US PATENT SUBCLASS 330 / 152
CASCADED DIFFERENTLY COUPLED BETWEEN STAGES


Current as of: June, 1999
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330 /   HD   AMPLIFIERS

152CASCADED DIFFERENTLY COUPLED BETWEEN STAGES {2}
153  DF  .~> Including a cathode follower stage
154  DF  .~> Transformer or resonant circuit in interstage coupling (e.g., stagger tuning)


DEFINITION

Classification: 330/152

(under the class definition) Subject matter including at least three stages of amplification (each stage as defined in the class definition) such that, the input signal for each stage, except the first, is the output signal of the preceding stage; and where two of the interstage coupling means between successive amplifying devices have different characteristics.

(1) Note. The following are examples of subject matter classified in this and indented subclasses: one device is coupled from the plate and the other from the cathode; or one coupling has a tuned circuit and the other has not; or both couplings have circuits tuned to different frequencies or the two couplings may be similar but contain an impedance element or elements of one having different values from the corresponding element, or elements in the other interstage coupling.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for plural diverse type amplifying devices.

53+, for amplifiers having distributed parameter type coupling.

70+, for series energized vacuum tube amplifiers.

88, 92 and 98, for cascaded amplifiers including signal feedback.

120+, for interstage coupling between push-pull stages of an amplifier.

133, for different bias control on different stages of a cascaded amplifier.

150, for cascaded amplifiers with similar amplifying devices having different characteristics.

151, for amplifiers with means to by-pass a stage.

157+, for interstage coupling in an amplifier.

310+, for plural stage cascaded semiconductor amplifiers.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems, appropriate subclasses for voltage magnitude and phase control systems generally, with various transformer and impedance networks to perform such functions.

333, Wave Transmission Lines and Networks,

24+, for coupling networks for wave transmission, generally.