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.

Interleaved LED drive

LED displays often operate with current pulses delivered to the individual devices at some particular duty cycle. In this case, six LEDs were being pulsed in that fashion. Read More...

A checklist for designing RF-sampling receivers

Recently introduced data converters are delivering the high dynamic range comparable to high-performance intermediate frequency (IF)-sampling data converters. Read More...

Wake up and listen: Vesper quiescent-sensing MEMS device innovation

Vesper claims the industry’s only wake-on sound microphone that enables always on listening capability at practically zero power-draw. Read More...

Honoring the late analog great Bob Pease

Everyone wants to be somebody, no one wants to become somebody. Bob Pease became the most famous analog designer with hard work and a passion for helping others, and five years after his death, he is still missed by many. Read More...

Modular AWGs: How they work and how to use them

Arbitrary waveform generators are inverse digitizers; the results you get depend on how you use them. Read More...

The optoelectronics inside activity trackers

Wearable devices can measure a wide variety of body functions, and optoelectronic components play a key role in measuring these attributes. Read More...

NASA Space Station’s top 10 benefits to humanity

Here are some of the exciting and fruitful efforts we have seen from research on the ISS that have and will benefit us here on Earth. Read More...

Remembering Jim Williams, 5 years later

The world is a lesser place without Jim Williams fixing our problems. Here we take the time to remember the analog great five years after his passing. Read More...

Vacuum tube technology resurrected

On this 60th anniversary of EDN, we look back to 1956 when the vacuum tube was at its maturity and transistors were about to begin their domination. Read More...

Fix poor capacitor, inductor, and DC/DC impedance measurements

Improved measurement technique extends the range and improves the accuracy over standard S-parameters. Read More...

The intricacies of signal integrity in high-speed communications

This article addresses the issues with high-speed signals and how to mitigate problems through proper component selection and board layout. Read More...

Cable shields

Of the different choices that are available for grounding a shield braid that encloses a differential pair of signal wires, please consider that the shield braid be grounded only at the signal source, at the input end, and not at the output end. Read More...

LM317 smooths but doesn't regulate

I once needed to clean up a power supply output, but it didn't need to be regulated. Read More...

Simulate thermocouples, check indicators and processes

The P470 thermocouple simulator from Highland Technology lets you simulate thermocouples, which can provide a "sanity check" for indicators and control systems. Read More...

Enabling robust data communications within a high voltage BMS

Achieving reliability, performance, and longevity of battery packs is the primary purpose of the BMS (battery management system). Read More...

NI introduces PXIe 7.5-digit DMM

The NI PXIe-4081 brings the accuracy of its PXI predecessor to PXI Express. Read More...

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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...

Add phases to simple RC oscillator

Here’s a simple way to add one or more output phases to an RC oscillator. Read More...

555-based class-D headphone driver makes great practice amp

This class-D audio amp “plays” to the 555’s strengths. Read More...

LTC Design Note: Robust 10MHz reference clock input protection circuit and distributor for RF systems

Design a protected 10MHz reference input without degrading phase noise. Read More...

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Tiny motion sensor fits wearable devices

Bosch Sensortec’s BMX160 is a 9-axis motion sensor touted as the smallest in the industry for wearable and augmented/virtual-reality devices. Read More...

Wake up and listen: Vesper quiescent-sensing MEMS device innovation

Vesper claims the industry’s only wake-on sound microphone that enables always on listening capability at practically zero power-draw. Read More...

Resolver-to-digital converter trims board space

A resolver sensor interface, the PGA411-Q1 from Texas Instruments integrates a power supply, exciter amplifier, and safety features. Read More...

I/Q modulator works up to 6 GHz

Powered by a single 2.7-V to 3.6-V supply, the LTC5589 direct conversion I/Q modulator from Linear Technology draws only 29.5 mA of current. Read More...

USB oscilloscopes add waveform generators

TiePie Engineering has added a waveform generator to its line of USB oscilloscopes, which the company claims is a unique design. Read More...

ADC eases analog front-end design

The LTC2311-16 from Linear Technology is a 16-bit, 5-Msample/s SAR ADC with differential inputs and a wide input common-mode range. Read More...

