| Wafer |
A paper-thin slice cut from a cylindrical
crystal of pure semiconductor.
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| Wafer Probing |
The process of testing individual integrated
circuits while they still form part of a wafer. An automated tester places probes on the
device's pads, applies power to the power pads, injects a series of signals into the input
pads, and monitors the corresponding signals returned from the output pads.
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| Waveguide |
A transparent path bounded by non-transparent,
reflective areas, which is fabricated directly onto the surface of a substrate. Used in
the optical interconnection strategy known as guided-wave.
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| Wave Soldering |
A process used to solder circuit boards
populated with through-hole components. A wave generating mechanism maintains a wave( ) of
hot, liquid solder traveling back and forth across the surface of a tank. The populated
circuit boards are passed over the wave soldering machine on a conveyer belt. The velocity
of the conveyer belt is carefully controlled and synchronized such that the solder wave
brushes across the bottom of the board only once.
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| Wire Bonding |
The process of connecting the pads on an
unpackaged integrated circuit to corresponding pads on a substrate using wires that are
finer than a human hair. Wire bonding may also be used to connect the pads on an
unpackaged integrated circuit, hybrid, or multichip module to the leads of the component
package.
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| Wiring Layer |
A layer carrying wires in a discrete wired
board. See also signal layer.
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| Word |