Analog

Steve Taranovich
Editor
Latest design tips and clever circuit architectures that analog design engineers must have to keep up with fast-paced developments in the analog world of interface, timing, and RF advancements. Industry innovations and processes that enhance analog performance are some of the many topics to be explored in great technical depth as they happen.

Improper power sequencing in op amps: Analyzing the risks

In systems with multiple supply voltages, operational amplifier power supplies must be established simultaneously with, or before, any input signals are applied. If this doesn’t happen, overvoltage and latch-up conditions can occur. Read More...

Moving to improve automotive safety with MEMS scanning mirror technology

During the MEMS & Sensors Executive Congress, Jari Honkanen from MicroVision showed off amazing MEMS moving mirror technology. Read More...

Cycles per second: A historical perspective

Heinrich Hertz proved the existence of electromagnetic waves, for which we associate his name with cycles-per-second. Read More...

Use plastic optical fiber for isolation

Consumer audio components create low-cost HV isolation, and a reliable, secure physical connection. Read More...

Understanding and designing differential filters for communications systems

Understand how to transfer a single-ended filter design to a differential filter design, and optimize your PCB design. Read More...

The cross sectional area of wire

Expressing the cross sectional area of wire with pi can get numerically awkward, so here's another way. Read More...

LED lamp cycles on and off, why?

When an LED flood lamp started cycling, I suspected temperature. Now, how can we find what's the root cause? Read More...

Enhancing audio system designs with digital signal processing

You don't have to be an audio DSP/embedded software geek to effectively design audio systems with microphones to enhance the system performance. Read More...

Mission to Pluto: An interview with New Horizons' “MOM”

I had a recent interview with Alice Bowman, NASA’s New Horizons Mission Operations Manager, and posed what I thought might be some interesting questions for our EDN audience regarding the New Horizons spacecraft. Read More...

What I learned about LTE-M at the MEMS & Sensors Executive Congress 2016

MEMS & Sensors Executive Congress keynote speaker Cameron Coursey, from AT&T, presented "The Future of Sensors and MEMS in the Internet of Things." Read More...

Isolated LVDS buffers for high-speed, high-voltage isolation

Isolation is a means of preventing DC and unwanted AC between two parts of a system, while still allowing a signal and power transfer between those two parts. Read More...

Getting rid of stray rectification

A measurement instrument that was under development was experiencing problems of radiated EMI susceptibility. Read More...

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AM detector more sensitive than simple diode

A traditional diode RF detector has its limitations. This DI describes a simple way to overcome them. Read More...

RC oscillator generates linear triangle wave

This DI describes a novel way to generate a triangle wave. Read More...

Iterated-map circuit creates chaos

The chaotic circuit in this Design Idea can generate random numbers, demonstrate chaotic behaviour, and impress friends and colleagues. Read More...

Line receiver provides self test

Use a quad differential comparator to provide adequate self-test for systems using line receivers for differential input signals. Read More...

LTC Design Note: Accurate, fast settling analog voltages from PWM signals

A unique IC mitigates the disadvantages of PWM DACs. Read More...

LTC Design Note: Precision op-amp enables fast multiplexing at low power

A multiplexed DAQ design presents some subtle challenges, and parts selection plays a crucial role. Read More...

LTC Design Note: Robust high voltage Over-the-Top op-amps maintain high input impedance with inputs driven apart or when powered down

Learn how the innards of an “over-the-top” op-amp work (where inputs can be higher than V+), as well as related design considerations. Read More...

A faster PWM-based DAC

PWM DACs are cheap, cheerful, and slow. But this Design Idea describes a way to speed them up. Read More...

Reduce relay coil current with a reset controller IC

A new twist on reducing power when driving relays and solenoids. Read More...

Control accurate incremental voltage steps with a rotary encoder

This handy little DI circuit affords precise voltage-step control and makes a good pot replacement in many cases. Read More...

Precision programmable current source uses two ICs

Here are some programmable current source Design Ideas which make good use of precision on-chip component matching. Read More...

Programmable-gain amp achieves high gains

Roll your own PGA to get the exact high gains you need. Read More...

Modded charge pump extracts power from digital signal

At first glance, these charge pumps & voltage multiplier/inverters look conventional, but they have a trick up their sleeves. Read More...

Software PLL syncs to line using moving-average filter

A software PLL with a jitter attenuator lends itself to AC-line filtering and many other applications. Read More...

Fast, low-noise JFET amp is stable over temperature

This Design Idea combines the strong points of JFETs and CFAs to make a high-impedance amplifier that’s fast, stable over temperature, and quiet. Read More...

