US PATENT SUBCLASS 330 / 252
.~ Including differential amplifier

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

250  DF  WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21}
252.~ Including differential amplifier {9}
253  DF  .~.~> Having field effect transistor
254  DF  .~.~> Having gain control means
255  DF  .~.~> Having push-pull amplifier stage
256  DF  .~.~> Having temperature compensation means
257  DF  .~.~> Having current mirror amplifier
258  DF  .~.~> Having common mode rejection circuit
259  DF  .~.~> Having D.C. feedback bias control for stabilization
260  DF  .~.~> Having signal feedback means
261  DF  .~.~> Having particular biasing arrangement

DEFINITION

Classification: 330/252

Including differential amplifier:

(under subclass 250) Subject matter including an amplifier having two similar input circuits so connected that they respond to the difference between two voltages or currents, but effectively suppress like voltages or currents.

SEE OR SEARCH THIS CLASS, SUBCLASS:

69, for tube-type amplifiers functioning in a differential mode.