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Rarely Asked Questions -- Strange but true stories from the call logs of Analog Devices.

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Issue 99:

Issue 98:

Common Sense for Current Sensing

Choosing a Precision Op Amp? Trust Goldilocks

Going Full Tilt

Who killed that component?

Who ate my dBs?

Citius, Altius, Fortius

Kalman or FIR Filter for My IMU?

When Second Sources Aren't

O CMRR, CMRR! Wherefore Art Thou CMRR?

Missing Half the Signal

Unused Pins

The Truth About Voltage Feedback Resistors

Unfiltered Analog

Voltage References Can Bite You, Too

The Ingenious Gentleman and the Mysterious Paddle

Mystery Spur Explained: Don't Blame the DDC!

Murphy Rules!

Muntzing can save cost, components, and even your sanity

Isn’t that gain specification a bit lopsided?

Choosing References

Don’t Get Caught Speeding

Exposed Paddles and Downbonds Improve Performance and Reduce Pin Count

Choosing Analog ICs

I Grew Up in the 80s and Survived!

ADCs for High Dynamic Range – Successive-Approximation or Sigma-Delta?

LEDs are Photodiodes Too

The Diamond Plot

Overranged Converter Recovers Quickly

Discretion is the better part…

Looking for Trouble in All the Wrong Places

Programmable ADC Input Range Provides System Benefits

Defying Scrooge

Bits Per Second Make My Head Hertz

RAQs: 100 Issues and Counting

Overrange Flag Indicates Data Validity

Design Tools and Support Communities Make Analog Fun, not Fearful

Issue 97:

EngineerZone Makes Getting Answers a Breeze

Issue 96:

Soft Clipping vs. Hard Clipping

Issue 95:

Do-it-Yourself ASICs

Issue 94:

Crystal Radio Sets and Op Amps - Both Can Detect RF Signals

Issue 93:

Input Magic - Differential Signals Allow Input Swing to Exceed Supply Voltage

Issue 92:

Multipliers and Modulators

Issue 91:

Noise Gain vs. Signal Gain - What's the difference between noise gain and signal gain?

Issue 90:

Resolution vs. ENOB - Still Hazy After All These Years

Issue 89:

Electronic is Fun - Is Analog Electronics Fun?

Issue 88:

The Decline of Rounding—or How Significant is Significance?

Issue 87:

Apples and Oranges—Correlating Specifications Requires Common Test Conditions

Issue 86:

Current Transformers—and Vacuum Cleaners

Issue 85:

Great Expectations Come From Basic Understandings

Issue 84:

Driving Miss ADC

Issue 83:

Dual Op Amps and Double Agents: They may not always appear to be who they say they are...

Issue 82:

Transformers: They're Not All Boat Anchors

Issue 81:

Switching Bits

Issue 80:

The Electromotive Force and Op Amps

Issue 79:

Nobody is Perfect - Not Even an Engineer!

Issue 78:

Considerations on High-Speed Converter PCB Design, Part 4: Plane Coupling

Issue 77:

Beware of big claims and large numbers...they don't always add up.

Issue 76:

In and Out - or - Why Have a Capacitor?

Issue 75:

Crosstalkin' Converters

Issue 74:

Rotary Potentiometers: There Must Be a Better Option

Issue 73:

The Benefits of Ancient Logic

Issue 72:

Balancing Phase in High-Speed Converters

Issue 71:

Looking for savings in all the wrong places

Issue 70:

Do Something with that Unused Pin!

Issue 69:

Considerations on High-Speed Converter PCB Design, Part 3: The E-Pad Low Down

Issue 68:

A Foolish Question about Op Amps and Capacitors

Issue 67:

Measuring the DC Parameters of Op Amps

Issue 66:

Considerations on High-Speed Converter PCB Design, Part 2: Using Power and Ground Planes to Your Advantage.

Issue 65:

Op Amp Dedicated Feedback Pin Helps Achieve New Levels of Performance; or This feedback pin is dedicated to all those op amps out there tonight!

Issue 64:

Oversampling and Undersampling

Issue 63:

Considerations on High-Speed Converter PCB Design, Part 1: Power and Ground Planes.

Issue 62:

Is amplifier headroom cramping your style?

Issue 61:

Make Do!

Issue 60:

Watch for Those Multiple Clocking Edges!

Issue 59:

Is Your Amplifier Disabled, or is it Merely Sleeping?

