1808 results found for Analog /Mixed Signal, displaying items 1 - 20
November 16, 2009[TechView: Communications] 1-Gsample/s ADC FIts Advanced Wireless Applications
The Texas Instruments ADS5400 analog-to-digital converter (ADC) provides a 1-Gbit/s sample rate with a resolution of 12 bits. With its superior signal-to-noise ratio (SNR) and spurious-free dynamic range (SFDR), it’s ideal for extra-needy wireless applications like receivers for radar, electronic intelligence and jamming, and super-highspeed data acquisition. The ADS5400 offers an excellent SNR of 59 dBFS and 75-dBc SFDR in first...
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Louis E. Frenzel
November 16, 2009[Ideas For Design] IC Simplifies Support For FIPS 140-2 Level 4 Digital Encryption
Many solutions exist to supply Federal Information Processing Standard (FIPS) Revision 2, Level 1 and Level 2 digital encryption.1 However, Levels 3 and 4 require monitoring of the environment. Level 3 could be implemented with tamper switches, but they can be bypassed with jumpers or a paper clip. More sophisticated switch sensors require some filtering and deglitching. Level 4 requires monitoring of the supply voltages and temperature. For best...
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John R. Ambrose
, et al.
November 16, 2009[Ideas For Design] Adjustment-Free Fan Controller For Under $1
No frills here—just inexpensive functionality. This circuit activates a cooling fan when the temperature of a target high-power-dissipation device, such as a processor chip, exceeds a predetermined limit. The key element in the design is the Epcos PTC Temperature Limit Sensor (see the datasheet at www.epcos.com/inf/55/db/ptc_03/01900191.pdf), which cost about $0.50....
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Jim Keith
November 5, 2009[Pease Porridge] What's All This 2401BG Stuff, Anyhow?
Back about 1965, when I was at Philbrick, we were doing some business with Amelco Semiconductor. I had designed a good hybrid op amp (the Q85AH) and Amelco was trying to build it, but they had some test problems, and some yield problems... so I flew out to help find and solve their problems. The first morning, I put in an hour looking at their test setup. Nothing showed up right away. So we went over to their cafeteria for a cup of coffee. Several engineers ...
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Bob Pease
November 5, 2009[Design FAQs] Clocking Data Converters Sponsored by: ANALOG DEVICES
What is the most critical performance characteristic for clock chips used with high-performance data converters? The clock signal’s phase noise (or jitter— the time-domain representation of phase noise) is the most critical spec. But also, pay attention to the band over which the jitter has been integrated. Phase noise limits signal-to-noise ratio (SNR). For converter applications, broadband RMS additive jitter is a good...
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Don Tuite
November 5, 2009[Ideas For Design] Garage Door Opener Parts Form IR Intrusion Detector
While creating an infrared beam intrusion detector system, the need for a beam-focusing method became evident. Parts from a modified Genie garage door Safe-T-Beam system, purchased at the local home improvement store, proved to be perfectly suited to the application. The main reason for choosing the Genie unit is that the IR transmitter and receiver housings each contain a plastic lens inside a short plastic tube molded into the housing. The tube and lens...
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Bert Henscheid
November 5, 2009[Engineering Essentials] Motor-Control Resources
A good general view of field-oriented control (FOC) can be found in Texas Instruments’ 1998 white paper, “Field Orientated Control of 3-Phase AC Motors”, which can be downloaded for free. For a more recent treatment, though its references go back at least as far as 1980, readers can check out “A Seamless Whole Speed Range Control of Interior PM Synchronous Machine without Position Transducer” by Filka, Balazovic, and...
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Don Tuite
, et al.
November 5, 2009[Engineering Essentials] A Multi-Level Approach Makes Understanding Motor Control Easier
Regardless of their primary field, sooner or later, most designers have to deal with motor controls. Broadly speaking, there are two methods to incorporating these components in your design. First, designers can start with one of the many choices of microcontrollers that are available and then address the challenges of making the control do what they want. Or second, designers can start at the other end and examine the interaction between motors and...
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Don Tuite
, et al.
October 22, 2009[Engineering Feature] Engineers Give Back 2008 Gains In 2009
The news media is constantly hyping the latest poll. Whether it’s what people think about healthcare, Afghanistan, or the latest contestants on So You Think You Can Dance, someone somewhere is always telling us what somebody else is thinking. But here at Electronic Design, we know what really matters to you. That’s why we conduct our engineering salary and opinion survey every year. Our annual survey provides the industry’s most complete...
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Jay McSherry
October 22, 2009[Engineering Feature] Where Are All The Jobs?
Federal Reserve chairman Ben S. Bernanke caused a bit of a stir last month when he said that from a “technical perspective,” the recession is “very likely” over at this point. From a less technical perspective, he added that it could be months before unemployment rates dropped significantly. In fact, the Consumer Electronics Association’s U.S. Economic Forecast is projecting the unemployment rate for the country at 9.9% in 2010 and expects it to improve to only...
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Ron Schneiderman
October 22, 2009[Ideas For Design] Simple Circuit Provides Latching Fault Protection
Most switching power-supply controllers provide non-latching fault protection. Satisfying a requirement for a latchoff response to a fault often requires the addition of excessive and redundant circuitry. For power-supply controllers with an external soft-start pin, however, a simple circuit can be added to convert its non-latching fault protection into one with latched protection. For typical controllers, the startup sequence begins by charging the VDD...
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Brian King
October 9, 2009
[Engineering Feature] The Outsourcing Reality
Outsourcing has become a way of life in the engineering community as most OEMs continue to farm out work both domestically and overseas. With years of experience in outsourcing now under their belts, companies seem to have a better sense of where they’re willing to take the risk of handing over design, development, and manufacturing to others.
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Jay McSherry
October 9, 2009
[Engineering Feature] Who's Hiring?
Reflecting the realities of the current job market, only 10% of the respondents to our 2009 Salary Survey said they would be actively seeking a new position this year. About 60% said they would follow up if they heard about an interesting opportunity or were approached with an offer, while the remaining 30% couldn’t envision changing jobs in the foreseeable future. So, who's actually hiring?
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Jay McSherry
October 8, 2009[Design View / Design Solution] Control Jitter And Interference During Clock Distribution
Several practical issues must be addressed when designing the clock tree for a system running synchronously at high speed. First is the signal integrity of the clock itself, i.e., maintaining low jitter and low distortion all the way to the receiver. Second is controlling clock interference with other parts of the system, as well as compliance with electromagnetic- interference (EMI) regulations. These issues are easy to understand, but hard to practice...
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Lin Wu
October 8, 2009[Ideas For Design] Improved Electronic Birthday Candles Provide Better "Blow Out" Simulation
An earlier Idea for Design described LED “candles” that you could blow out just like normal birthday candles (“Electronic Birthday Candles ‘Blow Out’ One At A Time”). A thermistor and heating resistor combination detected air blown over the thermistor. The control circuit incorporated an 8-bit shift register, a quad op amp, and driver transistors, allowing up to eight ...
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Dhananjay V. Gadre
, et al.
October 8, 2009[Leapfrog: First Look] MEMS Digital Dual-Axis Gyro Improves Camera Stabilization
Addressing lower-cost opticalimage stabilization (OIS) as a major goal, InvenSense Inc. has unveiled the first digital dual-axis pitch and roll (X and Y) gyroscope for camera phones and digital still cameras. Its nextgeneration IDG-2000 family offers the smallest such devices on the market, housed in a 4- by 4- by 0.9-mm quad flat no-lead (QFN) package (Fig. 1). The chip is designed for OIS...
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Roger Allan
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