Inverter-Based Differential Amplifiers With Back-Gate Feedback Linearization

TL;DR

This paper demonstrates that using back-gate feedback in FD-SOI inverter-based differential amplifiers significantly enhances linearity and IP3 performance without increasing noise, leveraging negative feedback for improved linearization.

Contribution

It introduces a novel back-gate feedback technique in FD-SOI technology to linearize inverter-based differential amplifiers, achieving substantial IP3 improvement.

Findings

IP3 improved by at least 60 times with feedback

Back-gate feedback makes gain load-independent

No additional noise introduced by feedback

Abstract

Feeding the common-source amplifier output to the back-gate terminal in fully depleted silicon on insulator (FD-SOI) technology exploits the linearizing effect of negative feedback. Analysis and simulation results in 22 nm FD-SOI show that back-gate feedback sets the overall gain approximately independent of the load, contributes no additional noise, and improves linearity by the back-gate voltage gain. Third-order intercept point (IP3) enhancement is at least $60\times$ compared to without feedback in inverter-based, or complementary common-source, differential amplifiers.