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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