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"D",
"E",
"F",
"G",
"H",
"I",
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"L",
"M",
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"P",
"Q",
"R",
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"U",
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"X",
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Previous set of "F" terms.
FLIP CHIP. A monolithic IC packaging technique that eliminates the need for bonding wires.
FLIP-FLOP. A device having two stable states and two input terminals (or types of input signals), each of
which corresponds with one of the two states. The circuit remains in either state until caused to change
to the other state by application of a voltage pulse. A similar bistable device with an input that allows it
to act as a single-stage binary counter. Also refer to Multivibrator.
FLOATING INPUT. An input pin that is not tied to a supply rail and could float to an invalid logic level. An input pin that does not have an internal pull-up or pull-down and requires an external pull-up resistor which is not present. An input pin with no defined logic level and will float to any voltage, however most pins slowly drift high.
FLOPPY. The Floppy disk drive stored data on a small, circular piece of metal-coated plastic. A Floppy disk drive could read and write data to/from the disk and it's controller. The transfer speed of a FDD is relatively slow, and the data storage capacity vary low. Data transfer speeds for Floppy Disk Drives [FDD] normally are 250KBps for the 720KB disk size and 500KBps for the 1.44MB disk size. Two common size devices are produced for the 3.5 inch floppy drive; the standard version 25.4 x 101.6 x 146mm [H x W x D], and a reduced size version 12.7 x 96 x 126mm [H x W x D]. FDD devices are obsolete and were replaced in 2005 by USB flash drives. [FDD Manufacturers]
FLUX. In electrical or electromagnetic devices, a general term used to designate collectively all the
electric or magnetic lines of force in a region. A solution that removes surface oxides from
metals being soldered.
FLUX DENSITY. The number of magnetic lines of force passing through a given area.
FLY-BY-OPTIC. An avionics bus that uses fiber-optic interfaces and fiber cable to replace copper wire. See Fly-By-Wire.
| FLY-BY-WIRE. A term used in the aerospace industry that denotes a control system that replaces traditional mechanical or hydraulic linkages with electronic connections between control units that drive electro-mechanical actuators. Also refer to; Avionic Bus Descriptions. |
 F-22 Flight Displays |
FLYWHEEL EFFECT. The ability of a resonant circuit to operate continuously because of stored energy or energy pulses.
FM Receiver. A receiver that decodes a Frequency Modulated signal to recover encoded information.
FM Receiver Block Diagram
FOCUSING ANODE. An electrode of a CRT that is used to focus the electrons into a tight beam.
FOLDED DIPOLE. An ordinary half-wave antenna (dipole) that has one or more additional conductors connected across the ends parallel to each other. Antenna Dictionary
FORBIDDEN BAND. The energy band in an atom lying between the conduction band and the valence band. Electrons are never found in the forbidden band but may travel back and forth through it. The forbidden band determines whether a solid material will act as a conductor, a semi-conductor, or an insulator.
FORWARD AGC. The type of AGC that causes an amplifier to be driven towards saturation. Also see the Radar section for AGC.
FORWARD BIAS. An external voltage that is applied to a PN junction in the conducting direction so that the junction offers only minimum resistance to the flow of current. Conduction is accomplished by majority current carriers (holes in P-type material; electrons in N-type material).
FORWARD RESISTANCE. The smaller resistance value observed when you are checking the resistance of a semiconductor.
FOSTER-SEELEY DISCRIMINATOR. A circuit that uses a double-tuned RF transformer to convert frequency variations in the received FM signal to amplitude variations. Also known as a phase-shift discriminator.
Next page of "F" Terms and definitions
