1478 results found for Analog /Mixed Signal, displaying items 1 - 20
May 9, 2008
[IEF 2008] International Electronics Forum (IEF) 2008 Electronic Design's Editor-in-Chief Joe Desposito went a long way to catch the IEF. Catch up with him on his journey to Dubai, where IEF was held this year, and his expectations of the forum.
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Joseph Desposito
May 8, 2008
[TechView: Wireless] Fast Serial 16-Bit ADC Cuts Pin Count And PCB Space
Only two wires are needed to connect the 105-Msample/s LTC2274 ADC to an FPGA, reducing board space and decreasing noise and crosstalk. The serial interface can reach 2.1 Gbits/s, and it’s compatible with FPGAs like the Xilinx Rocket IO, Altera Stratix II GX I/O, and Lattice ECP2M I/O.
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Louis E. Frenzel
May 8, 2008[Analog/Mixed-Signal Design] Using Delta-Sigma Can Be As Easy As ADC
As an application engineer, I spend a lot of time convincing customers that a delta-sigma modulating analog-to-digital converter (ADC), or DSM, would be the best choice for their particular application. Then they come up with all sorts of excuses for why they prefer a successive-approximation ADC. I’ve come to the conclusion that they prefer successiveapproximation ADCs because they fundamentally don’t understand how a DSM works, perhaps because DSMs involve...
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Dave Van Ess
May 6, 2008
[TechView: Analog & Power] Higher-VBR MOSFETs Open New Design Opportunities
Several MOSFETs with higher breakdown voltages have hit the market. Some are rated for 40, 60, and 80 V, which is 10 V higher than existing devices in their respective classes, with significantly lower conduction losses. Others are rated for 900 V, again with improved conduction loss specs. At the high end of the breakdownvoltage range, Infineon Technologies is pushing the envelope with the industry’s first 900-V superjunction MOSFETs ...
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Don Tuite
May 8, 2008[Design View / Design Solution] Designing For High Speed In Current-To-Voltage Conversion
Communications channels used to be a challenging exercise in pure analog design. Today, modulation occurs in the digital domain in many systems. But the transmitted signal is analog, so there’s always a conversion. For any communications system, choices for the digital- to-analog converter (DAC) and its current-to-voltageconverting op amp depend on the required bandwidth. As DACs and op amps get faster, they move closer to the transmitting...
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John Ardizzoni
May 8, 2008[Pease Porridge] What's All This One-Transistor Op-Amp Stuff, Anyhow?
One day, back about 1966, I was going up the elevator at 285 Columbus Avenue in Boston to look at some production problems on Philbrick’s fifth floor. And who was in the elevator, but George Philbrick’s friend Jim Pastoriza. Jim was going up to show George his new analog computer demonstrator—portable and battery-powered. In fact, it was running, and he gave me a demo right on the elevator as we ascended. And, this modular analog computer ran on a couple of...
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Bob Pease
April 23, 2008
[Electronic Design UPDATE] Electronic Design Update: April 23, 2008
Like pretty much everyone else in the world of commerce, Underwriters Laboratories (UL) is moving aggressively to expand its operations globally, most recently becoming the first organization to provide third-party product certification to Mexico. In fact, the group has issued its first Normas Oficiales Mexicanas (NOM) marks to global electronics manufacturing customers entering the Mexican market.
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John Arkontaky
, et al.
April 24, 2008[Ideas For Design] Circuit Transfers Resistance Value Through Isolation Barrier
The circuit shown in the figure can monitor resistance in a noisy or otherwise hostile environment. A 1:1 transformer provides isolation and a good common-mode rejection ratio (CMRR). The resistance across the secondary winding is reflected to the primary, where it forms a voltage divider with resistor R1 (see the figure). This divider produces a reducedamplitude clock signal that's coupled through C2, rectified by ...
