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Damian Anzaldo
Damian Anzaldo
6/25/2013 9:16:40 PM
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Re: More analog integration in the RF signal path
Sure...I'll move this up in my priority list

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Brad Albing
Brad Albing
6/24/2013 4:53:23 PM
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Re: More analog integration in the RF signal path
@Damian - perhaps you can blog sometime about AAS and AAA? Active antennas should be of interest to readers here.

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DaeJ
DaeJ
6/13/2013 9:18:07 PM
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Re: Synthesizing cable TV & cell phone bands, etc.
Every year, IEEE RFIC Symposium is held and also, there are active for Wireless technology in the global market. Through this conference, they discuss the various architectures of wireless infrastructure. RF Engineer evaluates Over-The-Air Performance of RF device to show the variants between good and bad wireless device.  So, I think that all accessories related to wireless tech have a bright future.

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DaeJ
DaeJ
6/13/2013 8:58:58 PM
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Re: RF devices
Qualcomm is a supplier of CDMA chipsets and RF chipset.  When they build library function inside chip, I am wondering if they are using the same spec with that of carrier provider.  Still they need to standard all requirements between chip maker and carrier.

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Netcrawl
Netcrawl
6/13/2013 8:42:02 PM
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Re: Synthesizing cable TV & cell phone bands, etc.
DAC is getting more attention these days, outpacing all other data converter product categories. Research firm Databeans has already forecasts the data coverter market to grow double between 2011 and 2015, the firm expect the DAC market to grow more than 60 percent. So what exactly driving this growth? it look like DAC is on fire, unstoppable. 

 

 

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Damian Anzaldo
Damian Anzaldo
6/13/2013 10:25:11 AM
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Re: Synthesizing cable TV & cell phone bands, etc.
@Brad

The RF-DAC creates a strange paradigm in the analog integration roadmap because it actually enables more digital integration by shifting some of the analog RF functions, like the analog quadrature modulator, into the digital domain. This changes the type of analog integration from a traditional approach of "integrate more building blocks" to what I call "radical architecture divergence" or RAD for short. Because of this I believe the RF-DAC is a form of analog integration. I'll write a new blog to cover this topic and answer your questions in more detail

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Damian Anzaldo
Damian Anzaldo
6/13/2013 10:23:39 AM
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Re: More analog integration in the RF signal path
@eafpres

For mobile and portable products aside from multi-band tuning, antenna advancements are also very important for MIMO-based radios like LTE, HSPA+ and 802.11n/ac. For example to take full advantage of 2x2 or 4x4 MIMO as specified in LTE-Advanced, it would be great to support 4 miniature antennas in the mobile device. I agree the RFIC advancements are beyond the antenna state of art, but I'm confident antenna design will catch up with IC trends.

In base stations there are active antennas systems (AAS) and active antenna arrays (AAA) that approach the enablers you describe. Another hurdle to overcome is wideband and multi-band RF power amplifiers that are power efficient with high spectral purity. This will help with carrier aggregation in LTE base stations.

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eafpres1
eafpres1
6/12/2013 11:14:27 PM
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More analog integration in the RF signal path
Hi Damian.  Thanks for the examples.  On the other side of SDR (software defined radio) there remains the challenge of antennas.  In handsets, some work has been done in controllable antennas that use various techniques such as active matching, PIN diode switching, MEMS switching, etc. to retune the antenna for different bands. These solutions help but it seems the Analog RFIC state of the art is beyond the antenna state of the art.  In mobile devices that may not be a show stopper, but it would be a large enabler if there were controllable high-gain antennas in sync with the RFIC you describe.  Such an accomplishment would mean a fully software-defined base station would be achievable.

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Brad Albing
Brad Albing
6/12/2013 10:13:59 PM
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Synthesizing cable TV & cell phone bands, etc.
Damian - regarding your mention of the RF:  Here a single, ultra-high-speed, high-dynamic-performance DAC, a.k.a. RF-DAC, is able to synthesize the entire 1GHz downstream cable TV band. Or it can synthesize directly from bits to RF a multi-standard, multi-carrier cellular band from 700MHz to 2.6GHz. I've always found this quite interesting and I'm guessing other readers do too. Can you expand upon that portion of your blog with any more details? How much of these circuit blocks that your referring too can actually be integrated onto one IC?

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analoging
analoging
6/12/2013 7:03:34 PM
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RF devices
Many analog IC companies are ramping up their RF device product portfolio including Freescale, International Rectifier, TI and TriQuint. More companies are evaluating GaN for both high-power and high-frequency devices. Even aerospace contractors such as Northrup Grumman are developing new RF chips for military applications. More companies are transitioning from GaAs to GaN such as RFMD.

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