摘要:
A radio frequency power amplifier includes: an amplifying element which amplifies an input signal and outputs the signal from an output terminal; and an output load circuit which includes a first resonant circuit and a second resonant circuit that are connected to the output terminal. The first resonant circuit has a resonance frequency higher than the frequency of the second harmonic of the input signal, and the second resonant circuit has a resonance frequency lower than the frequency of the third harmonic of the input signal. The output load circuit has such an impedance looking from the output terminal that a phase of a reflection coefficient at the second harmonic of the input signal is greater than 180 degrees and less than 360 degrees, and a phase of a reflection coefficient at the third harmonic of the input signal is greater than 0 degrees and less than 180 degrees.
摘要:
A radio frequency power amplifier includes a transistor and amplifies a radio frequency signal of a first frequency; an input matching circuit connected to an input terminal of the transistor; and an output matching circuit connected to an output terminal of the transistor. A reactance control circuit includes one end connected to the output terminal of the transistor, and the other end connected to an input terminal of an output matching circuit and a bias terminal. The reactance control circuit has a reactance which resonates at a second frequency with a parasitic capacitance of the transistor at the output terminal of the transistor, and the second frequency is identical or close to the first frequency.
摘要:
A radio frequency power amplifier includes: an amplifying element which amplifies an input signal and outputs the signal from an output terminal; and an output load circuit which includes a first resonant circuit and a second resonant circuit that are connected to the output terminal. The first resonant circuit has a resonance frequency higher than the frequency of the second harmonic of the input signal, and the second resonant circuit has a resonance frequency lower than the frequency of the third harmonic of the input signal. The output load circuit has such an impedance looking from the output terminal that a phase of a reflection coefficient at the second harmonic of the input signal is greater than 180 degrees and less than 360 degrees, and a phase of a reflection coefficient at the third harmonic of the input signal is greater than 0 degrees and less than 180 degrees.
摘要:
The grip position calculator determines a grip position where the fingers can grip a workpiece in any orientation of the workpiece. The calculator then determines an initial position where the finger tips can grip the workpiece and set the initial position as a point of calculation. Then an allowable gripping force is calculated which is an index that indicates an allowable force to be applied to the workpiece at point. Then other allowable forces are calculated for a plurality of points near the point of calculation. Then the point of calculation is selected as a possible gripping position if the allowable force a point is greater than any of the allowable forces. Otherwise, one of the points is selected for another point of calculation where the greatest allowable force (De) has been calculated and return to calculating an allowable gripping force.
摘要:
A liquid crystal panel module of a liquid crystal display device includes a liquid crystal display panel on its front side and an EEFL backlight on its back side within a metal frame. A metal chassis is arranged at the center of the metal frame on the back surface of the liquid crystal panel module. A power supply circuit board and a video signal processing board are mounted on the metal chassis. An inverter board is arranged on the metal frame near one side of the metal frame on the back surface. The power supply circuit board includes a noise filter, an active filter and an isolation transformer. The inverter board includes a step-up transformer.
摘要:
There is provided a substrate processing method including cleaning a substrate by immersing the substrate in a cleaning solution in a longitudinal direction while the cleaning solution is supplied to a cleaning tank; transferring the substrate picked up from the cleaning tank to a drying chamber while holding the substrate in a longitudinal direction; and drying the substrate in the drying chamber communicating with an upper area of the cleaning tank by alternately supplying a first drying gas containing vapor of a solvent for removing a liquid and a second drying gas without containing the vapor of the solvent for removing the liquid to an area where the substrate is exposed between the upper area of the cleaning tank and the drying chamber after an upper end of the cleaned substrate is picked up from a liquid surface of the cleaning solution.
摘要:
A method for controlling a high-frequency radiator includes the steps of: (a) applying a high-frequency radiation through the solid-state oscillator and the antenna; (b) sensing part of the high-frequency radiation returned from the antenna to the solid-state oscillator; (c) adjusting radiation/propagation conditions for the high-frequency radiation on the basis of the sensed results in the step (b), the high-frequency radiation propagating from the solid-state oscillator to the antenna; and (d) after the step (c), applying the high-frequency radiation through the solid-state oscillator and the antenna to a target object. In the step (c), the oscillation frequency of the solid-state oscillator, the power of the high-frequency radiation applied by the solid-state oscillator, the power supply voltage supplied to the solid-state oscillator, the impedance match between the output impedance of the solid-state oscillator and the impedance of the antenna, or any other condition is changed.
摘要:
A film bulk acoustic resonator includes a substrate; an acoustic reflector portion formed on the substrate; and an acoustic resonator portion including a lower electrode, a piezoelectric film, and an upper electrode which are sequentially stacked on the acoustic reflector portion, An uppermost layer of the acoustic reflector portion which is in contact with the acoustic resonator portion has a root-mean-square roughness of approximately 1 nm or less.
摘要:
A vibration sensor has a bell shaped casing with a recess formed at its closed end. The recess has a flat bottom and slanted side walls so that an opening of the recess is larger than the bottom of the recess. The casing serves as a first electrode. Mercury of drop-shape is disposed in the recess, and at least two second electrodes are disposed circumferentially around the mercury. This structure creates three vibration systems; i.e., the mercury vibrates in three different modes. The first vibration system is based on the surface tension of the mercury. A portion of the mercury protruding from the recess undergoes vibration. The second vibration system is due to gravity acting on the mercury. The mercury rolls out of the recess between the electrodes in response to vibrations. The third vibration system is based on resonance. The mercury resonates between the electrodes.
摘要:
An apparatus for atomizing a large quantity of liquid such as water, liquid fuels, lotions or the like, comprises an atomizer including a body having a pressurization cavity for containing a liquid. A nozzle base, mounted on the body, has a plurality of orifices communicating with the pressurization cavity. An electric vibrator, mounted on the body, responds to an alternating voltage derived from an electric circuit. The vibrator is vibrated back and forth, to expel successively a large quantity of liquid droplets of small and uniform diameter out of the orifices.