Digital isolators lower component count

Maxim’s MAX14933 and MAX14937 bidirectional isolators transfer signals between circuits with galvanic isolation between two power domains. Read More...

Reference design calculates force and mass

Engineers can evaluate and deploy HMI (human machine interface) devices using the MAXREFDES82# smart force reference design from Maxim. Read More...

Increased support for RF MIMO Systems design and development from MathWorks

MathWorks has made some crucial updates to the RF Toolbox, SimRF, and Antenna Toolbox to aid designers of next generation wireless systems. Read More...

Generate analog and digital signals on the bench

The AWG4162 from Tektronix combines two types of analog outputs with a digital pattern generator. Read More...

Audio line filter vanquishes noise

When inserted in audio lines, TDK’s MAF1608G noise suppression filter for cellular bands keeps the THD+N of the audio signal at 0%. Read More...

Analog Devices RadioVerse technology: Simpler wireless system design

The new ecosystem includes the AD9371 integrated wideband RF transceiver, enabling simple, versatile solutions for wireless infrastructure, aerospace and defense, and instrumentation applications. Read More...

16-V op amps maintain high precision

Comprising four devices, the TSX7 series of 16-V rail-to-rail op amps from STMicroelectronics exhibits an offset voltage of less than 200 µV. Read More...

Silicon Labs timing technology for coherent optical market

The single-chip Si534xH clock family provides a high-performance, frequency flexible timing solution for 100G/400G transceivers. Read More...

Current sensor supplies 1-MHz analog output

Allegro MicroSystems’ ACS730 Hall-effect current sensor provides 1-MHz bandwidth and a fast response time of 210 ns. Read More...

Automotive position sensors are safety-compliant

Magnetic angular position sensors from ams, the AS5170 and AS5171 meet the ISO 26262 functional safety standard for road vehicles. Read More...

Transceivers strengthen Profibus networks

The LTC2876 and LTC2877 RS-485 transceivers from Linear Technology tolerate ±60 V on their bus pins to protect Profibus-DP networks. Read More...

36-V op amps reduce supply-current needs

The dual TSB572 and single TSB611 BiCMOS op amps from STMicroelectronics have a wide supply range and tolerate ESD up to 4 kV HBM. Read More...

Current sensors reject common-mode fields

Allegro’s 5-V ACS724KMA and 3.3-V ACS725KMA ICs perform AC or DC current sensing in systems that require very high-voltage isolation. Read More...

LED controllers are digitally enhanced

Two analog power controllers from Microchip, the MCP19116 and MCP19117 enable intelligent, configurable, and accurate LED lighting. Read More...

Low-jitter clock IC covers wide frequency range

An integer-N PLL with an integrated VCO, the LTC6951 from Linear Technology furnishes multiple clock outputs between 1.95 MHz and 2.7 GHz. Read More...

Multiprotocol transceiver saves board space

Housed in a small QFN package, the LTC2873 transceiver from Linear Technology handles RS-232, RS-85, and RS-422 communications. Read More...

Mixer’s IF bandwidth spans DC to 6 GHz

A double-balanced mixer, the LTC5548 from Linear Technology operates as an up or down converter over a frequency range of 2 GHz to 14 GHz. Read More...

5-V multiplexers are radiation-tolerant

Two analog multiplexers from Intersil, the 16-channel ISL1830SEH and 32-channel ISL71831SEH operate from a single 3-V to 5.5-V supply. Read More...

PLL/VCO combo ICs trim phase noise

Two wideband RF PLLs with integrated VCOs, the LMX2582 and LMX2592 from Texas Instruments, meet the multicarrier wireless GSM standard. Read More...

Power-stingy RF transceiver covers ISM band

Operating between 779 MHz and 965 MHz, the ZL70550 RF transceiver from Microsemi boasts best-in-class low-power characteristics. Read More...

IO-Link transceiver halves power dissipation

With typical driver on-resistance of 2.5 Ω, the MAX14827 IO-Link dual transceiver from Maxim saves more than 50% power dissipation. Read More...

