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#1
October 26th 06, 06:48 PM
posted to rec.radio.amateur.homebrew
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Am transmitter - vlsi project
Hi,
I need to design an AM transmitter as a vlsi project (it needs to be located on smart dust later on). Does anyone have any good suggestions were to start from? I am familiar with vlsi, but don't really know how to implement such a big idea, into a vlsi simulation and circuit design. Looking on trasmitter's schemes didn't help, 'cause that's all resistors, amplifiers and capacitors. How do I translate it into vlsi design? Be very glad to any guidance... Thanks. |
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#2
October 26th 06, 08:08 PM
posted to rec.radio.amateur.homebrew
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Am transmitter - vlsi project
hananl wrote: Hi, I need to design an AM transmitter as a vlsi project (it needs to be located on smart dust later on). Does anyone have any good suggestions were to start from? I am familiar with vlsi, but don't really know how to implement such a big idea, into a vlsi simulation and circuit design. Looking on trasmitter's schemes didn't help, 'cause that's all resistors, amplifiers and capacitors. How do I translate it into vlsi design? Be very glad to any guidance... Thanks. Why is this so difficult? Just consider what an AM signal is. Please note that Motorola and I'm sure others have made analog AM transmitter chips beginning a long time ago; they are not "VLSI" by any means. If you'd like to do it more digitally, have a look at the offerings from folk like Analog Devices. Look at their line of TxDACs. Inside some of those chips, you'll find everything you need to make an AM transmitter, given a stream of words representing the modulation you want to apply, and then some. Is "VLSI" compatible with "smart dust"? Is the power dissipation of a universal all-digital solution compatible with "smart dust"? You might do well to first list some of the key requirements: output power, size, carrier frequency, modulation bandwidth... Cheers, Tom |
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#3
October 27th 06, 05:41 AM
posted to rec.radio.amateur.homebrew
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Am transmitter - vlsi project
K7ITM wrote:
hananl wrote: Hi, I need to design an AM transmitter as a vlsi project (it needs to be located on smart dust later on). Does anyone have any good suggestions were to start from? I am familiar with vlsi, but don't really know how to implement such a big idea, into a vlsi simulation and circuit design. Looking on trasmitter's schemes didn't help, 'cause that's all resistors, amplifiers and capacitors. How do I translate it into vlsi design? Be very glad to any guidance... Thanks. Why is this so difficult? Just consider what an AM signal is. Please note that Motorola and I'm sure others have made analog AM transmitter chips beginning a long time ago; they are not "VLSI" by any means. If you'd like to do it more digitally, have a look at the offerings from folk like Analog Devices. Look at their line of TxDACs. Inside some of those chips, you'll find everything you need to make an AM transmitter, given a stream of words representing the modulation you want to apply, and then some. Is "VLSI" compatible with "smart dust"? Is the power dissipation of a universal all-digital solution compatible with "smart dust"? You might do well to first list some of the key requirements: output power, size, carrier frequency, modulation bandwidth... Cheers, Tom Apologies for asking... Please explain vlsi and smart dust to a newbie. Thanks for taking the time. John AB8O |
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#4
October 27th 06, 07:00 AM
posted to rec.radio.amateur.homebrew
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Am transmitter - vlsi project
hananl wrote:
Hi, I need to design an AM transmitter as a vlsi project (it needs to be located on smart dust later on). Does anyone have any good suggestions were to start from? I am familiar with vlsi, but don't really know how to implement such a big idea, into a vlsi simulation and circuit design. Looking on trasmitter's schemes didn't help, 'cause that's all resistors, amplifiers and capacitors. How do I translate it into vlsi design? Be very glad to any guidance... Thanks. Please look up "cross posting" on Wikipedia, and note what they have to say about "multiple posting". Then if you feel the need to cross post (which would have been appropriate here), do so. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Posting from Google? See http://cfaj.freeshell.org/google/ "Applied Control Theory for Embedded Systems" came out in April. See details at http://www.wescottdesign.com/actfes/actfes.html |
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#5
October 27th 06, 06:37 PM
posted to rec.radio.amateur.homebrew
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Am transmitter - vlsi project
"jawod" wrote in message ...
Please explain vlsi and smart dust to a newbie. Think "nanites" from Star Trek: The Borg Generation. See: http://en.wikipedia.org/wiki/Smart_dust It's a popular research topic these days, but as far as I'm aware all the commercial applications are still nowhere near the "grain of rice" size that the proponents would like to achieve -- power sources become a real problem at that size, even if you only do need to communicate with the next node that's only, say, 10' away. Oh... VLSI is "very large scale integration." It just indicates an IC that has "[mumble]-many million transistor," where the actual number is subjective. A 32 bit CPU is VLSI, a 74LS00 ain't. ---Joel |
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