Nuevo artículo publicado: “Stability of Power Supply Bootstrapped Unity-Gain Buffers”

Se publicó un núevo artículo del GIBIC en IEEE Transactions on Circuits and Systems II: Express Briefs.

“Stability of Power Supply Bootstrapped Unity-Gain Buffers”

Federico N. Guerrero; Enrique M. Spinelli

https://ieeexplore.ieee.org/document/9832427

Abstract:

Power-supply bootstrapping is a technique based on applying a DC-shifted copy of the input signal to the supply terminals of an operational amplifier (OA). It is usually applied configuring the OA as a unity-gain buffer, and achieves an increased input impedance or an extended voltage range for a device. However, bootstrapped circuits can become unstable for reasons that are not evident when considering the most simple OA models. In this work, we show the mechanism producing instabilities in these circuits and the necessary equations for stability analysis are determined. Stability can be studied by considering the power-supply and common-mode rejection ratio curves thanks to an intrinsic relationship between them. A realistic OA model from the literature was chosen as validation for the presented method and as a study-case to show the rationale for the stability analysis and possible compensation strategies. The proposed method was successfully applied to compensate bootstrapped buffers in experimental tests.

Published in: IEEE Transactions on Circuits and Systems II: Express Briefs ( Early Access )

Page(s): 1 – 1

Date of Publication: 18 July 2022 

DOI: 10.1109/TCSII.2022.3191989

Publisher: IEEE