Re: [Discuss-gnuradio] 2.5 GS/sec 14-bit A/D converter

[Ulf Soderberg]

I found the description of the TechnoConcepts patent for the "Direct 
conversion delta-sigma receiver" over at the [US Patent & Trademark 
Office, Patent Full Text and Image Database], 
http://patft.uspto.gov/netahtml/srchnum.htm by entering the patent no 
6,748,025 search box, and got the following description URL.

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1=6,748,025.WKU.&OS=PN/6,748,025&RS=PN/6,748,025

/Ulf

Eric Blossom wrote:

> The punchline is towards the end of this article:
>
> http://rfdesign.com/mag/radio_new_technology_facilitates
>
>  TechnoConcepts' RF to digital converter is the first 5 GHz carrier
>  speed RF to digital converter capable of direct conversion of a 5 GHz
>  RF carrier, eliminating all analog IF circuits. This receiver is based
>  on a very high speed 5 GHz delta-sigma converter that digitizes
>  signals by modulating the analog input (radio signal) into a
>  high-speed 1-bit digital datastream. The datastream is then digitally
>  processed on the same IC to produce a high-resolution multiple bit
>  word stream sent at a slower data rate. This is the first device to
>  completely eliminate the need for conventional radio receiver
>  downconverters and the associated external analog components. This RF
>  to digital converter is a closed-loop system in which the order of the
>  loop and the input bandwidth may be changed to achieve the desired
>  resolution. A narrow bandwidth results in higher resolution than a
>  wide bandwidth.
>
>
>
> Parameter                                     GaAs            SiGe
>
> Maximum clock frequency                       > 5 GHz              > 15 GHz
> SINAD (signal to noise+distortion)            > 70 dB              > 110 dB
> Eff. resolution bits at 2.5 GHz carrier:        14 bits         18 bits
> 10 MHz BW                                       11 bits         14 bits
>
>
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