| Specifications | Rarely Asked Questions \Why recommend analog signal processing?\ RAQ, RAQs, Rarely Asked Questions, Bryant, analog processing, analog signal processing Analog Devices |
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| Specifications | Rarely Asked Questions \Why recommend analog signal processing?\ RAQ, RAQs, Rarely Asked Questions, Bryant, analog processing, analog signal processing Analog Devices |
| Business section |
| Specifications | Rarely Asked Questions \Why recommend analog signal processing?\ RAQ, RAQs, Rarely Asked Questions, Bryant, analog processing, analog signal processing Analog Devices |
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| Content | [designnews.com]04.24.06 DESIGN NEWS25 Rarely Asked Questions Strange but true stories from the call logs of Analog Devices SPONSOREDBY RAQ’s SPECIALADVERTISINGSECTION Have a question involving a perplexing or unusual analog problem? Submit your question to: A.Because sometimes analog signal processing is even cheap- er, and can do things that digital processing cannot. Sales of ana- log signal processing circuits support this. The Science Museum in South Kensington, London, was founded in Queen Victoria’s reign. Although it is imaginatively run and well worth a visit, it is scarcely renowned for its humor. On a recent visit to their computer science area, however, I laughed so much, and so loudly, that I bare- ly escaped arrest for disorderly behavior. The cause of my uncontrolled mirth was a glass case labeled, “Obsolete Analog Computing Technology,” containing, among other things, an AD534 analog multiplier. ADI has been making this device for more than 30 years, and it continues to generate substantial sales revenue. In fact there are a number of operations where analog processing has clear advan- tages over digital. Digital multiplication is simple and cheap, but if the original data and the required output are both analog, the cost and complexity of analog-to-digital converters (ADCs) and digital-to-analog con- verters (DACs) to convert from analog to digital — and back again — often exceed those of an analog multiplier. Also, the digi- tal propagation delay may be too great for a high-speed system. In addition, it may be more efficient to process the analog signals before the ADC, even if digital data is required. An example is ac power measurement. If the signal to be measured is a simple 50 or 60 Hz sine wave and the load is resistive, then the measure- ment is simple. But if the signal is more complex, the load is reactive, or the fre- quency is higher, then it is necessary to over-sample both the voltage and the cur- rent in the load to determine the actual power, increasing the demands on convert- ers and processor. An analog multiplier driv- en by the voltage and current in the load has an output proportional to instantaneous power, which may be integrated and sam- pled quite slowly. Even if we are only interested in the root- mean-square (rms) voltage of a complex waveform, analog rms computation works at several gigahertz — 100 times faster than an over-sampled digital system. And, of course, the dynamic range of the highest resolution ADC is 20 or 30 dB less than that of an analog logarithmic amplifier. So there are still a number of areas where ana- log signal processing offers substantial cost and performance advantages over digital. To learn more about analog processing, Go to: http://rbi.ims.ca/5696-109 raq@reedbusiness.com Digital processing does not always rule (Or, what makes an analog engineer laugh?) Contributing Writer James Bryant has been a European applications manager with Analog Devices since 1982. He holds a degree in Physics and Philosophy from the University of Leeds. He is also a C.Eng., Eur.Eng., MIEE, and an FBIS. In addition to his passion for engi- neering, James is a radio ham and holds the call sign G4CLF. Q.Why recommend analog signal processing when digital systems are so cheap and powerful? DNX060424RAQ.qxd 4/6/2006 2:00 PM Page 25 |
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| Following Datasheets | RAQ_analogICs_1 (1 pages) RAQ_Ancient_Logic (1 pages) RAQ_attenuator_1 (1 pages) RAQ_balancing_Phase (1 pages) RAQ_biasCurrent (1 pages) RAQ_Burning_Cakes (1 pages) RAQ_capaciticectomy (1 pages) RAQ_capacitors_1 (1 pages) RAQ_caveat (1 pages) RAQ_chips_1 (1 pages) |
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