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how to achieve high data transfer rate in analogue

 
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nanako



Joined: 20 Jul 2001
Posts: 119
Post25 Jul 2004 12:02   how to achieve high data transfer rate in analogue
asking for some knowledge question. i'm pretty much a digital fellow and would like to know of how it is possible in analogue to achieve high data transfer rate. an example would be the Serial ATA. the data rate for that is 1.5Gbps (for 10-bit rate). since this is a serial data that means you are outputting a bit every 1.5GHz (approx. 0.6 ns per bit impossible). I believe it is the analogue portion that finally make the thing work and would like to know the theory behind it.
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Nobody



Joined: 04 Oct 2001
Posts: 250
Location: Formosa
Post25 Jul 2004 15:59   how to achieve high data transfer rate in analogue
Look for the paper or patent regard this field . If there are paralell data process concurrently , the internal frequency is not as high as the serial data rate . Only the front-end and few circuit work on the bus clock rate . 1.5GHz combine from 10 bits , that means 150MHz/bit . The core frequency could be far from its io frequency .
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Nobody



Joined: 04 Oct 2001
Posts: 250
Location: Formosa
Post25 Jul 2004 18:01   Re: how to achieve high data transfer rate in analogue
Here is one presentation from stanford univ.

Sorry, but you need login in to view this attachment
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dumbfrog



Joined: 17 Jul 2004
Posts: 191
Helped: 4
Post26 Jul 2004 5:23   Re: how to achieve high data transfer rate in analogue
Serdes
10 to 20 bits TTL/CMOS to Differential Signals
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echo47



Joined: 07 Apr 2002
Posts: 4205
Helped: 565
Post26 Jul 2004 5:55   how to achieve high data transfer rate in analogue
0.6 ns per bit is not impossible - that's how Serial ATA works!
Each low voltage differential signal (one transmit, one receive) is clocked at 1.5 GHz. It's 8/10 encoded, so you get 150 megabytes per second. Maximum cable length is one meter, if I recall correctly.

Here's the spec:
http://www.serialata.org/collateral/index.shtml
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shiowjyh



Joined: 29 May 2003
Posts: 114
Helped: 1
Post26 Jul 2004 6:35   Re: how to achieve high data transfer rate in analogue
Please also refer to the design of RSDS(Reduced Swing Differential Signaling) or LVDS(Low voltage Differential Signaling) as well...

Regards,
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nanako



Joined: 20 Jul 2001
Posts: 119
Post26 Jul 2004 8:42   how to achieve high data transfer rate in analogue
so am i right to say that if the digital circuit is operating at 150MHz (which is very reasonable frequency) and each cycle performing operation on 10-bit and then passed onto the front-end block (analogue) to conevert it to serial data and output at the rate of 1.5Gbps.
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bastos4321



Joined: 01 Jan 1970
Posts: 334
Helped: 24
Post26 Jul 2004 23:53   Re: how to achieve high data transfer rate in analogue
You can look at Information theory and Shannon's Work.

http://cm.bell-labs.com/cm/ms/what/shannonday/work.html

It will explan the relation between bandwidth, SNR and bit rate.

Bastos
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