Voltage buffer stage with temperature-independent output.

摘要

A voltage buffer stage with temperature-independent output comprising a first transistor (T1) with a first conductivity type, having collector and emitter terminals interposed between the supply line (Vcc) and the ground and a base terminal which receives an input voltage signal (Vi), a second transistor (T2) with the opposite conductivity type which has collector and emitter terminals interposed respectively between the ground and the supply line and a base terminal connected to the emitter terminal of the first transistor, a sensor (T3) for detecting the base-emitter voltage drop (VBE2) of the second transistor and a current source (T4) controlled by the voltage drop sensor and generating a corresponding control current (Ic4) which is fed to the first transistor (T1) and forces it to operate with a base-emitter voltage drop (VBE1) equal to the base-emitter voltage drop (VBE2) of the second transistor.