Abstract: A carbon nanotube electronic circuit utilizing a differential amplifier is implemented on a single carbon nanotube. Field effect transistors are formed from a first group of electrical conductors in contact with the carbon nanotube and a second group of electrical conductors insulated from, but exerting electric fields on, the carbon nanotube form the gates of the field effect transistors. A signal input circuit has a first input portion and a second input portion. A first field effect transistor electrically responsive to a first incoming signal is formed on the first input portion. A carbon nanotube actuator having electrical terminals and responsive to electrical conditions is an electrical load. A current source, connected to the signal input circuit, is formed on the carbon nanotube from one or more second field effect transistors.

Abstract: Software for designing and testing types of nanoelectronic circuits and larger scale electronics renderings is described. The software designs circuits comprising only a chain/leapfrog topology. The chain/leapfrog topology permits a wide range of circuits and circuit modules to be implemented on a common shared carbon nanotube, graphene nanoribbon, or strips of other types of semiconducting material, for example as rendered in traditional printed electronics and nanoscale printed electronics or as employing semiconducting polymers. In one approach a chain/leapfrog topology circuit design software tool accesses information in a library of chain/leapfrog circuits data, and creates descriptive data pertaining to a number of approaches to rendering electronics components using a library of component data. The chain/leapfrog circuits data library includes designs for a number of different types of chain/leapfrog circuit modules.

Abstract: A method for identifying asymmetry in a pulse signal is disclosed. An asymmetrical condition is when the time interval of a first input pulse signal having a first value is longer than the time of a second input pulse signal having a second value. Identifying asymmetry includes receiving and detecting the instantaneous signal values of first and second input pulse signals, and associating a unique state symbol with each distinct pair of instantaneous signal values thereby producing a sequence of state symbols. A sequence of state symbols of a first type, a second type, and a third type is identified and associated with a distinct enveloping event pattern. A macroscopic behavioral signature pattern indicating an asymmetrical condition is identified when a first symmetry event symbol of a first kind is followed by a first interval having no identified symmetry event symbol, a second symmetry event symbol of a second kind, and a second interval having no identified symmetry event symbol.

Abstract: New methods for generating through-zero pulse-width modulation are disclosed. In one approach, a periodic reference signal varies over time over at least one portion of the period. A pulse-width control signal varies linearly with time over at least one portion of the reference signal. The reference signal is compared with the pulse-width control value to produce a first pulse waveform. The value of a function of the control value is subtracted from the first pulse waveform to produce through-zero pulse-width modulation. In another approach, the difference in value between two ramp or sawtooth periodic waveforms is computed to produce a pulse waveform with a time-varying DC offset that varies linearly in time. The time-varying offset-term is retained with the pulse waveform, producing through-zero pulse-width modulation.

Abstract: A method for implementing electronic circuit modules on elongated structures of semiconducting materials such as carbon nanotubes, graphene nanoribbons, elongated structures of semiconducting polymers or organic semiconductors, other related materials, and printed electronics strip structures is disclosed. The method provides that a plurality of modules can be implemented on distinct adjacent portions of the same elongated structure of semiconducting materials. In powering the modules, each circuit comprises a chain of electronic components arranged so that each end of the chain can function as a power supply terminal. Larger electronic circuit modules can be created from smaller module, and such a modular hierarchy may be extended to an arbitrary number of levels. In a Computer Aided Design (CAD) applications for nanoelectronics and printed electronics, designs for hierarchies electronic circuit modules can be stored and retrieved from one or more a libraries of circuit designs.

Abstract: A multiple transistor differential amplifier is implemented on a segment of a single graphene nanoribbon. Differential amplifier field effect transistors are formed on the graphene nanoribbon from a first group of electrical conductors in contact with the graphene nanoribbon and a second group of electrical conductors insulated from, but exerting electric fields on, the graphene nanoribbon thereby forming the gates of the field effect transistors. A transistor in one portion of the graphene nanoribbon and a transistor in another portion of the graphene nanoribbon are responsive to respective incoming electrical signals. A current source, also formed on the graphene nanoribbon, is connected with the differential amplifier, and the current source and the differential amplifier operating together generate an outgoing signal responsive to the incoming electrical signal. In an example application, the resulting circuit can be used to interface with electrical signals of nanoscale sensors and actuators.

Abstract: A multiple transistor differential amplifier is implemented on a single graphene nanoribbon. Differential amplifier field effect transistors are formed on the graphene nanoribbon from a first group of electrical conductors in contact with the graphene nanoribbon and a second group of electrical conductors insulated from, but exerting electric fields on, the graphene nanoribbon thereby forming the gates of the field effect transistors. A transistor in one portion of the differential amplifier and a transistor in another portion of the differential amplifier are responsive to an incoming electrical signal. A current source, also formed on the graphene nanoribbon, is connected with the differential amplifier, and the current source and the differential amplifier operating together generate an outgoing signal responsive to the incoming electrical signal.