US PATENT SUBCLASS 318 / 678
.~.~.~ Differential amplifier

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
671  DF  .~ With particular motor control system responsive to the "actuating signal" {10}
677  DF  .~.~ With particular servoamplifier {5}
678.~.~.~ Differential amplifier

DEFINITION

Classification: 318/678

(under subclass 677) Subject matter in which the particular servoamplifier includes a differential amplifier. A differential amplifier consists of two amplifying devices in parallel with a one common path (e.g., common cathode or common emitter), which senses the difference between a signal on the control electrode of the first amplifying device with the signal on the control electrode of the second amplifying device.

SEE OR SEARCH CLASS

330, Amplifiers,

69, for sum and difference amplifiers and subclass 116 for balanced to unbalanced amplifiers. See the notes thereunder.