63results about How to "Sufficient gain" patented technology

A low voltage laser device having an active region configured for one or more selected wavelengths of light emissions.

A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.

A wireless IC device includes a wireless IC chip having a power supply circuit including a resonant circuit having a predetermined resonant frequency and a radiation plate that externally radiates a transmission signal supplied from the power supply circuit and that supplies a reception signal externally transmitted to the power supply circuit. The radiation plate is connected to the power supply circuit via an electric field or the radiation plate is coupled to the power supply circuit via a magnetic field. The radiation plate is a two-surface-open type radiation plate including at least one radiation portion arranged to externally exchange a transmission-reception signal and a power supply portion arranged to exchange a transmission-reception signal with the power supply circuit.

Satellite radioterminal communications systems, methods and components thereof, can use multiple frequency segments of at least one satellite frequency band, multiple air interfaces, multiple spectrum reuse cluster sizes and/or multiple geographic cell sizes. For example, a space-based component is configured to communicate with first radioterminals in first satellite cells over a first frequency segment of a satellite frequency band, such as a first frequency segment of a satellite L-band, and to communicate with second radioterminals in second satellite cells over a second frequency segment of the same or different satellite frequency band. The space-based component also may be configured to communicate with a first radioterminal over a first air interface and to communicate with the second radioterminals over a second air interface.

A laser producing high energy ultrashort laser pulses comprises a normal dispersion segment, a gain segment, an anomalous dispersion segment with negligible nonlinearity and an effective saturable absorber arranged to form a laser cavity. Each segment is optically interconnected so that a laser pulse will propagate self-similarly therein. (A pulse that propagates in a self-similar manner is sometimes referred to as a “similariton.”) With this laser the limitations of prior art laser oscillators are avoided. Also provided are means for pumping the gain medium in the laser cavity, and means for extracting laser pulses from the laser cavity. The laser cavity is preferably a ring cavity. Preferably the laser is configured to achieve unidirectional circulation of laser pulses therein. This configuration is scalable to much higher pulse energy than lasers based on soliton-like pulse shaping.

Circuits and methods that improve linearity with use of cancellation of at least a portion, and preferably, substantially all of, at least one significant harmonic from the output of a primary circuit, e.g., the 3.sup.rd harmonic, using the output of a substantially functionally identical auxiliary circuit.

An arrangement to determine physiologic data, position, orientation and/or geometry of an object of interest includes an ultrasound unit with a multiplicity of ultrasound transducers to monitor physiologic parameters, especially motion and deformation, of an object of interest encapsulated by a body in real-time in three dimensions of space and to generate numerical control or trigger information for other medical devices.

An article having an electromagnetic coupling module attached thereto includes an electromagnetic coupling module and a PET bottle having the electromagnetic coupling module bonded thereto. The electromagnetic coupling module includes a wireless IC chip arranged to process transmission and reception signals and the feed circuit board having the wireless IC chip mounted thereon. The feed circuit board includes a feed circuit including a resonant circuit having a predetermined resonant frequency. The feed circuit performs characteristic impedance matching between the PET bottle and the wireless IC chip. The PET bottle functions as a radiator arranged to radiate a transmission signal supplied from the feed circuit using electromagnetic field coupling and to supply a received reception signal to the feed circuit using electromagnetic field coupling.

The present invention discloses a hybrid optical amplifier coupling a Raman fiber amplifier and a semiconductor optical amplifier, comprising: a laser diode generating and irradiating a laser light for a Raman optical amplification; a wavelength division multiplexer passing an incident signal light and irradiating a laser light irradiated from the laser diode in a reverse direction of the incident signal light; and a gain clamped semiconductor optical amplifier amplifying an optical signal irradiated from the wavelength division multiplexer.

A fully-differential amplifier able to operate at a low power supply voltage and provided with a common-mode signal suppression function is disclosed. This fully-differential amplifier is provided with a first fully-differential amplifier configured by a single-stage configuration inverting amplifier and canceling out the common-mode signal of the input side by a feedforward means and a second fully-differential amplifier configured by a single-stage configuration inverting amplifier and canceling out the common-mode signal of the output side by a feedback means, the output of the first fully-differential amplifier being connected to the input of the second fully-differential amplifier.

A circuit topology for gain boosted high-swing folded cascode has been improved to maximize the available dynamic range in applications having low supply voltage requirements. The circuit includes an improved gain boost amplifier that maximizes the available dynamic range for applications having low supply voltage requirements. The improved gain boosting amplifier includes a differential pair of input transistors connected to a current mirror, wherein a pair of current sources supply current to each lead of the current mirror. One lead of the current mirror is level-shifted by a transistor coupled to another current source, wherein the coupling of the transistor and the current source form the output of the amplifier. Effectively, the amplifier consists of an effective level shift and a series common-drain, common-gate amplifier. A reduction in transconductance g_m from the series combination is compensated by a current mirror ratio (K:1) between the level shift and the common-drain, common-gate amplifier. Specifically, the size of one of the transistors in the differential pair is a multiple integer (K) times the size of the other transistor in the differential pair. In addition, the size of one of the transistors in the current mirror is a multiple integer (K) times the size of the other transistor in the current mirror. Moreover the amount of current supplied by the second current source is a multiple integer (K) times the amount of current provided by the first current source.

An asymmetric slotted L-shaped antenna is provided with a wide bandwidth in an exceedingly small size with good gain across the entire bandwidth by shorting out one end of the slot and by providing a capacitor at the other end of the slot, with the result that with appropriate capacitance, spacings and dimensions, the impedance of the slotted transmission line cancels the reactance of the antenna such that the gain of the antenna can be made to match a similar sized meander line loaded antenna.