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Terms in Designer >
Glossary: B
Glossary: B
Backplane
The medium used to interconnect a number of circuit
boards. Typically refers to a special, heavy-duty printed or discrete
wired circuit board.
Ball Grid Array (BGA)
A packaging technology similar to a pad grid array,
in which a device's external connections are arranged as an array of
conducting pads on the base of the package. However, in the case of
a ball grid array, small balls of solder are attached to the conducting
pads.
Bandpass
The frequency limits between half-power points of
a signal or filter.
Bare Die
An unpackaged integrated circuit.
Base
Refers to the number of digits in a numbering system.
For example, the decimal numbering system is said to be base-10. May
also be referred to as the "radix".
Basic Cell
A pre-defined group of unconnected components that
is replicated across the surface of a gate array.
BER
Bit error rate.
BGA (Ball Grid Array)
A packaging technology similar to a pad grid array,
in which a device's external connections are arranged as an array of
conducting pads on the base of the package. However, in the case of
a ball grid array, small balls of solder are attached to the conducting
pads.
BiCMOS
A technology in which the function of each logic gate
is implemented using low-power CMOS, while the output stage is implemented
using high-drive bipolar transistors
Binary Encoding
A form of state assignment for state machines that
requires the minimum number of state variables.
BiNMOS
A relatively new low-voltage integrated circuit technology
in which complex combinations of bipolar and NMOS transistors are used
to form sophisticated output stages providing both high speed and low
static power dissipation.
Bi-quinary
A system which utilizes two bases, base-2 and base-5,
to represent decimal numbers. Each decimal digit is represented by the
sum of two parts, one of which has the value of decimal zero or five,
and the other the values of zero through four. The abacus is one practical
example of the use of a bi-quinary system.
Bit
Abbreviation of binary digit.
BJT (Bipolar Junction Transistor)
A family of transistors.
Blackbox
Same as N-Port.
Blind ViA
A via that is only visible from one side of the substrate.
Bobble
A small circle used on the inputs to a logic gate
symbol to indicate an active-low input or control, or on the outputs
to indicate a negation (inversion) or a complementary signal. Some engineers
prefer to use the term bubble.
Bounce Pad
A special pattern etched onto the power or ground
plane of a microwire circuit board to be used in conjunction with a
laser beam which is employed to create blind vias. The laser beam evaporates
the epoxy forming the outer layers of the board and continues down to
the bounce pad which reflects, or bounces, it back up, thereby terminating
the via.
Braze
To unite or fuse two pieces of metal by heating, or
with a hard solder with a high melting point.
Bulk Storage
Refers to some form of media, typically magnetic,
such as tape or a disk drive which can be used to store large quantities
of information relatively inexpensively.
Buried Via
A via used to link conducting layers internal to a
substrate. Such a via is not visible from either side of the substrate.
Bundle
A set of signals related in some way that makes it
appropriate to group them together for ease of representation or manipulation.
May contain both scalar and vector elements; for example, {a,b,c,d[5:0]}.
Bus
A set of signals performing a common function and
carrying similar data. Typically represented using vector notation;
for example, address[7:0].
Byte
A group of eight binary digits, or bits.
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