US PATENT SUBCLASS 330 / 118
INCLUDING A PUSH-PULL STAGE

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

118INCLUDING A PUSH-PULL STAGE {4}
119  DF  .~> Coupling to or from cathode in push-pull
120  DF  .~> Interstage coupling between push-pull {1}
122  DF  .~> Input and/or output coupling for push-pull
123  DF  .~> Power or bias supply circuits and control thereof

DEFINITION

Classification: 330/118

(under the class definition) Subject matter including two amplifiers as defined in the class definition, the input electrodes of each of the amplifying devices of the two amplifiers being balanced to ground or some other convenient electrical reference plane, the source of electrical signal being such, and so coupled to the input electrodes, that at any instant the signal on each input electrode is substantially equal and opposite in sign to the signal on the other input electrode; and wherein the signal on the output electrodes of each of the amplifying devices is similarly balanced to a convenient electrical reference plane.

(1) Note. A balanced signal circuit is treated as a special case of a single source or a single load, in this class.

(2) Note. A push-pull amplifier is treated as a single channel with a single source and a single load in this class.

SEE OR SEARCH THIS CLASS, SUBCLASS:

55, for push-pull amplifiers including a push-pull stage.

69, for sum and difference amplifiers similar in structure to push-pull amplifiers. 71+, particularly subclass 72, for push-pull amplifiers included in series energized vacuum tube arrangements.

77, for push-pull amplifiers having feedback compensation to mitigate inter-electrode impedance effects.

81+, for amplifiers having at least one push-pull stage having signal feedback.

116, for amplifiers with balanced-to-unbalanced coupling.

117, for amplifiers with unbalanced-to-balanced coupling including phase splitters.

262+, for semiconductor amplifiers including a push-pull stage.

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

595, for miscellaneous circuits including push pull circuits.

333, Wave Transmission Lines and Networks,

4+, and 25+ for passive balanced networks. See the search notes under subclasses 4 and 25.