US PATENT SUBCLASS 327 / 491
.~.~.~.~.~ With emitter follower

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

365  DF  GATING (I.E., SWITCHING INPUT TO OUTPUT) {12}
419  DF  .~ Utilizing three or more electrode solid-state device {7}
478  DF  .~.~ Bipolar transistor {2}
482  DF  .~.~.~ Plural {6}
489  DF  .~.~.~.~ Control circuit with common emitter {2}
491.~.~.~.~.~ With emitter follower

DEFINITION

Classification: 327/491

With emitter follower:

(under subclass 489) Subject matter wherein the control circuit has a transistor amplifier circuit configuration which is characterized by relatively high input impedance, low output impedance, and a voltage gain of less than unity.