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Noise Reduction Using Low Weight and Constant Weight Coding Techniques

Author(s)
Tabor, Jeff F.
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Abstract
Signalling off-chip requires significant current. As a result, a chip's power-supply current changes drastically during certain output-bus transitions. These current fluctuations cause a voltage drop between the chip and circuit board due to the parasitic inductance of the power-supply package leads. Digital designers often go to great lengths to reduce this "transmitted" noise. Cray, for instance, carefully balances output signals using a technique called differential signalling to guarantee a chip has constant output current. Transmitted-noise reduction costs Cray a factor of two in output pins and wires. Coding achieves similar results at smaller costs.
Date issued
1990-05-01
URI
http://hdl.handle.net/1721.1/7029
Other identifiers
AITR-1232
Series/Report no.
AITR-1232

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  • AI Technical Reports (1964 - 2004)

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