摘要:
The invention provides a composite high frequency component constituting a part of a microwave circuit having plural signal paths corresponding to their respective frequencies, comprising: a diplexer for coupling transmitting signals from the plural signal paths for transmission and distributing receiving signals into said plural signal paths for reception; plural high frequency switches for separating the plural signal paths into a transmission section and a reception section, respectively; plural filters introduced in the signal paths; said diplexer, said high frequency switch, and said filters being integrated into a ceramic multi-layer substrate formed by lamination of plural ceramic sheet layers. According to the above described composite high frequency component, the diplexer, the high frequency switches, and the filters which constitute the composite high frequency component are integrated into the ceramic multi-layer substrate formed by lamination of plural ceramic sheet layers. Thus, the matching and adjustment between the diplexer and the high frequency switches can be easily performed. It is unnecessary to provide a matching circuit for matching and adjusting the diplexer and the high frequency switches, and moreover, the high frequency switches and the filters.
摘要:
An outer covering wall (26) and an inner covering wall (27), which are capable of surrounding a rotor (24), can be horizontally moved. A wafer carrier waiting portion (30) is disposed right below the rotor (24). A wafer holding member (41) included in a water lifter (40) moves into a wafer carrier (C) containing wafers (W) and mounted on a stage (31) (sliding table 32) included in the wafer carrier waiting portion (30), lifts up the wafers (W) and transfers the wafers (W) to the rotor (24). The outer covering wall (26) or the inner covering wall (27) surrounds the rotor (24) to define a processing chamber. The wafers (W) held on the rotor (24) are subjected to a cleaning process in the processing chamber.
摘要:
A compact variable attenuator, composite variable attenuator, and mobile communication apparatus capable of variably controlling attenuation continuously. The variable attenuator includes a first comb line comprising first and second lines which are electromagnetically coupled with a coupling coefficient M, a second comb line comprising third and fourth lines which are electromagnetically coupled with a coupling coefficient M, and first and second diodes connected to the third and fourth lines of the second comb line. A first terminal is connected to one end of the first line and a second terminal is connected to one end of the second line. The first and second diodes are connected between one end of each of the third and fourth lines and a ground with their anodes connected to one end of each of the third and fourth lines, respectively. First and second control terminals for turning the first and second diodes on and off are connected at the junction of other end of the first line and the other end of the third line and at the junction of the other end of the second line and the other end of the fourth line via resistors.
摘要:
A composite high frequency component and a mobile communication apparatus incorporating the same which needs no matching circuits and can easily be miniaturized. The composite high frequency component is constituted of a diplexer, high frequency switches, high frequency filters, and surface acoustic wave filters. The diplexer is formed by first inductors and first capacitors. The high frequency switches are formed by diodes, second inductors, and second capacitors. The high frequency filters are formed by third inductors and third capacitors.
摘要:
A control voltage is set to an acceleration control voltage which is higher than a battery voltage V by a predetermined voltage difference &Dgr;V1 within a range and delayed by a predetermined time &Dgr;T1 during acceleration at low speeds. During acceleration at low speeds, the rotational speed is less than a predetermined value and the rate of increase in rotational speed is equal to or greater than another predetermined value. The range of voltage is higher than battery voltage V and lower than the steady state control voltage of 14.5V.
摘要:
In an output buffer of a DRAM, a level shifter outputs a step-up potential responsively when an internal data signal goes low or a test mode signature goes high. An N-channel MOS transistor is rendered conductive in response to the step-up potential from the level shifter, and sets a data input terminal to a power supply potential. The internal data signal and the test mode signature share the level shifter and the N-channel MOS transistor, and hence the layout area can be small and a high-level test mode signature can be output.
摘要:
A duplexer includes a high-frequency switch, an LC filter serving as a low-pass filter, and an SAW filter serving as a band-pass filter. The high-frequency switch includes diodes, capacitors, and transmission lines. The LC filter includes capacitors and transmission lines. The high-frequency switch and LC filter are built into a multi-layer ceramic substrate, while the diodes of the high-frequency switch and the SAW filter are mounted on the substrate. The substrate is made of a low-temperature-baked ceramic material.
摘要:
A semiconductor memory device that operates in various modes such as in a normal operation mode and a disturb accelerated test mode in which two word lines are activated simultaneously, includes a boosting power supply circuit, a boosted voltage supply line, and an input terminal connected to the boosted voltage supply line. In a disturb accelerated test mode or in a burn-in test mode, an external voltage is supplied from an external power supply to the input terminal. A word line is reliably boosted in voltage in a disturb accelerated test mode.
摘要:
A resin chain is provided which includes a reinforcing plate and a resin portion having a contact surface therebetween such that it is difficult to separate the reinforcing plate from the resin portion at the contact surface. The resin chain includes outer plates with pins fitted therein and inner plates with bushings fitted therein. The outer plates and the inner plates are connected to each other in an alternate manner. A first reinforcing plate is a constituent of each outer plate. The first reinforcing plate has a pair of cylindrical front and rear boss portions with pins fitted therein and a flange portion which rises radially from the outer peripheries of the boss portions to connect the paired front and rear boss portions to each other. A second reinforcing plate is a constituent of each inner plate. The second reinforcing plate has a pair of cylindrical front and rear boss portions with bushings fitted therein and a flange portion which rises radially from the outer peripheries of the boss portion to connect the paired front and rear boss portions to each other. Resin is molded along the surfaces of the flange portions front the outer peripheries of the cylindrical boss portions so as to fill up recesses formed between the boss portions and the flange portions. The outer and inner plates are also fabricated in this way.
摘要:
A chain capable of diminishing noise and wear occurring at the time of engagement of the chain with a sprocket is provided. At least a portion of an inner surface of each inner plate, which comes into opposition to a side face of a tooth top of the sprocket at the time of engagement of the chain with the sprocket, is chamfered in a shape conforming to the contour of a side tooth form of the sprocket tooth top. Since a chamfered portion of an inner surface of each inner plate has a shape conforming to the contour of a side tooth form of a sprocket tooth top, the chamfered portion and the sprocket tooth top come into contact with each other smoothly in a state of face-to-face contact, so that the level of noise generated upon engagement of the chain with the sprocket can be reduced and it is possible to suppress the wear of the inner surface of the inner plate and that of the tooth top of the sprocket.