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Hardware needs limit software radio

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amulcock
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re: Hardware needs limit software radio
amulcock   3/19/2008 8:26:56 AM
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PA is a single chip, as are DAC's, when do yo think they will they become integrated into a single package ? Add a power supply tracking algorithum into the PA part, using the digital part to define what power supply the PA needs and that will minimise a lot of the Alaog parts. This is what happened to VHF radios a good 20 years ago, the first IC's had lots of off chip coils and filters, and over time the off chip parts have been done away with. Look inside your TV, you'll find little alog stuff. Over the years, the digits move up the frequency band, the software moves up the frequency band, and the Alog gets squeezed. Only 30 years ago, designing at 2 GHz alog was a major design challenge, now Jo and his friend can and do make WiFi kit that works fine. Even 20 years ago, designing digital at 100 MHz was a challenge, 10 MHz was normal, now we hit GHz plus on a regular basis.

nodaksiouxfan
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re: Hardware needs limit software radio
nodaksiouxfan   3/11/2008 1:59:42 PM
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What a defeatist attitude! All this ragging on the fact that a SDR requires HW??? Of course it does, it's still a radio. Sure, the "ideal" SDR has an ADC and DAC directly at the antenna, but that is a theoretical ideality. One could write a similar article stating the reasons why an "ideal" amplifier (distortions and noise) or even an "ideal" resistor (tolerances, aging, thermal noise) can't be made, and those in the know would scoff at such an article. And merely naming an ADC like the TI ADS8401 as the "fastest" available for use in a wideband military radio is laughable. I'm sure that the author is an intelligent one and no offense is intended, but I think he was wearing his "anti-marketing" hat instead of his engineering hat when writing this article.

frankmlinar
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re: Hardware needs limit software radio
frankmlinar   3/11/2008 11:43:19 AM
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I've only read the first paragraph, and I immediately screamed, "No!" "...simply by changing its software" --- who is making this statement? a Marketer? An engineer would never do so. Third paragraph. "...big, heavy, power hungry..." You must be talking about military radios. I submit that you can build a "software radio" in the form factor of a cell phone simply by understanding what you are talking about. Now I'll read the rest of the article.

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