Single-MOSFET circuits gate & modulate

The humble discrete MOSFET shows its versatility in this Design Idea. Read More...

Read multiple switches using ADC

How the author learned to interface 8 switches using zero GPIOs. Read More...

Gain-selectable IC yields voltage-to-current converter

A voltage-to-current converter Design Idea with no discrete components and excellent specs. Read More...

LTC Design Note: Driver for 14-bit, 4.5 MSPS ADC operates over a wide gain range

Assure optimum performance by matching up ADC and input driver. Read More...

Simulate digital filters with PSpice

PSpice isn’t just for analog! This Design Idea shows it can handle digital filter simulation too. Read More...

Instrumentation amp makes an accurate transimpedance amp too

The interesting topology in this Design Idea turns a monolithic in-amp into a good transimpedance amp for photodiode or similar applications. Read More...

Schmitt trigger adapts its own thresholds

If you need to condition a widely-varying signal, a simple Schmitt won’t work, but this DI will. Read More...

Voltage indicator transitions between colours

Using a two-colour LED, this Design Idea indicates power-on and voltage level. Read More...

Linear ramp generator uses one op-amp

Get integrator-like ramps that know when to stop. Read More...

Circuit lets AGC amp hold its gain

AGC amps respond to signal level. This Design Idea allows gain to be held despite a changing level. Read More...

Three-op-amp state-variable filter perfects the notch

There are many variants of the state-variable filter, but this one might just have the best notch output(s). Read More...

Schmitt trigger uses two transistors

Here’s a DI circuit that displays Schmitt-trigger action and can work at high current or voltage. Read More...

Monitor 15 contacts with one PIC input

Take advantage of a microcontroller’s feature set to simplify switch & contact interface. Read More...

Gated oscillator holds last level

Unlike a typical gated oscillator, this one holds its current output level when turned off. Read More...

Optocoupler speed-up also reduces power consumption

Optocouplers tend to be sluggish, unless you have this circuit up your sleeve. Read More...

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Isolated transceiver offers robust isolation

With 6500 VRMS reinforced isolation, Linear Technology’s LTM2885 RS-485 transceiver guards against large ground-to-ground differentials. Read More...

SPI isolators assist data converters

Intended for use with Linear Technology’s SAR ADCs and DACs, the LTM2893 and LTM2895 isolators support SPI clock speeds of up to 100 MHz. Read More...

Analog comparators cut current consumption

STMicroelectronics upgraded its TSX series of 16-V CMOS dual and quad comparators to achieve lower current consumption of 5 µA/comparator. Read More...

Dual-output reference drives up to 200 mA

Each output of the LT6658 voltage reference from Linear Technology is configurable for any voltage between 2.5 V and 6 V. Read More...

SAR ADCs ease field testing

Analog Devices’ AD400x series of 18-bit and 16-bit SAR ADCs enable test and measurement instruments to operate longer in the field. Read More...

TVS device stops ESD in its tracks

The RClamp0561Z from Semtech is a sub-200 femtofarad protection device that safeguards high-speed data interfaces from ESD and EFT. Read More...

Thin-film chip resistors boast low TCR

Offered in five case sizes, Vishay’s PLTU series of precision thin-film wraparound chip resistors provides tight TCR and tolerance. Read More...

MMBX connectors work up to 12.4 GHz

Pasternack’s small form-factor MMBX-type connectors and adapters have a maximum operating frequency of 12.4 GHz and VSWR of 1.06:1. Read More...

RS-485 transceivers meet IEC surge standards

Analog Devices’ ADM2795E and ADM3095E RS-485 transceivers are among the first to be fully certified for Level 4 EMC surge protection. Read More...

RF MEMS switch passes 14 GHz signals

The ADGM1304 quad RF MEMS switch from Analog Devices could replace electromechanical RF switches, improving reliability and saving board space. Read More...

Chip resistors withstand high surges

TT Electronics has added small 0603 size chips to the PWC and DSC series of surface-mount thick-film resistors. Read More...

Add waveforms to your PXI system

Spectrum Instrumentation's 1, 2, and 4-channel AWGs let you add analog signals to an automated test system to simulate actual conditions. Read More...

Connector maker adds USB line

CUI now offers a line of USB 2.0 and 3.0 connectors, including Type A, Type B, Micro AB, Micro B, Mini AB, and Mini B versions. Read More...

