The method of extension operating frequency range of source and emitter voltage follower

Abstract

The method of extension operating frequency range of source and emitter voltage follower

N.N. Prokopenko, P.S. Budyakov, I.V. Pahomov, V.V. Suvorov

Incoming article date: 18.03.2013

The paper discusses the features of method of extension of circuit’s operating frequency range of the source and the classical emitter voltage follower (VF). The features of this method based on the effect of the mutual compensation of the parasitic impedances are considered. Problem of improving operation speed of VF with output capacitance and reducing the time of establishment of transient at pulsed input voltage are discussed.
The simulation results of VF in Cadence on model of SiGe integrated transistors are given. This shows that with capacitive load high-frequency cutoff, the time of establishment of transient and the slew rate improved to tens - hundreds of times. 
The results of investigate complement of methods of improving operation speed of the classical stage with a common drain and common collector.

Keywords: operating frequency range, source follower, emitter follower, operational speed, broadband amplifier