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Leo Sahlsten
April 24, 2008[Ideas For Design] Electronic Birthday Candles “Blow Out” One At A Time
This circuit creates a set of LED-based electronic birthday candles that are just as much fun as blowing out wax candles, but are also reusable, scalable, and even eco-friendly. It uses a thermal sensor that’s maintained at a temperature above the ambient temperature. When you blow air over the sensor, the resistance changes. The circuit detects this change and turns off the eight LEDs. When you stop blowing, all but one of the LEDs turn on. This cycle...
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Abhijeet Deshpande
April 24, 2008[TechView: Analog & Power] Single Chip Digitizes High-Side Power Measurements
Single Chip Digitizes High-Side Power Measurements In-circuit power measurements frequently involve a currentsense amplifier or a hot-swap controller and an analog-todigital converter (ADC). Optimally, the current sensing is done on the high side of the load to avoid false grounds. But one problem with that approach is the presence of a high common-mode voltage on the amplifier input. Another is the typical ADC’s limited input voltage range. In addition, the cost of...
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Don Tuite
April 24, 2008[TechView: Analog & Power] Monolithic Ultrasound AFEs Usurp Multiple Chips In New Designs
There are now two sources of analog front ends (AFEs) for ultrasound applications. Texas Instruments is sampling the AFE5805, the first member of a future family for portable to high-end ultrasound diagnostic equipment. Last year, Analog Devices introduced the AD9271 for the same market. Functionally similar, both are octal devices that incorporate a lownoise amplifier, variable gain amplifier (VGA), anti-aliasing filter, and 12-bit analog-to-digital...
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Don Tuite
April 24, 2008[Ideas For Design] Novel Switch Interface Scheme Reduces Microprocessor Pin Count
The most common method for interfacing multiple switches—multiplexing— allows for the connection of (N/2)2 switches with N microcontroller IO lines. The method described below, which has its roots in an LED interface technique commonly known as “Charlieplexing,” makes it possible to interface N*(N – 1) switches with N IO lines. In conventional multiplexing of an N-by- N matrix with 2N IO lines, half of the lines are configured for input and...
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Kartik Joshi
April 24, 2008[Pease Porridge] Bob's Mailbox
HELLO BOB, A note concerning electric cars and plugin hybrids: Consider that politics has little to do with engineering and/or science. It only pays lip service at those altars. So, somebody has to do serious planning for the immediate future. I’ve been working on some serious battery-charger designs. One of our planners (an engineer) did some research in good old California. We learned that your utility companies have ...
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Bob Pease
April 16, 2008
[Electronic Design UPDATE] Electronic Design Update: April 16, 2008
Fibre Channel (FC) has been the storage-area network (SAN) connection technology of choice for years. Competition from the Ethernet-based iSCSI has made SAN market inroads over the past few years, and there’s no doubt that increased competition will continue. However, FC certainly isn’t dead.
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John Arkontaky
, et al.
April 9, 2008
[Electronic Design UPDATE] Electronic Design Update: April 9, 2008
After effectively superseding the PCI bus, PCI Express interconnect technology is now entrenched in its early high-growth markets: PCs, workstations, servers, and storage systems. It has started to penetrate other markets as well, and it is on track to become more popular than any previous interconnect standard.
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John Arkontaky
, et al.
April 10, 2008[Pease Porridge] What's All This AMT Stuff, Anyhow? (Part 2)
I’ve often heard that if you’re going to owe the Alternative Minimum Tax, there’s nothing you can do about it. And that makes me scream! Most of these officious statements say you can postpone some income and defer the AMT, but you’ll just pay them next year. “There’s nothing you can do to avoid the AMT.” It’s a lie! I was absent-mindedly reading some of the boilerplate on some of my other investments. “You might like to buy some AMT-free bonds,” Dreyfus...
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Bob Pease
April 10, 2008[Embedded in Electronic Design] Full-Scale Simulation Means Analog And I/O
A simulation that’s an exact copy of a physical device would be ideal. Barring that, developers can choose from a range of simulation techniques that can replicate a device, allowing details such as timing and physical characteristics to be tracked through simulations that simply execute a program with no real interfaces. Different simulation methodologies provide insight into different aspects of a system. Tradeoffs are normally required to keep the...
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William Wong
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