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

From: Ulf Soderberg
Subject: Re: [Discuss-gnuradio] 2.5 GS/sec 14-bit A/D converter
Date: Thu, 28 Apr 2005 07:42:07 +0200
User-agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)

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.



Eric Blossom wrote:

The punchline is towards the end of this article:


 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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