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posted in January 2005
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."


Radio
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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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