Breaking News
Comments
Newest First | Oldest First | Threaded View
MikiW
User Rank
Rookie
re: National Semiconductor: Software defined radio: Don't talk to me about ENOBS (Part 1 of 2)
MikiW   1/28/2012 4:31:24 PM
NO RATINGS
Hi, Where can I find the second part of the article?

Scott NSC
User Rank
Rookie
re: National Semiconductor: Software defined radio: Don't talk to me about ENOBS (Part 1 of 2)
Scott NSC   9/27/2010 3:10:57 PM
NO RATINGS
Hi Frank, The new 12-bit ADCs use a folding and interpolating architecture and they are manufactured in a CMOS process. Thanks, Scott

old account Frank Eory
User Rank
Rookie
re: National Semiconductor: Software defined radio: Don't talk to me about ENOBS (Part 1 of 2)
old account Frank Eory   9/24/2010 5:38:47 PM
NO RATINGS
Keep in mind SDR is still mostly a military thing -- it has a ways to go before it's cost-effective and low enough power for everyday commercial applications. A product brief on National's website says 4.1 watts @ 1.9V in a 292 pin thermally enhanced BGA package. You're clearly not going to put that in a cell phone, but that's not the target market. Scott, is this a continuous time sigma delta architecture? Can you tell us if it's CMOS, SiGE, or what?

Jaspreet.Singh
User Rank
Rookie
re: National Semiconductor: Software defined radio: Don't talk to me about ENOBS (Part 1 of 2)
Jaspreet.Singh   9/24/2010 12:48:18 AM
NO RATINGS
What is the power consumption and cost of the 12-bit 3.6 Gsps ADC ? I suspect it might still be too high to prohibit its use for commercial applications. What do you folks think about the future trends? As far as my understanding goes, it might be a long time till we have low-cost low-power Gsps ADCs. Good thing nonetheless is that there is growing awareness among academicians as well about the associated signal processing challenges posed by this ADC bottleneck. There have recently been efforts towards exploring design with extremely low-precision ADCs (1-4 buts), and also massively parallel time-interleaved ADCs that can provide higher resolution.

Pazhy
User Rank
Rookie
re: National Semiconductor: Software defined radio: Don't talk to me about ENOBS (Part 1 of 2)
Pazhy   9/23/2010 8:11:05 PM
NO RATINGS
Thanks for the article. A wideband ADC will also pick up wideband noise and interferers. This will reduce the dynamic range of the ADC.

Jayakumar
User Rank
Rookie
re: National Semiconductor: Software defined radio: Don't talk to me about ENOBS (Part 1 of 2)
Jayakumar   9/23/2010 7:41:45 AM
NO RATINGS
Very interesting to read about this article and we will look forward to read part 2. Speed in which ADC samples is very important and the same define how close we are towards true SDR. Do we have FPGA fabric to handle 3.5 GSPS samples and create I and Q channel and perform other operations in it. It is clear that present generation DSPís may not able to do, but if these ADCís fit in PCI or PXI bus of INTEL processors then we might able crank some amount of computations. Still challenge is there the way we do signal processing in Digital Part. May be we need to look at Neural Network based algorithms and innovation to work with high speed data at one side and very low speed decisions at other side of network. I am keen on looking for part 2 of Scott and hope he does touches the above part. (jk@epigon.co.in)

old account Frank Eory
User Rank
Rookie
re: National Semiconductor: Software defined radio: Don't talk to me about ENOBS (Part 1 of 2)
old account Frank Eory   9/20/2010 11:27:38 PM
NO RATINGS
Interesting article Scott, and I look forward to Part 2. It's true that digital radio designers are more interested in specs that are not typically quoted for ADCs. It would eliminate a lot of the guesswork if comms-oriented ADCs quoted perfomance data on parameters like IMD and NPR.



EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Aging Brass: Cow Poop vs. Horse Doo-Doo
Max Maxfield
9 comments
As you may recall, one of the things I want to do with the brass panels I'm using in my Inamorata Prognostication Engine is to make them look really old. Since everything is being mounted ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
11 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
11 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
45 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)