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Glossary: G
Glossary: G
Gain
The ratio of the power output to the power input of
the amplifier in dB. The gain is specified in the linear operating range
of the amplifier where a 1 dB increase in input power gives rise to
a 1 dB increase in output power. Gain = 20*log(S21)
Gate Array
An application-specific integrated circuit in which
the manufacturer pre-fabricates devices containing arrays of unconnected
components organized in groups called basic cells. The designer specifies
the function of the device in terms of cells from the cell library and
the connections between them, and the manufacturer then generates the
masks used to create the metallization layers.
Glue Logic
Simple logic gates used to interface more complex
functions together.
Gold Flash
An extremely thin layer of gold with a thickness measured
on the molecular level which is either electroplated or chemically plated
onto a surface.
Gray Code
A sequence of binary values in which each pair of
adjacent values differs by only a single bit; for example, 00, 01, 11,
10.
Green Ceramic
Unfired, malleable ceramic.
Ground Bounce
Momentary noise on the device ground plane causing
a 0 signal to erroneously be seen as a 1. Ground bounce is caused by
simultaneously switching outputs (SSO).
Ground Plane
A conducting layer in, or on, a substrate providing
a grounding, or reference, point for components. There may be several
ground planes separated by insulating layers.
Guard Condition
A Boolean expression associated with a state transition
in a state diagram or state table. The expression must be satisfied
for that state transition to be executed.
Guided Probe
A form of functional test in which the operator is
guided in the probing of a circuit to isolate a faulty component or
track.
Guided-Wave
A form of optical interconnect, in which optical waveguides
are fabricated directly on the substrate of a multichip module. These
waveguides can be created using variations on standard opto-lithographic
thin-film processes.
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