US PATENT SUBCLASS 327 / 561
.~.~ With operational amplifier

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

524  DF  SPECIFIC IDENTIFIABLE DEVICE, CIRCUIT, OR SYSTEM {22}
560  DF  .~ Nonlinear amplifying circuit {2}
561.~.~ With operational amplifier {1}
562  DF  .~.~.~> With field-effect transistor

DEFINITION

Classification: 327/561

With operational amplifier:

(under subclass 560) Subject matter wherein a nonlinear circuit is combined with a stable, high-gain direct coupled amplifier that depends on an external feedback from the output to the input of the circuit to determine its functional characteristics (i.e., an operational amplifier).

(1) Note. An operational amplifier classifiable in this subclass must be combined with a source of signal energy or with a load that constitutes a nonlinear circuit which is not sufficiently comprehensive to be classified with a specific art area.

SEE OR SEARCH CLASS

330, Amplifiers,

75+, for an amplifier with feedback.

381, Electrical Audio Signal Processing Systems and Devices,

111+, for systems which include combinations of amplifier and loud speaker or amplifier and microphone.