ES420460A1 - A level changing circuit device. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

A level changing circuit device including first and second transistors of a conductivity type, each transistor having base, emitter and collector electrodes; input means for supplying an input signal referred to a first voltage level to the base electrode of said first transistor; first and second voltage terminals to provide a reference potential between them; means for connecting the collector electrode of said first transistor to one of said voltage terminals; output means including a third transistor of said type of conductivity having base, emitter and collector electrodes; means for connecting the emitter and collector electrodes of said third transistor between said first and second voltage terminals; and an output terminal connected to one of the emitter and collector electrodes of said third transistor to obtain an output signal therein referred to a second level of dc voltage; characterized by means including a first resistor for connecting the emitter electrode of said first transistor to the collector electrode of said second transistor; means including a second resistor for connecting the emitter electrode of said second transistor to the other of said voltage terminals; biasing means for supplying a bias voltage to the base electrode of said second transistor, and means for connecting the collector electrode of said second transistor to the base electrode of said third transistor, and wherein the ohmic values of said resistors first and second, they admit a relationship such that the difference between said first and second continuous voltage levels remains substantially constant regardless of temperature variations. (Machine-translation by Google Translate, not legally binding)