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Dear Sir/Madam
When you use your mobile devices like cell phones, laptops or PDAs you would not imagine, that a linear component - RF power amplifier – is used to ensure the proper operation of all of these digital devices. For those of you who are designing analogue circuits in the “digital world” we collected appropriate information in this newsletter. Enjoy!
Wolfgang Patelay
Technical Editor, EPN
7W Buck LED Driver (Catalyst Semiconductor)
Delivered in a 5-lead TSOT-23 package, the CAT4201 buck converter is optimised for driving high-brightness, 350mA LEDs at up 94% efficiency. The chip incorporates Catalyst's patent-pending switching-control algorithm, which reduces system complexity, improves efficiency and allows an external RSET control resistor to preset a regulated LED current up to 350mA from supplies as high as 24V.
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4-Channel LIN Transceiver (Melexis)
The MLX80001 is 4-channel LIN transceiver IC that significantly reduces automotive-system costs of the LIN physical layer compared to multiple single-transceiver ICs found in, for example, a body-control module.
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Motor-Driver IC (Allegro Microsystems)
The A1442 from Allegro MicroSystems is a full-bridge motor-driver integrated circuit that is optimised for driving vibration motors in applications such as mobile telephones, pagers, electronic toothbrushes, hand-held video-game controllers and low-power fan motors.
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Sub-1GHz RF Transceiver (Texas Instruments)
A sub-1GHz radio-frequency transceiver, the CC1101 targets low-power wireless applications in alarm and security, automatic meter reading and industrial or building control and monitoring. The chip is designed for the ISM- and short-range-device frequency bands at 315, 433, 868 and 915MHz.
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Taking a Bite out of Power: Techniques for Low-Power ASIC Design
Even if you are designing an ASIC or SOC that doesn´t target a low-power application, you need to become familiar with low-power design techniques, because the newest generation of silicon-process technologies inherently leaks power. More about low-power design techniques you´ll find in the article by Senior Editor Michael Santarini in EDN.
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Creating the Power Subsystem in Modern Design
Power – from linear to digital – covers a range of design choices. This brief overview by EDN´s Technical Editor Paul Rako presents designers with some of the design options open to them, and some of the problems they may encounter.
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Build a complete industrial-ADC interface using a microcontroller and a sigma-delta modulator
Designers commonly use 0 to 20mA, 0 to 10V isolated inputs for industrial-application-control signals. A combination of isolated supplies, the built-in isolation of an Analog Devices AD7400 sigma-delta modulator, and a Texas Instruments MSP430 microcontroller creates a design for industrial designers requiring complete, isolated, and robust analogue signal interfaces. A precise signal-conditioning circuit generates the small differential voltage that the AD7400 requires. The circuit in the Design Idea by Patrick Weber and Craig Windish from Siemens Energy and Automation generates the required 200-mV differential voltage.
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Recycle precision potentiometers as useful voltage sources
An analog- or a mixed-signal lab cannot have too many voltage sources. Engineers often use a dc power supply because it is the only thing they can find, and many labs lack a true voltage-calibration source. This Design Idea by Mark Thoren from Linear Technology describes a circuit that recycles old precision potentiometers that have direct reading scales into useful laboratory volt boxes.
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4| Market Research |
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Wireless 4G Technology Beginning To Shape Up
Although an official definition of wireless 4G technology will not be released until the 2008/2009 timeframe in the form of the ITU’s IMT-Advanced requirements, there are already clear contenders for the designation, reports In-Stat. The primary 4G technologies of the future are expected to be Long Term Evolution (LTE), Ultra Mobile Broadband (UMB), and IEEE 802.16m WiMAX, the high-tech market research firm says.
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5| Book of the Month |
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Switchmode RF Power Amplifiers, by Andrei Grebennikow and Nathan Sokal
Switching mode RF amplifiers have been theoretically possible for decades, but were largely impractical because they distort analogue signals until they are unrecognizable. However, distortion is not an issue with digital signals - like those used by WLANs and digital cell phones - and switching mode RF amplifiers have become a hot area of RF/wireless design. This book explores both the theory behind switching mode RF amplifiers and design techniques for them.
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