Page 96 - Electrical Engineering Dictionary

blooming an area of the target that is un- board the physical structure that houses
stable due to insufficient beam current. The multiple chips, and connects them with traces
areanormallyappearsasawhitepuddlewith- (busses).
out definition. Insufficient beam currently
may be the result of low beam control set- board-to-board optical interconnect
ting. optical interconnection in which the source
and the detector are connected to electronic
blow up a relatively sudden and usually elements in two separate boards.
catastrophic increase in beam size generally
caused by some magnetic field error driving BOB See break-out box.
the beam to resonance.
Bode diagram See Bode plot.
Blumlein a water-filled transmission line
that serves as a pulse generator using a wave Bode plot a graphical characteriza-
propagation principle. The line is folded over tion of the system frequency response:
on itself and is capable of voltage doubling the magnitude of the frequency response
across its load due to having initially both |H(jω)|, −∞ <ω < ∞ in decibels, and
6
sides of the load on high potential. the phase angle H(jω), −∞ <ω < ∞,
are plotted. For example, a system described
Blumlein bridge an AC bridge, two arms by the transfer function
of which are two serially connected tightly
Y(s) s + 1
coupled inductive coils. The point of connec- H(s) = =
tion of these coils is usually grounded, and F(s) (s + 2)(s + 3)
the coupling is arranged in such a way that has the Bode plot shown in the following fig-
for the currents simultaneously entering or ure. See also frequency response.
leaving the other ends of the coils the voltage
drop between the ends is close to zero. If one
of the currents is entering and another is leav-
ing, then the voltage drop is essential. This
creates a sensitive current-comparing bridge
having application in capacitance transduc-
ers.

blurring (1) the defocusing effect pro-
duced by the attenuation of high-frequency
components, e.g., obtained by local averag-
ing operators, possibly applied directionally
(motion blurring).
(2) the broadening of image features, rela-
tive to those which would be seen in an ideal Bode plot.
image, so that features partly merge into one
another, thereby reducing resolution. The ef-
fect also applies to 1-D and other types of Bode–Fano criteria a set of rules for
signal. determining an upper limit on the bandwidth
of an arbitrary matching network.
BNC connector “Baby” N connector.
Commonly used coaxial connector with both boiler a steam generator that converts the
male and female versions used below mi- chemical energy stored in the fuel (coal, gas,
crowave frequencies. etc.) to thermal energy by burning. The heat

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2000 by CRC Press LLC