Understanding HSDPA's Implementation Challenges Design How-To 1/28/2005 4 comments HSDPA promises to deliver "true" broadband data pipes to cellular networks. But it also brings with it a set of difficult engineering challenges. Fortunately, by using a software-based design, designers can address these challenges.
Under the Hood: Motorola's HS810 Bluetooth headset has analog calling Teardown 1/26/2005 Post a comment Analog technology figures prominently in this Bluetooth implementation, despite a fairly short component list. Central to the design is a single-chip Bluetooth component from Cambridge Silicon Radio (CSR) which integrates both digital baseband and RF radio into a single slice of CMOS. Also prominent is the interface to the audio world, a Motorola MC145483 13bit CODEC and a National Semiconductor LM4862 audio amplifier. From the January issue of Planet Analog magazine, David Carey goes Under the
How Intel, TI fare at 90 nm Teardown 1/10/2005 Post a comment Advanced Micro Devices, Altera, IBM, Intel, Sony and Texas Instruments have all introduced 90-nanometer logic devices over the past year. Of those companies, AMD, Intel and IBM have relied solely on internal manufacturing capabilities. The others chose to outsource at least some of their manufacturing to a foundry (Altera to TSMC, Sony to Toshiba and TI to UMC). As with every successful node, the goal of 90-nm process development is to reduce size and costs while improving performance.
Characterizing PC audio devices -- some challenges and their solutions Design How-To 1/5/2005 6 comments The ubiquitous PC is no longer just a sophisticated word processor or email tool; it's migrating into a personal jukebox or even the entertainment center of the home. But what level of audio performance do today's PC audio systems actually deliver? While 24-bit converters provide excellent THD+N specs, the PC environment is noisy and even the interconnections can degrade the overall system performance. An Audio Precision engineer offers insights into the measurements manufacturers can make to en
Meeting the Distortion Goals. The D/A Diaries, Part 3 of 3 Design How-To 1/4/2005 Post a comment It's 10 PM. You haven't slept or eaten properly for days. Hands shaking, you solder the lead frame of the new device to its test board: No chance of some loose connector fixture wrecking your measurements. All the confidence you thought you had before tapeout, simulating this over and over until you though you'd puke, now gives way as your mind imagines the worst-possible scenarios. In a moment, you'll know the truth Planet Analog is proud to reprise "The D/A diaries."
Blog Make a Frequency Plan Tom Burke 17 comments When designing a printed circuit board, you should develop a frequency plan, something that can be easily overlooked. A frequency plan should be one of your first steps ...