(under subclass 310) Subject matter wherein at least one of the cascaded stages is of a different configuration from at least one of the other cascaded stages.
(1) Note. In a semiconductor amplifier having emitter, base, and collector electrodes, input signal current flows through two electrodes thereof, and output signal current flows through two electrodes thereof, one of the electrodes being common to both input and output circuits. Therefore, in the three electrode semiconductor amplifier, there is a common electrode, an input electrode and an output electrode. By the configuration of a semi-conductor amplifier is meant the arrangement of base, emitter, and collector electrodes thereof, as the input, common, and output electrodes thereof. The configuration is usually referred to as common base, common emitter, or common collector configuration, but this does not completely define the configuration which must have at least one of the other semiconductor electrodes identified by its function as input or output electrode.
SEE OR SEARCH THIS CLASS, SUBCLASS:
153, for cascaded vacuum tube amplifier devices with differently coupled interstage circuits including at least one cathode follower stage.
157+, appropriate subclasses thereunder, for interstage coupling to or from electrodes and as cathode, or from electrodes such as cathode or screen grid not used in the
majority of vacuum tube amplifiers as input or output electrode.
168, for vacuum tube interstage transformer coupling from the cathode.
