18WuD2x

G 1. Symbol for CONDUCTANCE. 2. Abbreviation
of GIGA-. 3. Symbol for DEFLECTION FACTOR.
4. Symbol for PERVEANCE. 5. Symbol for GRAV-
ITATIONAL CONSTANT. 6. Symbol for GENERA-
TOR. 7. Symbol for GATE. 8. Abbreviation for
GAUSS.
g 1. Symbol for CONDUCTANCE. 2. Abbreviation
of GRAM. 3. Subscript for GATE. 4. Subscript for
GENERATOR. 5. Symbol for GRAVITY.
GA Radiotelegraph abbreviation of “Go ahead.”
G/A Abbreviation of ground-to-air.
Ga Symbol for GALLIUM.
GaAs 1. Formula for gallium arsenide. 2. Pertaining
to semiconductor devices based on gallium
arsenide.
GA coil A special form of coil, wound with extra
space among the turns to reduce the distributed
capacitance.
gadget 1. A device or component. 2. A superfluous
or makeshift device.
gadolinium Symbol, Gd. A metallic element of the
rare-earth group. Atomic number, 64. Atomic
weight, 157.25.
gage See GAUGE.
gain The extent to which a component, circuit, device,
or system increases current, voltage, or
power. Applicable especially to active devices,
such as transistors and integrated circuits (ICs),
and to amplifiers and filters that use them. Also
used to express the directional properties of some
antenna systems. Usually specified in decibels
(dB). See AMPLIFICATION, CURRENT AMPLIFI-
CATION, DECIBEL, VOLTAGE AMPLIFICATION,
and POWER AMPLIFICATION.
gain bandwidth product Symbol, f T . The frequency
at which the gain of a bipolar transistor is
equal to 1 (no amplification or loss) in the
common-emitter configuration. The f T represents
an absolute upper limit for the frequency at
which a bipolar transistor will works as an
amplifier. Any attempt to design an amplifier
using a bipolar transistor at a frequency higher
than its f T will inevitably fail. Compare ALPHA
CUTOFF FREQUENCY.
gain control 1. To adjust the gain of an amplifier.
2. A potentiometer used to adjust amplifier gain.
Input
+
gain control
+
Gain
adjustment
Output
gain function A function between two currents or
voltages in a circuit with gain.
gain-level linearity The quantitative measure of
the extent to which the gain of a device depends
on the signal level. The level is found by compar-
Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use