tool?

SPICEing Op Amp Stability  using SPICE to check stability of op amp circuits

SPICEing Offset Voltage  how to check the sensitivity of circuits to offset voltage

Simulating Gain-Bandwidth—the generic op amp model

Power Supply Bypassing—SPICE Simulations vs. Reality

Application Circuits and Issues

Grounding Principles... techniques for proper grounding and bypassing of amplifiers

Bypass Capacitors… yes, but why?  insight on the why of supply bypassing

Handy Gadgets and Resistor Divider Calculations, includes an Excel spreadsheet for offset voltage dividers

Put Gain Up Front—waxing philosophical

ESD… Zapp! protection of boards and systems from ESD

Resistor Noise—reviewing basics, plus a Fun Quiz

PCB Layout Tricks—striped capacitors and more

Protecting Inputs from Damage— EOS

Current Sources (and sinks)—understanding compliance range

TIA Input Z: Infinite… or Zero? What is it, really?  transimpedance amplifier input Z

Op Amps used as Comparators—is it okay?

Comparators—what’s all the chatter?

Paralleling Op Amps—is it possible?

Swinging Close to Ground—single supply operation

Other Components

Comparators—what’s all the chatter?

Thermocouples—stuff that every analog designer should know

Illuminating Photodiodes ;-)  the basics of photodiodes

When Potentiometers go to Pot  using pots in ratiometric mode

Controlling Volume—log pots  volume controls


Pop Quiz!   A 20-question quiz on previous blog topics. I dare you!

Brain Teaser... an infinite resistor network

  Brain Teaser —the solution

Resistor Puzzle—the sequel

  Resistor Puzzle Solution... and a rant on schematics

Breadboarding with Micro-Packages—Ouch!

Handy Gadgets and Resistor Divider Calculations  a cool Excel worksheet attached

PCB Layout Tricks—striped capacitors and more

Excel Cell formula for 1% resistors  bonus material at the end of this blog

Goop—a sticky topic  one of the most popular blogs

Honoring an Analog Giant  Bob Pease

Clairvoyant Troubleshooting

Interview Questions—memorable times on both sides

   Oh, That Interview Question— a reprise

“The Signal” travels to EDN

I Like Change… except when it happens! (changes to our blogs)

Knowing Where to Tap   A goodbye from Bruce and urging on knowledge-sharing and mentoring.