Broadband high-linearity voltage buffer with enhanced load-driving capability

The development of buffer cascades with high linearity, wide bandwidth, and the ability to work with low-impedance or capacitive loads is a pressing issue in modern analogue electronics. The aim of this work was to create a broadband, high-linearity voltage buffer with increased load capacity for use in high-precision systems. The study used computer modelling to analyse the electrical parameters of the proposed cascade and compared it with traditional circuits. A new circuit design approach to building a buffer cascade is proposed, based on an optimised output stage structure and a combination of cascode and push-pull topologies. This configuration reduces output resistance, minimises nonlinear distortion and ensures high signal transmission stability. Modelling results confirmed that the developed buffer has an extended bandwidth, improved frequency characteristics and reduced harmonic distortion over a wide frequency range. In particular, when working with high-capacity loads (up to 200 pF), a significant reduction in signal delay (up to 80-90%) was observed compared to conventional complementary metal-oxide-semiconductor implementations. The assessment of the influence of active element parameters on dynamic stability also confirmed the high reliability of the device under variable load conditions. The research results can be used to improve the performance of analogue-to-digital converters, drivers, amplifiers and control circuits operating in modes with increased current load. The practical value of the development lies in its ability to be integrated into high-precision, energy-efficient and high-speed electronic systems that require stable operation of the buffer cascade under complex load conditions