|
Technical
Glossary - T
| A
| B | C
| D | E
| F | G
| H | I
| J,K | L
| M | N
| O | P
| Q | R
| S | T | U,V
| W,X,Y,Z | Spec.
Char., Number |
TDMA
Time division multiple access. A transmission
in which a frequency band is split into a number
of time slots so that several callers can share
a single channel without interfering with each
other. The term TDMA is commonly used to denote
the IS -136 air interface standard, formerly known
as D-AMPS.
Temperature
Coefficient
The rate at which a parameter varies versus change
in temperature.
tera
A prefix indicating 1012, a trillion, abbreviated
"T."
Terahertz
A frequency of, or a frequency in the range of
a trillion hertz. Abbreviated THz.
Terapin
A trillion pins.
Termination
A one port component that terminates a transmission
line.
Thermal
Resistance
The property of a material, device or system that
impedes the flow of heat. The symbol for thermal
impedance is Qxy , where x is the physical point
from which heat flows and y is the physical point
to which heat flows. Thermal impedance is defined
as the temperature difference between two specified
points or regions divided by the power dissipation
under conditions of thermal equilibrium.
Thick
Film
A film of material that was silk-screened onto
a substrate.
Thin
Film
A film of material, ranging in thickness from
a few hundred to a few thousand Angstroms, which
is deposited by evaporation onto a substrate.
Transformer
A component that transfers electric energy by
magnetic induction from one circuit to another,
usually with a change in voltage or current.
Transistor
A three (or more) terminal active semiconductor
device that allows control of the flow of current
between two of the terminals by applying a small
control, signal to the third terminal. Transistors
can be used as amplifiers, switches or attenuators.
They are most often fabricated from Si or GaAs.
Transition
Time
The time required for a varactor or step recovery
diode to change from the conducting to non-conducting
state after reverse bias is applied, excluding
the time required for charge to be conducted from
the junction. It is normally measured from the
90 percent to 10 percent reverse current states.
Transition time is also called "snap time."
Transmission
Line
A structure that guides electromagnetic energy.
TSS
(See "tangential signal sensitivity")
Tuning
Monotonicity
The degree to which the sign of the slope of the
tuning response versus stimulus curve of a device
does not change.
Tunnel
Diode
A heavily doped p-n diode in which electron tunneling
from the conduction band in the n-type material
to the valence band in the p-type region produces
a region of negative resistance. Tunnel diodes
may be used as oscillators, amplifiers or detectors
(M/A-COM does not manufacture tunnel diodes).
Two-tone,
Third-Order Intermodulation Distortion
The intermodulation distortion products produced
by a component or system when two distinct signals
at frequencies f1 and f2 are incident on the device.
The third order products are defined as 2*f1-f2
and 2*f2 - f1. These products fall very near the
original frequencies and are difficult or impossible
to remove by filtering, so they are most troublesome
to the operation of the system or component.
|
