We developed a fully analytical ballistic theory of carbon nanotube field effect transistors enabled by the development of an analytical surface potential capturing the temperature dependence and gate and quantum capacitance electrostatics. The analytical ballistic theory is compared to the experimental results of a ballistic transistor with good agreement. The validated analytical theory enables intuitive circuit design, provides techniques for parameter extraction of the bandgap and surface potential, and elucidates on the device physics of drain optical phonon scattering and its role in reducing the linear conductance and intrinsic gain of the transistor. Furthermore, a threshold voltage definition is proposed reflecting the bandgap-diameter dependence. Projections for key analog and digital performances are discussed.
This paper reports the fabrication and performance of laterally actuated, polysilicon-platinum composite nanoelectromechanical (NEM) relays. Laterally actuated relays are defined in a single lithography step, enabling symmetric electrode and beam structures. The platinum coating serves as the conducting contact material and can also provide a local routing layer. Decoupling mechanical and electrical properties of the NEM relay allows independent optimization of each property. The NEM relays exhibited less than 3kΩ contact resistance and can operate for 10 8 cycles in room ambient.
This paper presents techniques for designing nanoelectromechanical relay-based logic circuits using six-terminal relays that behave as universal logic gates. With proper biasing, a compact 2-to-1 multiplexer can be implemented using a single six-terminal relay. Arbitrary combinational logic functions can then be implemented using well-known binary decision diagram (BDD) techniques. Compared to a CMOS-style implementation using four-terminal relays, the BDD-based implementation can result in lower area without major impact on performance metrics such as delay, and energy (when the relays are scaled to small dimensions). Although it is possible to implement any combinational circuit with a single mechanical delay, the relay count can be significantly reduced for complex logic functions by allowing multiple mechanical delays.Index Terms-Binary decision diagram, logic synthesis, nanoelectromechanical (NEM) relays, nanotechnology.
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