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Technical
Glossary - H
| A
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| D | E
| F | G
| H | I | J,K
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| R | S
| T | U,V
| W,X,Y,Z | Spec.
Char., Number |
h
Parameters
The set of parameters for a two port device that
relates the input voltage and current to the output
current and voltage.
Harmonic
Content
The degree of distortion in a signal due to the
presence of harmonics.
Harmonic
(See "harmonics")
Harmonics
Energy at integral multiples of the frequency
of the fundamental signal. Normally expressed
as THD (Total Harmonic Distortion) but can be
specified for harmonics of interest in either
a percentage of or decibels below the power level
of the fundamental frequency signal.
Heat
Sink
A structure that is mechanically attached to a
device that generates heat, in order to lower
the overall thermal impedance between the point
source of the heat within the device and its cooler
surroundings.
hecto
A prefix that indicates a factor 102, abbreviated
as "h".
Hermetic
Permanently sealed to the extent that transmission
of gases and liquids is reduced or eliminated.
Hermeticity
The extent to which a seal is hermetic.
Hertz
The unit of frequency, formerly known as "cycles
per second," abbreviated as "Hz."
Hertz,
Heinrich, 1857-1894
German physicist best known for demonstrating
the propagation of radio waves through free space
as predicted my Maxwell's equations.
Heterolithic
Microwave Integrated Circuit
A microwave integrated circuit that consists of
silicon and glass, typically known as an "HMIC"."
This technology was invented and patented by M/A-COM.
An HMIC consists of pedestals of Si embedded in
glass. The Si pedestals may act as conductive
vias from the top of the die to the bottom of
the die, or there may be diodes formed at the
tops of the pedestals. Conductor can be deposited
on top of the glass to form transmission lines
or lumped elements, such as spiral inductors,
baluns or MIM capacitors.
High
Pass Filter
A reactive circuit that rejects signals whose
frequencies are below the 3 dB point frequency
and passes signals whose frequencies are above
the 3 dB point frequency.
Hi-Rel
Screening
Regimen of testing intended to induce latent infant
mortality failures in a semiconductor lot in order
to insure that the surviving devices will operate
as predicted by mean-time-before-failure for the
device type.
HMIC
(see "Heterolithic Microwave Integrated Circuit"")
Hole
The term used to describe the conceptual positive
charge carrier. A hole is actually a vacancy in
the valance band of an otherwise electrically
neutral atom, thereby resulting in a positive
ion. The charge of a single hole is (+)1.6 * 10-19
coulombs.
HPF
(See "high pass filter")
Hz
(See "Hertz")
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