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本帖最後由 heavy91 於 2010-7-1 02:11 PM 編輯 # ~, c6 z: J; ?$ X0 n' Q$ t3 `
( M' [) w3 |+ {8 y( {8 n! V/ f' W; GRelation of jitter type material~~
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Jitter can be defined as the deviations in a clock’s output transition2 x z8 ~) C) l0 t+ e7 P7 R
from their ideal positions. The deviation can either be leading or: Y" {" A9 z8 W' Y, x
lagging the ideal position. Jitter is usually specified in ± pico seconds./ v6 m+ O9 G' ^2 ]
Jitter measurements can be classified into three categories:
3 }5 S- U' h2 ?$ J7 y" kcycle-to-cycle jitter, period jitter, and long-term jitter. All jitter measurements6 K3 a. [; ^( s9 \4 x3 U5 f' A
are at a specified voltage, usually Vcc/2 or 1.5V.$ x( n. ] ?' Q v3 Z
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