AI-3
REGENERATIVE FEEDBACK—Feedback in which the feedback signal is in phase with the input
signal. Also called POSITIVE FEEDBACK
RF (RADIO FREQUENCY) AMPLIFIER—An amplifier designed to amplify signals with frequencies
between 10 kilohertz (10 kHz) and 100,000 megahertz (100,000 MHz).
RF (RADIO FREQUENCY) TRANSFORMER—A transformer specially designed for use with rf
(radio frequencies). An rf transformer is wound onto a tube of non- magnetic material and has a core
of either powdered iron or air.
SATURATION (MAGNETIC CORE)—The condition in which a magnetic material has reached a
maximum flux density and the permeability has decreased to a value of (approximately) 1.
SATURABLE-CORE REACTOR—A coil whose reactance is controlled by changing the permeability
of the core.
SERIES PEAKING—A technique used to improve high-frequency response in which a peaking coil is
placed in series with the output signal path.
SHUNT PEAKING—A technique used to improve high-frequency response in which a peaking coil is
placed in parallel (shunt) with the output signal path.
SIGNAL—A general term used to describe any a.c. or d.c. of interest in a circuit; e.g., input signal.
STAGE—One of a series of circuits within a single device; e.g., first stage of amplification.
SWAMPING RESISTOR—A resistor used to increase or "broaden" the bandwidth of a circuit.
TUNED CIRCUIT—An LC circuit used as frequency-determining network.
VIDEO AMPLIFIER—An amplifier designed to amplify the entire band of frequencies from 10 hertz
(10 Hz) to six megahertz (6 MHz). Also called a WIDE-BAND AMPLIFIER.
VIRTUAL GROUND—A point in a circuit which is at ground potential (0 V) but is not connected to
ground.
VOLTAGE AMPLIFIER—An amplifier in which the output-signal voltage is greater than the input-
signal voltage.
WIDE-BAND AMPLIFIER—An amplifier designed to pass an extremely wide band of frequencies,
i.e., video amplifier.