High-voltage PXI oscilloscope lets you create your own instruments

The PXIe-5164 from National Instruments adds FPGA technology to let you program your own instrument after digitizing signals. It also supports a wide range of voltage inputs. Read More...

Gamma buffer optimizes auto LCDs

Intersil’s ISL76534 14-channel programmable gamma buffer ensures consistent brightness and color matching in automotive TFT LCDs. Read More...

AFE device monitors power quality

With embedded power-quality algorithms and integrated ADCs, the ADE9000 AFE IC from Analog Devices extends the life of industrial equipment. Read More...

Zero-ohm jumper chip handles 6 A

Furnished in a surface-mount 0603-size ceramic chip, TT Electronics’ LRZ0603 zero-ohm jumper permits optional connections on PCB assemblies. Read More...

Comparator shrinks PCB space requirements

Occupying less than 1 square millimeter, the TS985 rail-to-rail comparator from STMicroelectronics operates from a supply as low as 1.8 V. Read More...

AFE device monitors heart rate

Housed in a tiny WLCSP, the AD8233 analog front-end IC from Analog Devices enables smaller, lighter, and less obtrusive cardiac monitoring. Read More...

Power detector boasts high dynamic range

Linear Technology’s LTC5596 RMS power detector has a wide RF input bandwidth of 100 MHz to 40 GHz with a linear dynamic range of 35 dB. Read More...

Automotive ICs help shrink ECU size

AEC-Q100 Grade 0 analog ICs, the LM2904WHYST dual op amp and LM2903WHYST dual comparator from STMicroelectronics, come in MiniSO8 packages. Read More...

MEMS ICs detect structural defects

Three-axis accelerometers, Analog Devices’ ADXL354 and ADXL355 enable the early detection of structural defects via wireless sensor networks. Read More...

RMS detector computes real power of an RF signal

Addressing challenges of the fast-evolving wireless network market, Linear Technology’s LTC5596 RMS power detector will give accurate power measurement of RF and microwave signals independent of modulation and waveforms. Read More...

Rx/Tx converters span 800 MHz to 4000 MHz

The HMC8100 and HMC8200 Rx/Tx converters from Analog Devices replace multiple discrete parts in microwave backhaul applications. Read More...

RF modules ease prototyping

Analog Devices’ HMCx RF and microwave modules aim to shorten the proof-of-concept phase of the design cycle and increase time to market. Read More...

Demo board packs 50-Msample/s DAC

The DC2459A demonstration circuit from Linear Technology accepts digital signals from one of several FPGA development boards. Read More...

CAN transceiver wards off ground potentials

A CAN µModule from Linear Technology, the LTM2889 separates grounds by isolating the CAN transceiver using internal inductive isolation. Read More...

RS-485 receivers occupy tiny footprint

Delivering data rates of 52 Mbps, RS-485/RS-422 receivers in the XR3318x series from Exar come in 3×3-mm, 5-pin or 6-pin TSOT23 packages. Read More...

Valencell and Jabra team up to create the most accurate wireless earbud device

Next generation earbuds are going truly wireless to provide accurate and convenient health insights during your workout. Read More...

RF front-end module outputs +20 dBm

Teamed with a TI CC1310 wireless MCU, the SKY66115-11 front-end-module from Skyworks offers long-range communications from 470 MHz to 510 MHz. Read More...

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Teardown: Ruggedness and flexibility keep PLCs strong in industrial

A teardown of an Allen-Bradley (Rockwell Automation) Micro850 programmable logic controller, the epitome of rugged industrial control, shows that optocouplers are the go-to technology for reliable isolation, while flexibility and easy programmability using modern languages remains key to PLC’s longevity. Read More...

Teardown: The Engineer’s Mind

For this teardown episode, the recent Mind of the Engineer Study provides a view of your perception of the engineering mind: What you think of you, and what you think others think of you. There are some surprises, some affirmations, and of course some fun twists. Read More...

Teardown: Maxwell's equations

If Maxwell's Equations were a piece of hardware, most of us would be eager to see what's inside the box. But you won't find the literary equivalent of a physical teardown because the subject is basically mathematical and as such, requires a certain amount of rigor to explain and understand. If you're willing to trade mathematical rigor for readability, this article may be the refresher you've been looking for. Read More...

Teardown: The nuances of variable-frequency drives

Get an inside view of induction-motor control by varying frequency using PWM. Read More...

The Scrubbing Bubbles power sprayer

A brilliant design costs you only pennies per spritz. Read More...

The 24V, 300W, BLDC Kollmorgen motor integrated controller

A motor mixes mechanical and electrical beauty with questionable thermal design. Read More...

