摘要:
A current measuring method, which measures a device current flowing through a terminal of a semiconductor device including charging the capacitor which is connected between the terminal and an earth potential of the semiconductor device, up to a predetermined voltage; setting the semiconductor device to be in active sate by applying a test pattern to the semiconductor device; measuring a potential of the capacitor at the terminal side after a predetermined test time has elapsed; and judging whether the device current is within a predetermined allowable range, based on the test time, capacitance of the capacitor, and the potential.
摘要:
A power supply unit which supplies voltage to electric components, includes: a DC power supply (40) which supplies DC voltage to the electric components; at least one capacitor (C1), provided between the DC power supply (40) and the electric components, which charges the DC voltage; an input switch (SW1a) which connects or disconnects the capacitor (C1) and the DC power supply (40); and an output switch (SW1b) which connects or disconnects the capacitor (C1) and the electric components (semiconductor device under test); and a switching control unit (60) which charges the capacitor (C1) and supplies the DC voltage charged in the capacitor (C1) to the electric components. Thereby, the DC voltage to be supplied to the electric components or semiconductor device under test can be temporarily switched to low-noise DC voltage supplied from the charged-up capacitor (C1) during the test.
摘要:
In an IC testing apparatus, a sense line which is used for purpose of voltage measurement and a force line which is used for purpose of current supply are connected to a terminal of an IC under test through a first switch and a second switch, respectively, and a functional tester is connected to the terminal of the IC under test through a third switch. The first to the third switch are formed by semiconductor switches, and a fourth switch formed by a semiconductor switch having a reduced on resistance is connected across terminals of the first switch and the second switch which are located opposite from their terminals connected to the terminal of the IC under test. During an overload test in the DC test, the fourth switch is turned on to execute the test.
摘要:
An applied-voltage-based current measuring apparatus in which an operational amplifier is supplied at its non-inverting input terminal with a predetermined voltage and at its inverting input terminal with a voltage to be applied to a load. A current measuring resistor is connected between the output terminal of the operational amplifier and the load and a voltage which is created across the current measuring resistor is measured to thereby measure a current flow to the load in the state of being supplied with a predetermined voltage and in which a plurality of current measuring resistors are connected in series in correspondence to current measuring ranges. Switching elements for current bypass use, each of which turns ON when the voltage created across the corresponding current measuring resistor reaches a predetermined value, are connected in parallel to the current measuring resistors. Automatically carrying out sequential measurements of voltages created at respective ends of the current measuring resistors. The measured results are subjected to subtraction processing to compute voltages which are developed across the current measuring resistors. The apparatus selects from the computed results an optimum value contained in any one of the measuring ranges, thereby specifying the current flowing to the load.
摘要:
A thin film forming apparatus is formed of a vacuum chamber, a base plate holder for holding a base plate near a central part of the vacuum chamber, and ECR plasma generating devices respectively connected to both side portions of the vacuum chamber. A magnetic field generating device is situated adjacent to the vacuum chamber for generating a predetermined magnetic field in the vacuum chamber, and a gas introducing system is connected to the vacuum chamber for introducing a reaction gas into the vacuum chamber. Since the base plate holder has a shape corresponding to an external shape of the base plate, a distance between the base plate and the base plate holder is uniform. The films with uniform thicknesses can be formed on both surfaces of the base plate.
摘要:
A voltage supply circuit is provided which is capable of rapidly terminating a fluctuation in the voltage at the voltage output terminal of a feedback type voltage supply and restoring the voltage to a steady-state value. The feedback type voltage supply has a voltage output terminal to which a current supply circuit and a current absorbing circuit are connected. The current supply circuit comprises a voltage source for generating a voltage slightly less than the steady-state voltage at the voltage output terminal, a first diode 33 having a cathode connected to the voltage output terminal, a second diode having a cathode connected to the voltage source, and a current source having a current output terminal connected to the junction between the anodes of the first and the second diode. The current absorbing circuit comprises a voltage source for outputting a voltage slightly above the steady-state voltage at the voltage output terminal, a third diode having an anode connected to the voltage output terminal, a fourth diode having an anode connected to the voltage source, and a current source having a current output terminal connected to the junction between the cathodes of the third and the fourth diode.
摘要:
The drive substrate and an opposed substrate are joined to each other through a gap in which a liquid crystal is held. Pixels electrodes are provided on the drive substrate in a matrix form and, an opposed electrode is formed on the entire surface of the opposed substrate. The drive substrate 1 has a plurality of thin film transistors each for switching one of the pixel electrodes, a first interlayer insulating film for covering the thin film transistors, interconnect electrodes patterned on the first interlayer insulating film and connected to the thin film transistors, a second interlayer insulating film for covering the interconnect electrodes and a black matrix patterned on the second interlayer insulating film and used for shielding the thin film transistors beneath the second interlayer insulating film. The black matrix is covered by a planerization layer and the pixel electrodes are patterned on the planerization layer. The pixel electrodes are connected to the interconnect electrodes through the black matrix 10 which is made up of a metal film. In a display device of the active matrix type, an on-chip black structure is thus obtained by providing a black matrix also referred to as a light-shielding layer on a drive substrate.
摘要:
A biological process for predominantly producing an optically active .alpha.-hydroxycarboxylic acid having a phenyl group directly from a racemic .alpha.-hydroxynitrile or a mixture of an aldehyde corresponding to the nitrile and prussic acid as a substrate is disclosed, comprising reacting a microorganism belonging to the genus Rhodococcus, Alcaligenes, Brevibacterium or Pseudomonas with the substrate in a neutral to basic aqueous medium. A desired optically active .alpha.-hydroxycarboxylic acid having a phenyl group can be obtained quantitatively at a high optical purity.
摘要:
A method of producing an optically active amino acid is disclosed which comprises converting a mixture of an amino group-containing compound, e.g., an alkanediamine, and fumaric acid into an optically active amino acid by the action of a microorganism. The method is useful in industrially producing an optically active amino acid from the inexpensive starting materials, i.e., fumaric acid and an amino compound, under mild conditions of ordinary temperature and ordinary pressure.
摘要:
A process for the production of .alpha.-hydroxy acids or .alpha.-hydroxyamides in which an .alpha.-hydroxynitrile compound or a mixture consisting of an aldehyde and prussic acid, which corresponds to the nitrile compound, is allowed to undergo a microbial reaction to produce the corresponding .alpha.-hydroxy acid or .alpha.-hydroxyamide, wherein the improvement resides in that phosphite ions or hypophosphite ions are allowed to be present in the reaction system. According to the present invention, since hydrolysis or hydration of nitrile compounds can be carried out by constantly keeping a low concentration level of aldehydes which are considered to be a cause of the enzyme inhibition in the reaction system, the enzyme activity can be maintained stably for a prolonged period of time and the formed acids or amides can therefore be accumulated in a high concentration.