Page 150 - Electrical Engineering Dictionary

utilized. Also commonly referred to as joint common base amplifier a single transis-
source-channel coding. tor BJT amplifier in which the input signal
is applied to the emitter terminal, the output
is taken from the collector terminal, and the
combo trouble-shooter in combined base terminal is connected to a constant volt-
electric and gas utilities, a practice which is age.
growing in popularity is the use of combo
troubleshooters. The combo troubleshooter common centroid a technique in
is cross trained in both electric and gas ser- the physical design of integrated circuits
vice practices. The cross functionality per- in which two transistors, which must be
mits more efficient deployment of resources. matched, are actually composed of multiple
devices connected in parallel. By appropri-
come-a-long a ratcheted winch or block- ately connecting the multiple devices, the ef-
and-tackle for pulling conductors into place. fective center (“centroid”) of the two transis-
tors can be located at the same point, thus
improving the matching in the presence of
command (1) directives in natural lan-
nonidealities in the integrated circuit fabri-
guage or symbolic notations entered by users
cation process. See also cross-quad.
to select computer programs or functions.
(2) instructions from the central processor
unit (CPU) to controllers and other devices common channel signaling (CCS) a
for execution. technique for routing signaling information
through a packet-switched network.
(3) a CPU command, or a single instruc-
tion, ADD, LOAD, etc.
common collector amplifier a single-
transistor BJT amplifier in which the input
Commision International d’Eclairage
signal is applied to the base terminal, the out-
(CIE) International standards body for
put is taken from the emitter terminal, and the
lighting and color measurement. Known in
collector terminal is connected to a constant
English as the International Commission on
voltage. Also referred to as an emitter fol-
Illumination.
lower, since the voltage gain of this config-
uration is close to unity (the emitter voltage
commit the phase of a transaction in
“follows” the base voltage).
which the new states are written to the global
memory or database. The commit phase
should not be started until it has been veri- common drain amplifier a single tran-
fied that performing the commit will not vi- sistor FET amplifier in which the input signal
olate the system’s consistency requirements. is applied to the gate terminal, the output is
In most designs, the commit phase itself must taken from the source terminal, and the drain
be performed under more strict locking than terminal is connected to a constant voltage.
the remainder of the transaction. Also referred to as a source follower, since
the voltage gain of this configuration is close
tounity(thesourcevoltage“follows”thegate
Comit´ e Consulatif International T´ el´ egra-
voltage).
phique et T´ el´ ephonique (CCITT) Inter-
national Consultative Committee for Teleg-
raphy and Telephony. This institution, based common emitter a basic transistor am-
in Geneva, Switzerland, issues recommenda- plifier stage whose emitter is common to both
tions concerning all fields related to telecom- input and output loops. It amplifies voltage,
munications. current, and hence power.

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2000 by CRC Press LLC