What good is state-of-the-art high-speed electronics without good connectivity?

We often tend to forget about connectors and cables when we discuss the amazing speeds and bandwidths in today’s systems. Read More...

18-bit ADC touts multiplexed inputs

The LTC2335-18 from Linear Technology is an 18-bit, 8-channel SAR ADC with independently configurable input voltage ranges. Read More...

ALD rolls out P-channel version of EPAD MOSFET

Advanced Linear Devices has launched its first P-channel EPAD MOSFET array, the ALD310708, which provides a gate threshold of -0.80 V. 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...

>> SEE ALL

A checklist for designing RF-sampling receivers

Recently introduced data converters are delivering the high dynamic range comparable to high-performance intermediate frequency (IF)-sampling data converters. Read More...

Honoring the late analog great Bob Pease

Everyone wants to be somebody, no one wants to become somebody. Bob Pease became the most famous analog designer with hard work and a passion for helping others, and five years after his death, he is still missed by many. Read More...

The optoelectronics inside activity trackers

Wearable devices can measure a wide variety of body functions, and optoelectronic components play a key role in measuring these attributes. Read More...

NASA Space Station’s top 10 benefits to humanity

Here are some of the exciting and fruitful efforts we have seen from research on the ISS that have and will benefit us here on Earth. Read More...

Remembering Jim Williams, 5 years later

The world is a lesser place without Jim Williams fixing our problems. Here we take the time to remember the analog great five years after his passing. Read More...

The intricacies of signal integrity in high-speed communications

This article addresses the issues with high-speed signals and how to mitigate problems through proper component selection and board layout. Read More...

Enabling robust data communications within a high voltage BMS

Achieving reliability, performance, and longevity of battery packs is the primary purpose of the BMS (battery management system). Read More...

Linearization of sense element outputs using sensor signal conditioners

In this article, we investigate two methods that are widely used to correct for sense element nonlinearity: look-up table or interpolation and polynomials or curve-fitting. Read More...

Capacitive vs. thermal MEMS for high-vibration applications

What should design engineers developing heavy equipment that operates in high shock and vibration environments consider when choosing an accelerometer to measure inclination? Read More...

NASA’s Charles Elachi: An immigrant inspiring leadership and opportunity in America

Get to know Dr. Charles Elachi, who has served as director of NASA's JPL for the last 15 years. Read More...

>> SEE ALL

Vacuum tube technology resurrected

On this 60th anniversary of EDN, we look back to 1956 when the vacuum tube was at its maturity and transistors were about to begin their domination. Read More...

Cable shields

Of the different choices that are available for grounding a shield braid that encloses a differential pair of signal wires, please consider that the shield braid be grounded only at the signal source, at the input end, and not at the output end. Read More...

A plea for one connector, one cable, one display

After 40 years of hard work the personal computer is broken, as this quest to display Windows 7 on four monitors attests. Read More...

Y-factor and antenna testing

Typically, this technique would be applied to an RF or microwave amplifier, but it can be applied to antenna testing as well. Read More...

Tube amps and audio goodness

Check out these great audio resources and if you have some favorite tube or vintage audio site, or audio book, let us know. Read More...

GaN RF power transistors: Not just power, but speed to L-Band and beyond

GaN power transistors have been quickly gaining momentum in the power and high frequency application space and not just overtaking Silicon in power and RF, but also GaAs in the microwave arena. Read More...

Wet and dry switching

You may have come across two terms about using relays for switching, "dry" and "wet." This is a clarification of the terms. Read More...

RF impedance matching for rocket scientists

RF impedance matching has become a major challenge for many satellite OEMs wanting to offer the benefits of high-throughput digital payloads to spacecraft operators. Read More...

Silicon Labs timing technology for coherent optical market

The single-chip Si534xH clock family provides a high-performance, frequency flexible timing solution for 100G/400G transceivers. Read More...

Sensing current on the high side

Here are some ways to sense current in a supply rail, which requires care to do right. Read More...

60 Years of Design Ideas and EDN: A reminiscence and challenge

The Design Ideas editor looks back…and forward. Read More...

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