Page 24 - Electrical Engineering Dictionary

µ 0 common symbol for permeability of
free space constant. µ 0 = 1.257 × 10 −16
henrys/meter.
Special common symbol for relative perme-

µ r
ability.
Symbols ω common symbol for radian frequency

in radians/second. ω = 2 · π · frequency.

common symbol for positive transition
θ +
α-level set a crisp set of elements belong- angle in degrees.
ing to a fuzzy set A at least to a degree α
common symbol for negative transi-
θ −
tion angle in degrees.
A α ={x ∈ X | µ A (x) ≥ α}
See also crisp set, fuzzy set. θ cond common symbol for conduction an-
gle in degrees.
1f common symbol for bandwidth, in
hertz. θ sat common symbol for saturation angle
in degrees.
common symbol for gallium ar-
rGaAs
θ CC common symbol for FET channel-
senide relative dielectric constant. rGaAs =
◦
to-case thermal resistance in C/watt.
12.8.
θ JC common symbol for bipolar junction-
rSi common symbol for silicon relative
to-case thermal resistance in C/watt.
◦
dielectric constant. rSi = 11.8.
A ∗ common symbol for Richardson’s
0 symbol for permitivity of free space. constant. A = 8.7 amperes · cm/ K
◦
∗
0 = 8.849 × 10 −12 farad/meter.
BV GD See gate-to-drain breakdown
r common symbol for relative dielectric voltage.
constant.
BV GS See gate-to-source breakdown
η DC common symbol for DC to RF con- voltage.
version efficiency. Expressed as a percent-
age.
dv/dt rate of change of voltage with-
stand capability without spurious turn-on of
common symbol for power added ef-
η a the device.
ficiency. Expressed as a percentage.
H ci See intrinsic coercive force.
η t common symbol for total or true effi-
ciency. Expressed as a percentage. n e common symbol for excess noise in
watts.
0 opt common symbol for source reflec-
tion coefficient for optimum noise perfor- n s h common symbol for shot noise in
mance. watts.

c
2000 by CRC Press LLC