Issue 58:

How to Avoid Burning Cakes

Issue 57:

Keeping Your A/D Converter Clocks Jitter Free

Issue 56:

Amplifier, attenuator or both?

Issue 55:

Taming A/D Converter Power Supplies

Issue 54:

Don't be Mean - be Root Mean Square!

Issue 53:

VFB or CFB that is the question!

Issue 52:

Bring on the Converter Noise! - Part 2

Issue 51:

Bring on the Converter Noise! - Part 1

Issue 50:

What's the big deal about ABSOLUTE MAXIMUM RATINGS?

Issue 49:

What's the (Converter) Frequency Kenneth?

Issue 48:

Some Chips Have Moving Parts!

Issue 47:

Which carries more weight, a datasheet or SPICE macromodel?

Issue 46:

What shall we do with an unused op-amp?

Issue 45:

Glass Diodes May See the Light – and Hum

Issue 44:

Keeping Common Modes Common

Issue 43:

Impedance Measuring Chip Offers Little Resistance to Applications

Issue 42:

Are Your Filters Filtering?

Issue 41:

What's in Your Toolbox?

Issue 40:

How Big Is It?

Issue 39:

Off-amps, what the heck are off-amps? Op amps with no power applied, of course.

Issue 38:

Single Supply Amplifiers – They Sound Simple ... are they?

Issue 37:

Lock Down That Noise - Don't Let It Escape

Issue 36:

The Difference Between Different Differential Amplifiers

Issue 35:

Stress Is Bad For You – and For Analog ICs

Issue 34:

A Capaciticectomy? Sounds Awfully Painful!

Issue 33:

Hysteresis Blocks Magic

Issue 32:

Political Correctness and Datasheets

Issue 31:

Too Hot or Too Cold May Be Just Right

Issue 30:

CAPACITIVE SENSORS: Rugged Enough for the Real World?

Issue 29:

Half Full or Half Empty? Thoughts on Capacity.

Issue 28:

What's Your Amplifier's Febricity Due to Electricity?

Issue 27:

Resistors (and old ladies) have hidden depths

Issue 26:

Op-Amp Noise can be Deafening Too

Issue 25:

Resistor Noise can be Deafening, and Hard to Reduce

Issue 24:

Are leaky amps sinking your design?

Issue 23:

Should you butcher your circuit or your test gear? Capable engineers should be prepared to question, and modify, anything, not just their own designs.

Issue 22:

Things (animals and ADCs) are not always what they seem

Issue 21:

Breadboarding With Surface Mount ICs Too small, or not too small? That is the question...

Issue 20:

Igor, pass me some supply sequencers!

Issue 19:

Observing Maximum Ratings or How to Avoid Forecasts of Doom

Issue 18:

Just How Accurate was William Tell, Anyway?

Issue 17:

More Chips are Better than One (or the Benefits of Belgian Food)

Issue 16:

Replacing Optocouplers with Digital Isolators (or How a Midnight Ride Could Have Been Avoided)

Issue 15:

The Long Term Stability of Precision Analog ICs, or How to Age Gracefully and Avoid Sudden Death

Issue 14:

Resourcefulness, or Why Good Engineers (and Good Cooks) Use the Best Available Components.

Issue 13:

It May be Greek to You, but Sigma Delta Converters are Not Really Hard to Understand

Issue 12:

How Not to Design Active Filters (or Not Only Sharks Distract Divers)

Issue 11:

Comparators & Op Amps – May They Never Meet (or Good Advice from Mr. Punch)

Issue 10:

Digital Processing Does Not Always Rule (or What Makes an Analog Engineer Laugh?)

Issue 9:

Grounding Converters (or Philosophy to the Rescue!)

Issue 8:

Happy Groundhog Day!

Issue 7:

It's Easy to Drive An EE to Drink – but What Drives One to Poetry?

Issue 6:

Tick-Tock, Tick-Tock

Issue 5:

Check the Bias Current (or How to Ensure that a Blessing is Heard)

Issue 4:

Caveat Emptor

Issue 3:

Isolating the Key Detail (or Lunching With a Mermaid and Pickled Herring)

Issue 2:

Slow "Starting" ADCs (or the Beneficial Effects of Spirits in Diagnosing Converter Problems)

Issue 1:

Radio Frequency Interference (or How to Get a Free Lunch at a Very Good Restaurant)

Copyright 1995- Analog Devices, Inc. All rights reserved.