US PATENT SUBCLASS 330 / 250
WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR)

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

250WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21}
251  DF  .~> Including Class D amplifier
252  DF  .~> Including differential amplifier {9}
262  DF  .~> Including push-pull amplifier {8}
277  DF  .~> Including field effect transistor
278  DF  .~> Including gain control means {4}
286  DF  .~> Including distributed parameter-type coupling {1}
288  DF  .~> Including current mirror amplifier
289  DF  .~> Including temperature compensation means
290  DF  .~> Including D.C. feedback bias control for stabilization
291  DF  .~> Including signal feedback means {3}
295  DF  .~> Including plural amplifier channels
296  DF  .~> Including particular biasing arrangement
297  DF  .~> Including particular power supply circuitry
298  DF  .~> Including protection means
299  DF  .~> Including combined diverse-type semiconductor device {1}
301  DF  .~> Including balanced to unbalanced circuits and vice versa
302  DF  .~> Including frequency-responsive means in the signal transmission path {4}
307  DF  .~> Integrated circuits
308  DF  .~> Including atomic particle or radiant energy impinging on a semiconductor
309  DF  .~> Involving structure of three diverse function electrode type
310  DF  .~> Including plural stages cascaded {1}

DEFINITION

Classification: 330/250

WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR):

(under the class definition) Subject matter in which the amplifying device is a semiconductor.

(1) Note. Semiconductors are those materials which have a specific resistance, for example, of the order of that of germanium, silicon, selenium, etc.. Subject matter including insulators which are in operation reduced to specific resistance values of the aforesaid range, by alpha or electron bombardment, heat or other means so they act in the circuit, broadly, as semiconductors, are classified in this or appropriate indented subclasses.

(2) Note. For specific types of amplifier devices in amplifiers, which may include a semiconductor material, see the pertinent subclass for the particular semiconductor device involved in this class.

(3) Note. For vacuum tube amplifier device, amplifier circuits similar or related to semiconductor amplifier device circuits, see below the appropriate subclass and indented subclasses for such circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for combined plural diverse amplifying-type devices, where one of the amplifying devices is of the semiconductor type.

4, for master-type amplifying devices wherein the master excited substance is a semiconductor.

4.9, for parametric semiconductor amplifiers.

5, for solid element wave propagating amplifying devices wherein the solid element is a semiconductor.

6, for Hall effect-type semiconductor amplifying devices wherein the Hall effect material is a semiconductor.

7, for capacitive amplifying devices, some of which may have semiconductor properties.

9, for amplifier systems with periodic switching input-output comparison of signal which may have a semiconductor amplifying device.

10, for modulator-demodulator amplifier systems which may have semiconductor amplifier devices.

11, for amplifiers having D.C. reinsertion circuits which may include a semiconductor amplifying device.

SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), appropriate subclasses integrated circuit structure with active solid-state devices, especially

115, 123, and 157 through 161 for regenerative type devices with amplification means, and subclasses 446 and 499+ for integrated circuit devices with electrically isolated components.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous nonlinear conductor device (e.g., transistor) circuits. See search notes.

329, Demodulators, appropriate subclasses for demodulators utilizing transistor elements. 361, Electricity: Electrical Systems and Devices, for transistor circuits with electric relays or electromagnetic loads.

438, Semiconductor Device Manufacturing: Process, appropriate subclass for methods of making semiconductor electrical devices.