18WuD2x

504 out-of-phase current • output coupling transformer
out of phase
out-of-phase current Reactive current in an alternating-current
circuit (i.e., current that is out of
phase with voltage. Also see QUADRATURE CUR-
RENT).
out-of-phase voltage Voltage across a reactance; so
called because it is out of phase with the current.
outphaser A device that converts a sawtooth wave
to a square wave. It is used in electronic organs
and synthesizers.
outphasing modulation A system of modulation
in which the sideband frequencies are shifted
90 degrees from the phase position in an amplitude-modulated
wave. The resulting constantenvelope
wave is then amplified with high
efficiency and low distortion by a class-C stage;
then the signal is reconverted to an amplitudemodulated
one by phase shifting the carrier, with
respect to the sidebands.
out-plant system A data-processing system in
which a central computer receives data from remote
terminals.
output 1. Energy or information delivered by a
circuit, device, or system. Compare INPUT, 1. 2.
The terminals at which energy or information is
taken from a circuit, device, or system. Compare
INPUT, 2.
output admittance Symbol, Y o . The internal admittance
of a circuit or device, as “seen” at the
output terminals; the reciprocal of OUTPUT
IMPEDANCE. Compare INPUT ADMITTANCE.
output amplifier See FINAL AMPLIFIER.
output area In a computer system, the portion of
storage holding information for delivery to an output
device. Also called output block.
output axis For a gyroscope that has received an
input signal, the axis around which the spinning
wheel precesses.
output block See OUTPUT AREA.
output buffer 1. A circuit that follows an oscillator
and reduces the effects of variable load impedance
on the oscillator frequency or signal amplitude.
2. An amplifier, usually with a voltage gain of 6 dB,
that follows a video multiplexer. The amplifier
drives a coaxial transmission line.
output bus driver In a computer, a device that
amplifies output signals sufficiently to provide
signals to other devices without undue loading of
the supply line (bus).
output capability The maximum power or voltage
output that a circuit can deliver without distortion
or other improper operating conditions.
output capacitance Symbol, C o . The internal capacitance
of a circuit or device, as seen at the
output terminals. Compare INPUT CAPACI-
TANCE.
output capacitive loading For an operational amplifier
at unity gain, the maximum capacitance
that can be connected to the output of the amplifier
before phase shift increases to the point of oscillation.
output capacitor 1. In a capacitance-coupled circuit,
the output coupling capacitor. Compare IN-
PUT CAPACITOR. 2. The last capacitor in a
power-supply filter circuit.
output capacity The maximum output capability
of a device or system expressed in appropriate
units, such as current, voltage, power, torque,
horsepower, etc.
output choke The last choke (inductor) in a
power-supply filter circuit.
Input
L1
C1
L2
output choke
Output choke
C2
Output
output circuit The circuit or subcircuit that constitutes
the output portion of a network or device.
Also see OUTPUT and OUTPUT TERMINALS.
Compare INPUT CIRCUIT.
output-circuit distortion Distortion in the output
portion of a circuit or device (such as a transistor
or transformer), usually caused by an overload or
nonlinear response.
output conductance Symbol, G o . The internal
conductance of a circuit or device, as “seen” at
the output terminals. It is the reciprocal of OUT-
PUT RESISTANCE. Compare INPUT CONDUC-
TANCE.
output control 1. The gain control of an amplifier.
2. The level control of a variable power supply.
output coupling capacitor See OUTPUT CAPACI-
TOR.
output coupling transformer See OUTPUT
TRANSFORMER.