John Stuart Malcolm

Title: Innovations of John Stuart Malcolm

Introduction

John Stuart Malcolm is a notable inventor based in Headley, GB. He has made significant contributions to the field of electronics, particularly in the development of circuits for power management. With a total of three patents to his name, Malcolm continues to push the boundaries of innovation in his industry.

Latest Patents

Malcolm's latest patents include a "Current Sensing Circuit for DC/DC Buck Converters." This invention involves a circuit and method to sense the inductor current of DC/DC buck converters. The inductor current is sensed by generating a voltage drop across a fully integrated sense resistor. This voltage drop is proportional to the inductor current in the pass device, which is achieved by supplying a fraction of the inductor current out of a source-follower that matches the pass device. The source of the source-follower is connected to a sense-resistor that shares the same supply as the pass device. The current needed to generate the voltage drop is fed back into the inductor current, minimizing efficiency loss. The circuit also includes mirroring, amplification, and offset correction of the voltage drop across the sense-resistor using a single matching pair of source-followers, supplied by a current tracking the internal reference voltage and process variations of the resistors.

Another significant patent is the "LDO Regulator with Wide Output Load Range and Fast Internal Loop." This invention presents a method and circuit to achieve a low drop-out voltage regulator with a wide output load range. A fast loop is introduced in the circuit, which is internally compensated and utilizes a capacitor to ensure that the internal pole is more dominant than the output pole, as seen in standard Miller compensation. The quiescent current is set to be proportional to the output load current, eliminating the need for an explicit low power drive stage. This design covers the entire output range with one output drive stage, thereby reducing the total consumption of quiescent or wasted current. An excellent power supply rejection ratio (PSRR) is achieved due to load-dependent bias current.

Career Highlights

John Stuart Malcolm is currently employed at Dialog Semiconductor GmbH, where he continues to innovate and develop cutting-edge technologies. His work has significantly impacted the efficiency and performance of power management systems.

Collaborations

Malcolm has collaborated with notable colleagues, including David Dearn and Axel Pannwitz, contributing to various projects and advancements in their