MOS Structures: Charge Dynamics and Circuit Design

This lecture discusses the principles of MOS structures, focusing on charge dynamics and the behavior of electric fields in semiconductor devices. The instructor explains the concept of depletion regions in P-type substrates and how fixed negative charges create an electric field. The relationship between surface potential and electric field strength is analyzed, particularly when introducing additional positive charges. The lecture also covers the design of capacitors with and without source and drain contacts, illustrating how these configurations affect capacitance. The instructor demonstrates the construction of a CMOS inverter, detailing the connections between NMOS and PMOS transistors, and explains the logic table for the circuit. The importance of isolating outputs in logic gates is emphasized, along with the role of transmission gates in circuit design. The lecture concludes with a review of the overall structure and function of the discussed circuits, providing a comprehensive understanding of MOS technology and its applications in electronic design.