摘要:
A bandpass filter circuit 10 of the present invention includes: transconductance amplifier circuits 1 to 3; a common-mode feedback circuit 4 which outputs a first control signal to the transconductance amplifier circuit 1 so that a D.C. voltage level of a differential output of the transconductance amplifier circuit 1 is at a predetermined level; a common-mode feedback circuit 5 which outputs a second control signal to the transconductance amplifier circuit 2 so that a D.C. voltage level of a differential output of the transconductance amplifier circuit 2 is at a predetermined level; and capacitors C1 to C3. Each of the members are connected as shown in FIG. 1. With the configuration, a bandpass filter circuit capable of adjusting constants such as a Q-value is realized.
摘要:
Piezoelectric devices and associated fabrication methods are disclosed. An exemplary piezoelectric device includes a piezoelectric vibrating piece having first and second electrodes and first and second surfaces, a glass base having first and second surfaces, and a lid. These three parts also form the device package. The first surface of the piezoelectric vibrating piece is mounted to the base, and the lid is mounted to the second surface of the piezoelectric vibrating piece to seal the package. The glass base includes first and second metal wires having ends that protrude from the surfaces of the base. The side surfaces of the protruding wire ends are connected to the first and the second electrodes, respectively. Manufacture is performed using whole wafers that are processed, sandwiched, bonded, and then cut to produce individual devices.
摘要:
Disclosed is a method for producing an antimutagenic substance by using a lactic acid bacterium, which can produce the antimutagenic substance in a large quantity in an extremely simple manner and is economically advantageous; particularly a method for producing an antimutagenic substance effective for a carcinogenic substance, particularly a heterocyclic amine (HCA) which is a carcinogenic substance derived from a food, by using a lactic acid bacterium. Specifically disclosed is a method for producing an antimutagenic substance by using a lactic acid bacterium, which is characterized by suspending the lactic acid bacterium in a poorly nutrient or nutrient-free medium and leaving the lactic acid bacterium in the medium. Preferably, the poorly nutrient or nutrient-free medium is selected from the group consisting of physiological saline, a phosphate-buffered saline without a calcium or magnesium salt (PBS (−)), a citrate buffer, a distilled water, an ion-exchanged water, a natural water, a well water, a tap water, a mineral-added water, a vitamin-added water, an ion supply beverage for an athlete and the like. More preferably, the lactic acid bacterium is Lactobacillus plantarum strain KK-2503 or Lactobacillus alimentarius strain KN-15.
摘要:
The reference current source circuit (10) is provided with a current source circuit (1), a trimming fuse (3), a switching circuit (2) which connects/disconnects the current source circuit (1) and/from the trimming fuse (3), a NAND circuit (4) which controls the operation of the switching circuit (2), and a pull-down resistor (R1) which connects one input terminal of the NAND circuit (4) to a GND terminal. The NAND circuit (4) controls the operation of the switching circuit (2) upon receipt of control signals (S1 and S2) and also in accordance with a signal of the one input terminal of the NAND circuit (4) so as to connect the current source circuit (1) to the trimming fuse (3). This arrangement makes it possible to measure characteristics of a semiconductor integrated circuit after fuse trimming. In addition, it is possible to maintain the state after fuse trimming without the supply of a signal from outside. Moreover, a reference current source circuit which does not consume extra consumption current is realized.
摘要:
Devices are disclosed that include a piezoelectric vibrating piece; a glass base and lid form a package enclosing the piezoelectric vibrating piece. The piece has first and second electrodes. The base has first and second opposing surfaces. The base mounts the piezoelectric vibrating piece, and the lid seals the piezoelectric vibrating piece in the package. The base includes first and second metal wires, extending therethrough, whose ends are denuded to the first and second surfaces and connected to the first and second electrodes, respectively. In disclosed methods for making the packaged devices, such as piezoelectric oscillators, multiple packaged devices are made simultaneously by stacking and simultaneously bonding respective wafers on which glass bases, piezoelectric vibrating pieces, and lids have been formed.
摘要:
The present invention provides an angular velocity sensor and a method of fabrication thereof that facilitates the work of affixing a tuning-fork-type crystal element and adjusting the same, preventing waste caused by scrapping defective products and also encouraging miniaturization of components. The angular velocity sensor comprises: a tuning-fork-type crystal element which is provided with a drive electrode for exciting the vibration of the tuning fork and a sensor electrode for detecting an electrical charge that is generated in response to an angular velocity that is being detected; an independent pedestal to which a main surface of a tuning-fork base portion of the tuning-fork-type crystal element is previously affixed to form an integrated unit; a main package for surface mounting, in which the tuning-fork-type crystal element is hermetically sealed and which has a cavity with an inner base surface to which the pedestal integrated with the tuning-fork-type crystal element is affixed; and an IC having an oscillation circuit for driving the tuning-fork-type crystal element and a signal processing circuit for creating a signal in correspondence to the angular velocity corresponding to the electrical charge, and which is also disposed either inside or outside the package. The pedestal has a weight and/or shape that ensures that the center of gravity of the tuning-fork-type crystal element that is integrated therewith moves towards the tuning-fork base portion side, maintaining the horizontal alignment of the tuning-fork-type crystal element.
摘要:
An oscillator circuit includes: a charge and discharge circuit for charging or discharging a capacitor; and a signal generating circuit for generating a signal in which (i) an interval time period indicative of a cycle on which cycle a receiving device performs a periodical intermittent operation and (ii) a watch time period indicative of a time period during which the receiving device performing the periodical intermittent operation is in an ON state are set based on a charge and discharge signal which varies according to charging and discharging of the charge and discharge circuit with respect to the capacitor. Further, the signal generating circuit sets in the signal (i) the interval time period based on a difference between first and second voltages and (ii) the watch time period based on a difference between third and fourth voltages. The third and fourth voltages fall in a range between the first and second voltages. With the interval time period and the watch time period thus set in the signal, the periodical intermittent operation of the receiving device is realized.
摘要:
A semiconductor device includes a power device, and a driver which drives the power device. The driver includes a capacitor which is charged or discharged in correspondence to an external control signal, a first comparator which compares a voltage of the capacitor with a first reference voltage, and outputs a first signal based on a result of the comparison, a drive controller which outputs a drive signal in correspondence to the first signal to the power device; and a capacitor charger which detects the voltage of the capacitor, and supplies a current to the capacitor to charge the capacitor when the voltage of the capacitor is increasing within a given range.
摘要:
An exposure apparatus for performing direct exposure on a relatively moving exposure target substrate comprises: a plurality of exposure heads arranged so that an overlapping exposed area occurs between exposed areas formed on the exposure target substrate as a result of exposure by the exposure heads; and light adjusting means for adjusting the amount of light to be projected from two adjacent exposure heads onto the overlapping exposed area so that the amount of the projected light becomes equal to the amount of light that a single exposure head would project onto an exposure area if the exposure area were to be exposed through the same pattern by the single exposure head alone.
摘要:
A drum type washing and drying machine includes a cylindrical rotary drum provided with multiple drum perforations on the cylindrical surface thereof and having a rotating shaft in a horizontal or a slanted direction, a water tub, supported in a main body of the machine, for accommodating the rotary drum therein; an air circulation channel for re-circulating air exhausted from the rotary drum back into the rotary drum via a dehumidification unit and a heating unit; and a lint trap device, installed in the air circulation channel, for filtering lint generated from laundry. The lint trap device at least includes a first and a second filter member capable of being detachably attached to each other, and the assembly of the first and the second filter member is freely attachably and detachably installed on a front upper portion of the main body in an approximately horizontal direction.