US PATENT SUBCLASS 330 / 291
.~ Including signal feedback means

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

250  DF  WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21}
291.~ Including signal feedback means {3}
292  DF  .~.~> Having compensation for interelectrode impedance
293  DF  .~.~> Having negative feedback
294  DF  .~.~> Having frequency-responsive means or phase-shift means in feedback path

DEFINITION

Classification: 330/291

Including signal feedback means:

(under subclass 250) Subject matter wherein a portion of the electrical signal output energy is applied to the input of the amplifier.

(1) Note. There is a shared impedance for the input and output circuits involved.

(2) Note. The amplifier of this subclass may be any stage or group of stages of a cascaded amplifier.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9, for amplifiers with periodic switching input-output comparison including those with feedback circuits.

75+, appropriate subclasses for vacuum tube signal feedback amplifiers.

260, for signal feedback in differential amplifiers.

265, for feedback in complementary push-pull amplifiers. 271, for signal feedback in push-pull amplifiers.

282, for signal feedback in gain control circuits.