The Tektronix 1101 oscilloscope-probe power supply

A mechanical design is at once a masterpiece and an expensive expedient. Read More...

Bulldog Security RS82B remote-vehicle-starter system

Microprocessor-controlled relays let you start your car 100 yards away. Read More...

The 15W Fender Squier guitar amplifier

Replacing all of the potentiometers makes a scratchy old amp sound great again. Read More...

The Schauer TB10012 battery charger

A 30-year-old nonworking battery charger makes a perfect Prying Eyes candidate—and gets a new lease on life. Read More...

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Moving to improve automotive safety with MEMS scanning mirror technology

During the MEMS & Sensors Executive Congress, Jari Honkanen from MicroVision showed off amazing MEMS moving mirror technology. Read More...

Understanding and designing differential filters for communications systems

Understand how to transfer a single-ended filter design to a differential filter design, and optimize your PCB design. Read More...

Mission to Pluto: An interview with New Horizons' “MOM”

I had a recent interview with Alice Bowman, NASA’s New Horizons Mission Operations Manager, and posed what I thought might be some interesting questions for our EDN audience regarding the New Horizons spacecraft. Read More...

Isolated LVDS buffers for high-speed, high-voltage isolation

Isolation is a means of preventing DC and unwanted AC between two parts of a system, while still allowing a signal and power transfer between those two parts. Read More...

What a circuit designer needs for a robust, wearable health sensor system design

The MAXREFDES100# health sensor platform helps designers see and evaluate the features of the ICs that need to be properly integrated into a full architectural system. Read More...

An NFC-enabled multi-parameter bio-signal monitor for wearable systems

In-home monitoring is a growing trend, where patients monitor their vital signs on their own. Bio-signal sensor data can be transmitted wirelessly through NFC to a smartphone for remote monitoring by a healthcare professional. Read More...

FILTRON: Optical filters for CMOS integrated photodetectors

Optical filters on CMOS integrated photodetectors make optoelectronic sensors possible for wavelengths from the ultraviolet to the near-infrared range. Read More...

High-speed connections require RS-485

RS-485 is the chosen physical layer standard for numerous industrial communication systems. Here we look at the key design considerations engineers should keep in mind with high-speed data transmission. Read More...

MEMS oscillator reduces dropped calls in base stations

Vibration causes dropped calls and loss of data links in base station small cells because of the quartz resonator’s sensitivity. Using a MEMS oscillator enhances quality of service. Read More...

How to design inductive touch-on-metal button panels

By sensing tiny deflections of a metallic panel, an inductance-to-digital converter is able to turn a thin sheet of metal into a highly reliable ToM button panel without any moving parts. Read More...

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Use plastic optical fiber for isolation

Consumer audio components create low-cost HV isolation, and a reliable, secure physical connection. Read More...

Enhancing audio system designs with digital signal processing

You don't have to be an audio DSP/embedded software geek to effectively design audio systems with microphones to enhance the system performance. Read More...

What I learned about LTE-M at the MEMS & Sensors Executive Congress 2016

MEMS & Sensors Executive Congress keynote speaker Cameron Coursey, from AT&T, presented "The Future of Sensors and MEMS in the Internet of Things." Read More...

Halloween Robots: Trick or Treat?

It’s Halloween and as you are working in your office or lab, you hear behind you the soft whir of a motor and then are startled by a voice that says, "Happy Halloween! Please take some candy, then press the done button." Read More...

Node analysis: A different perspective

When we decided to become electronics engineers, we were introduced to two enshrined methods of analyzing circuits, node and loop analysis. Here we see how analysis can get complex if the circuit under consideration is itself complex. Read More...

Incandescent lamps and service life

Yes, incandescent lamps are still with us. A lamp's service life can be extremely brief or it can extend for many hours, days, months, years, or even decades. Read More...

LED bulbs can bring heat

When the base of an LED bulb seems hot to the touch, some testing is in order. Read More...

MesoGlue will not replace solder

MesoGlue is a room temperature metallic glue created with some brilliant science, but it’s not ready to replace solder in the engineering world. Read More...

Toroid characterization

How do you find an inductor for a switch-mode power supply whose nominal inductance value would be 100 µHy? Read More...

Taking a look at non-imaging optics

Not every optical device is involved with the art of presenting images. Read More...

Audio lectures from 1960: High-frequency transistors

Transistors were new to many engineers in 1960, so EDN explained how to use high-frequency transistors in a four-part series using printed pages and phonograph records. You can read and hear the complete series here. Read More...

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