“Book/Definitions”
Electrical Engineering Dictionary.
Ed. Phillip A. Laplante
Boca Raton: CRC Press LLC, 2000
Special
Symbols
α-level set
a crisp set of elements belong-
ing to a fuzzy set A at least to a degree α
Aα = {x ∈ X | µA(x) ≥ α}
See also crisp set, fuzzy set.
1f
common symbol for bandwidth, in
hertz.
εrGaAs
common symbol for gallium ar-
senide relative dielectric constant. εrGaAs =
12.8.
εrSi
common symbol for silicon relative
dielectric constant. εrSi = 11.8.
ε0
symbol for permitivity of free space.
ε0 = 8.849 × 10−12 farad/meter.
εr
common symbol for relative dielectric
constant.
ηDC
common symbol for DC to RF con-
version efficiency. Expressed as a percent-
age.
ηa
common symbol for power added ef-
ficiency. Expressed as a percentage.
ηt
common symbol for total or true effi-
ciency. Expressed as a percentage.
0opt
common symbol for source reflec-
tion coefficient for optimum noise perfor-
mance.
µ0
common symbol for permeability of
free space constant. µ0 = 1.257 × 10−16
henrys/meter.
µr
common symbol for relative perme-
ability.
ω
common symbol for radian frequency
in radians/second. ω = 2 · π · frequency.
θ+
common symbol for positive transition
angle in degrees.
θ−
common symbol for negative transi-
tion angle in degrees.
θcond
common symbol for conduction an-
gle in degrees.
θsat
common symbol for saturation angle
in degrees.
θCC
common symbol for FET channel-
to-case thermal resistance in ◦C/watt.
θJC
common symbol for bipolar junction-
to-case thermal resistance in ◦C/watt.
A∗
common symbol for Richardson’s
constant. A∗ = 8.7 amperes · cm/◦K
BVGD
See gate-to-drain breakdown
voltage.
BVGS
See gate-to-source breakdown
voltage.
dv/dt
rate of change of voltage with-
stand capability without spurious turn-on of
the device.
Hci
See intrinsic coercive force.
ne
common symbol for excess noise in
watts.
nsh
common symbol for shot noise in
watts.
c©2000 by CRC Press LLC
nt
common symbol for thermal noise in
watts.
10base2
a type of coaxial cable used to
connect nodes on an Ethernet network. The
10 refers