US PATENT SUBCLASS 330 / 157
INTERSTAGE COUPLING

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

157INTERSTAGE COUPLING {11}
158  DF  .~> Coupling to cathode {1}
160  DF  .~> Coupling to plate or auxiliary grid {1}
162  DF  .~> Output coupling from grid {1}
164  DF  .~> With electronic tube or diode in coupling circuit
165  DF  .~> Transformer coupling {6}
172  DF  .~> Coupling from cathode {1}
174  DF  .~> With electromechanical transducer (e.g., piezoelectric crystal)
175  DF  .~> With lattice or Wheatstone bridge network in coupling circuits
176  DF  .~> With T, H, or Pi network in coupling circuit
177  DF  .~> With coupling or blocking capacitor {3}
181  DF  .~> D.C. coupled {3}

DEFINITION

Classification: 330/157

(under the class definition) Subject matter wherein the amplifier is comprised of at least two amplifying devices in cascade, the two being in direct proximity in the cascaded circuit and wherein there are significant details or distinctive characteristics of the circuit by means of which the signal output of the preceding amplifying device is coupled to the signal input of the following cascaded amplifying device, or wherein the parameters or electrical characteristics of the output of the preceding device or the input of the following device, are claimed.

(1) Note. Subject matter disclosing interstage coupling but wherein only the output coupling of the first amplifying device is claimed or wherein only the input coupling of the following amplifying device is claimed is classified in this

and appropriate indented subclasses and not with input or output coupling under subclasses 185+ or 192+, respectively.

(2) Note. The output of the preceding amplifying device of the cascaded devices has an output electrode and a common electrode for the signal and the input of the following stage has an input electrode and a common electrode, to receive the signal. Thus, there is involved a four terminal coupling network between output (including common electrode) and input (including common electrode) with usually two-series circuits between output and input electrodes and between common electrodes respectively and also shunt circuit elements often between such series circuits.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3, for plural diverse type amplifying devices which may involve interstage coupling between such devices.

53+, for coupling of distributed parameter type which may be interstage. 65+, for structure of circuit elements, other than transformer structure, which may be involved in interstage coupling.

70+, for interstage coupling between cascaded series energized tubes.

88+, 92, and 98+, for interstage coupling in cascaded feedback amplifiers.

120, for interstage coupling in push-pull amplifiers.

133, for cascaded amplifiers having bias voltage control which may involve interstage coupling.

143, for thermally responsive impedance which may be involved in interstage coupling.

144+, for variable impedance controlled by separate control path which may be involved in interstage coupling.

150, for cascaded stages having amplifiers of different characteristics with interstage coupling means.

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

152+, for diverse types interstage coupling in amplifiers having plural cascaded stages.

155, for unicontrol of coupling means which may involve interstage coupling.

156, for bootstrap coupling. 185+, for amplifiers with input coupling networks. See (1)

Note above.

192+, for amplifiers with output coupling networks. See (1) Note above.

310+, for plural stage cascaded semiconductor amplifiers, involving interstage coupling.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

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