Abstract:
An organic thin film transistor comprising a first gate, a second gate, a semiconducting layer located between the first gate and second gate and configured to operate as a channel and a source electrode and a drain electrode connected to opposing sides of the semiconductor layer. The organic thin film transistor also comprises a first dielectric layer located between the first gate and the semiconducting layer in a direction of current flow through the semiconductor layer, the first dielectric layer comprising a polar elastomeric dielectric material that exhibits a double layer charging effect when a set voltage is applied to the first gate and a second dielectric layer located between the second gate and the semiconducting layer.
Abstract:
L'invention concerne un circuit de pilotage pour un système de chauffage comprenant un dispositif de chauffage électrique (2), une alimentation de puissance (1), configurée pour permettre d'alimenter ledit dispositif de chauffage électrique (2), et un transistor de puissance (3). Ledit circuit de pilotage comprenant une alimentation (4) configurée pour générer un signal de consigne, un module de commande (5) du transistor de puissance (3), un filtre RC (6), comprenant une résistance RG et un condensateur CG, interposé entre le module de commande (5) et l'électrode d'entrée du transistor de puissance (3). Le dispositif comprend un circuit (7, 8, 9) de commande de fermeture configuré pour, pendant au moins une partie du temps durant lequel le signal de consigne est à l'état bas, court-circuiter le condensateur CG du filtre RC (6).
Abstract:
Disclosed is a simple and cost-effective circuit arrangement for providing current by means of an inductive component which is impinged upon with the supply voltage using a switch element. The aim of the invention is to guarantee that the current increases quickly and securely during a first phase of current supply. The inductive component is impinged upon with a constant voltage during the first phase of current supply and with the supply voltage during a successive second phase of current supply, whereby said constant voltage is generated by a constant voltage source.
Abstract:
A fast switching device for passing or blocking signals between two input/output ports includes a transistor (102) having a first and second terminal and a control terminal. The first and second terminals are connected between the two ports. The transistor passes signals between the ports when the transistor is turned on and blocks the passage of signals between the ports when the transistor is turned off. When a signal is passed between the two ports, it experiences an internal resistance of the switch, Ri, an internal capacitance of the switch when it is turned on, Ci, and an external capacitance such as bus capacitance Cb. The combination of the resistance Ri with the capacitances (Ci+Cb) cause a delay to the signal approximately equal to the time constant Ri (Ci+Cb). Embodiments of the device provide for total delay Ri (Ci+Cb) caused by the device to be less than the delay caused by a typical logic buffer, e.g., 6.5 nanoseconds for a 74F244, allowing this device to replace logic buffers as communication devices as a means of reducing signal delay. The device further includes a driver (104) for controlling the control terminal of the transistor for turning it on or off. Embodiments of the device provide for turning on and off times of the transistor comparable to that of a typical buffer, e.g., less than 7 nanoseconds for a 74F244.
Abstract:
A transistor-based switch is coupled to a replica circuit that includes transistor circuitry similar to that of the switch. The replica circuit biases a switched transistor to promote linear operation of the switch.
Abstract:
A high-speed, high-accuracy DAC has multiple current switches. Each current switch includes a current source that provides a reference current, first and second circuit elements that couple to the current source, and first and second transistors that couple to the first and second circuit elements, respectively. The first transistor provides the reference current to a first output when enabled, and the second transistor provides the reference current to a second output when enabled. The first and second circuit elements provide source degeneration for the first and second transistors, extend the linear operating region for these transistors, and may be implemented with either transistors that are always turned on or resistors. The first and second transistors and the first and second circuit elements may be P-channel field effect transistors (P-FETs), N-channel field effect transistors (N-FETs), or transistors of some other type.
Abstract:
A system, method and apparatus for an electromagnetic pulse generator is provided. In one embodiment of the present invention, a computer software interface (10) provides control signals to an array of electronic pulse generation gates. Electromagnetic pulses generated by the array of electromagnetic pulse generation gates may be aggregated to form a desired waveform. One feature of the invention is that the electromagnetic waveforms generated are compatible with a number of different communications methods and technologies.
Abstract:
An integrated circuit driver (165A, 165B) provides, among other things, a high data communication rate, a large common mode output voltage range, avoidance of spikethrough current that increases power consumption, improved switching speed using current-steering techniques, and improved matching of steady-state output current in the high logic state to that of the low logic state. The driver (165A, 165B) includes complementary differential pairs (212, 214) and associated current mirror circuits (216, 222) that differentially source/sink current at a pair of load conductors (110A, 110B) to drive the load conductors (110A, 110B) into a logic state. A single-ended embodiment is also described.