US PATENT SUBCLASS 330 / 263
.~.~ Having complementary symmetry

Current as of: June, 1999
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330 /   HD   AMPLIFIERS

250  DF  WITH SEMICONDUCTOR AMPLIFYING DEVICE (E.G., TRANSISTOR) {21}
262  DF  .~ Including push-pull amplifier {8}
263.~.~ Having complementary symmetry {4}
264  DF  .~.~.~> And field effect transistor
265  DF  .~.~.~> And feedback means
266  DF  .~.~.~> And temperature compensation
267  DF  .~.~.~> And particular biasing arrangement {1}

DEFINITION

Classification: 330/263

Having complementary symmetry:

(under subclass 262) Subject matter wherein semiconductor devices of opposite conductivity are utilized.

(1) Note. Complementary symmetry is an arrangement of NPN and PNP transistors that provide push-pull operation from one

input signal.

(2) Note. There are two complementary types of conductivity in semiconductors: The N-type where conduction is largely by electrons; and the P-type where conduction appears to be largely carried by positive charges (i.e., holes). In junction transistors which consist of zones of more than one conductivity type of semiconductor material, the conductivity is determined by the control zone so that the PNP-type junction transistor is equivalent to an N-type semiconductor body or an N-type point contact semiconductor device and an NPN junction type similarly equivalent to a P-type of semiconductor device of a single conductivity type of material.