164 results found, displaying items 81 - 100

Hypothesis: Doing away with the code requirement last March has completed a rejuvenation of ham radio that was triggered by the World Trade Center attacks and Katrina. I’m looking for reader comments yea and nay.

The Global Semiconductor Alliance’s Analog/Mixed-Signal/Radio Frequency (AMS/RF) Process Checklist Version 1.0 aims to make it easier for semiconductor companies to obtain information on an AMS/RF foundry process. It specifically targets the information need to evaluate a foundry’s AMS/RF process and determine if it addresses all of the company’s needs.

Designers can construct a triangular additive dither that only requires two pulse-width modulators and an XOR gate. However, it may be possible to dither without any additional hardware at all.

The HVVFET is the brainchild of HVVi chief technology officer Bob Davies, one of the key inventors of LDMOS 15 years ago. Devices utilize a vertical FET structure (something that’s been tried before) because it provides higher power density than lateral devices. The problem with those early efforts were the parasitics associated with silicon substrates. That limited operating frequencies. For HVVi, Davies came up with a novel edge termination structure and a unique gate-drain ...

You don’t want to burden your design with the extra cost of a higher-resolution analog-to-digital converter (ADC). But because of board-space limitations, adding an external ADC may not be acceptable. Fortunately, you can get 10-bit performance with an 8-bit ADC by implementing triangular dither.

Check out these additional letters to and answers from electronics guru Bob Pease.

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.

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 ...

You don’t want to burden your design with the extra cost of a higher-resolution ADC. And because of board-space limitations, adding an external ADC may not be acceptable. Fortunately, you can get 10-bit performance with an 8-bit ADC by averaging multiple samples. This process is called oversampling.

High-side current-sense amplifiers are used in a wide variety of applications where reliability and accuracy are paramount concerns. In computer notebooks, these devices monitor the battery’s charge and discharge currents, as well as currents in USB ports and many other supply rails that may need to be powered down to control heating and power dissipation.

Designed in collaboration with SiRF Technology Inc., austriamicrosystems’ new AS3650 power and audio management unit is an excellent fit for personal navigation devices (PNDs) using SiRF’s navigation processors. The AS3650 is a highly integrated device that includes power management, battery management, linear and USB charging, a backlight driver for various screen sizes, and a touch-screen interface.

Maxim's MAX2120 direct-conversion tuner receives QPSK signals in the 925- to 2150-MHz range and downconverts them to baseband for demodulation.

The inverting MCP1401 and the non-inverting MCP1402 single-output MOSFET drivers from Microchip Technology are rated for a peak output current of 0.5 A over a wide operating range of 4.5 to 18 V.

This not-so-little jewel has 2072 pages and weighs 11 lbs. (yes, I actually weighed it). My initial reaction was that I don't have much to do with broadcast standards or technology, but after I read the book I found it was a fabulous reference on electronics, wireless, and communications in general...

Measuring less than 50 atoms wide and one atom thick, Andre Geim's graphene transistor may represent the best hope yet for delaying the expiration of Moore's Law. "Silicon will run out of steam in about 20 years," predicts Geim, a professor of condensed matter physics at England's University of Manchester. "We have to meet the challenge of keeping up with Moore's Law."

Seiko Instruments picked Infineon Technologies' SMARTi 3G single-chip CMOS radio frequency (RF) transceiver for its C01SI UMTS /HSDPA data card.

• Whatever Happened To Heathkit?
• Precision DC motor speed controller
• Hot Hands For Some Cool Rock: Motion Sensing Meets Audio Engineering
• Voltage-To-Current Converter Works From A Single-Supply Rail
• Control circuit keeps dc motor running at constant speed