Abstract: A molded oxygen absorbent composition and a process of producing the molded oxygen absorbent composition are disclosed. The molded oxygen absorbent composition is composed of a molded product of an oxygen absorbent composition which contains an oxygen absorbing substance, water or moisture, and a swelling component capable of being swelled with water or moisture. The product is formed by pressure molding the composition. The molded oxygen absorbent composition is reduced in its size and excellent in oxygen absorbing property.

Abstract: A molded oxygen absorbent composition is composed of a molded product of an oxygen absorbent composition which contains an oxygen absorbing substance, water or moisture, and a swelling component capable of being swelled with water or moisture. The molded oxygen absorbent composition is reduced in its size and excellent in oxygen absorbing property.

Abstract: A molded oxygen absorbent composition and a process of producing the molded oxygen absorbent composition are disclosed. The molded oxygen absorbent composition is composed of a molded product of an oxygen absorbent composition which contains an oxygen absorbing substance, water or moisture, and a swelling component capable of being swelled with water or moisture. The product is formed by pressure molding the composition. The molded oxygen absorbent composition is reduced in its size and excellent in oxygen absorbing property.

Abstract: The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes small becomes the first prescribed value; and/or (2) the waveform shaping means in which, when the magnitude of the amplitude signal to be inputted becomes larger than the second prescribed value which is larger than the first prescribed value, the waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes larger becomes the second prescribed value; and an amplitude modulator for amplitude modulating the signal of the output of the angle modulator by the signal of the output of the waveform shaping means.

Abstract: A transmission device having a preferable power efficiency and a wide control range of transmission output power. A pre-stage side of a high-frequency power amplifier changes an amplitude of a high-frequency phase modulation signal according to a base band amplitude modulation signal and a gain control signal. A variable gain amplifier changes the amplitude of the high-frequency phase modulation signal according to the base band amplitude modulation signal and the gain control signal, so that the base band amplitude modulation signal is supplied to an amplifier via a linear-log converter.

Abstract: A molded oxygen absorbent composition is composed of a molded product of an oxygen absorbent composition which contains an oxygen absorbing substance, water or moisture, and a swelling component capable of being swelled with water or moisture. The molded oxygen absorbent composition is reduced in its size and excellent in oxygen absorbing property.

Abstract: The object of the present invention is to provide a transmitting apparatus and a transmitting power control method that can provide excellent power efficiency and a wide control range of transmitting output power, and a radio communication apparatus employing the transmitting apparatus. At the time of high output power, a high-frequency power amplifier (5) is operated as a nonlinear amplifier, whereby power efficiency when a transmitting signal is power-amplified can be enhanced. Further, at the time of low output power, the high-frequency power amplifier (5) is operated as a linear amplifier, whereby the control range of the transmitting output power can be extended.

Abstract: A transmitting apparatus includes a polar signal producing circuit which produces signals corresponding to the amplitude and the phase of a transmitting modulated wave from an input signal and multiplies the amplitude signal by the phase signal by a multiplying circuit to amplitude modulate a phase-modulated wave to produce a transmitting modulated wave and radiates this transmitting modulated wave as radio wave from an antenna. An amplitude/phase detecting circuit detects an amplitude signal and a phase signal from the input of the multiplying circuit and the input of a phase-modulated signal producing circuit.

Abstract: A polar modulation transmission apparatus is provided which can adjust synchronization between an amplitude signal and phase signal in a simple configuration accurately and automatically. A polar signal generation circuit 101 sends an amplitude signal and phase signal for synchronization adjustment to transmission lines of these signals, incorporates the amplitude signal and phase signal for synchronization adjustment output from low pass filters 104, 132 which are final stage circuits that process the respective signals in their baseband signal states into a delay difference detection circuit 109, a synchronization adjustment control circuit 110 obtains a synchronization adjustment value at which the delay difference between the signals is eliminated based on the delay difference detection result and a synchronization adjustment circuit 102 gives delays corresponding to the synchronization adjustment value to the respective signals.

Abstract: The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes small becomes the first prescribed value; and/or (2) the waveform shaping means in which, when the magnitude of the amplitude signal to be inputted becomes larger than the second prescribed value which is larger than the first prescribed value, the waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes larger becomes the second prescribed value; and an amplitude modulator for amplitude modulating the signal of the output of the angle modulator by the signal of the output of the waveform shaping means.

Abstract: There is provided a transmission device having a preferable power efficiency and a wide control range of transmission output power. At the pre-stage side of a high-frequency power amplifier (105) for changing the amplitude of a high-frequency phase modulation signal (S4) according to a base band amplitude modulation signal (S2) and a gain control signal (S12), there is provided a variable gain amplifier (201) for changing the amplitude of the high-frequency phase modulation signal (S4) according to the base band amplitude modulation signal (S2) and the gain control signal (S12), so that the base band amplitude modulation signal (S2) is supplied to a variable gain amplifier (203) via a linear-log conversion unit (206).

Abstract: The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes small becomes the first prescribed value; and/or (2) the waveform shaping means in which, when the magnitude of the amplitude signal to be inputted becomes larger than the second prescribed value which is larger than the first prescribed value, the waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes larger becomes the second prescribed value; and an amplitude modulator for amplitude modulating the signal of the output of the angle modulator by the signal of the output of the waveform shaping means.

Abstract: The object of the present invention is to automatically adjust the synchronization of an amplitude signal and a phase signal in a transmitting apparatus such as polar modulation transmitting apparatus. A polar signal producing circuit (101) produces signals corresponding to the amplitude and the phase of a transmitting modulated wave from an input signal and multiplies the amplitude signal by the phase signal by a multiplying circuit (107) to amplitude modulate a phase-modulated wave to produce a transmitting modulated wave and radiates this transmitting modulated wave as radio wave from an antenna (108). An amplitude/phase detecting circuit (109) detects an amplitude signal and a phase signal from the input of the multiplying circuit (107) and the input of a phase-modulated signal producing circuit (106).

Abstract: A variable gain amplifier circuit is provided so that an electric current decreases when a voltage gain is lowered and that the amplifier circuit is substantially free of a deterioration in distortion characteristics. The bases of bipolar transistors Q1, Q3 and Q5 and the bases of bipolar transistors Q2, Q4 and Q6 are connected in common with each other, these bipolar transistors forming a plurality of common-emitter amplifier circuits, and switches SW2, SW1 and SW0 are connected to the respective sides of the bipolar transistors. The emitter sides are held at a ground potential gnd by switching the switches SW2, SW1 and SW0 so that the voltage gain is controlled by selecting the common-emitter amplifier circuits different in voltage gain. A collector current I0 and an emitter degeneration resistance Re between the common-emitter amplifier circuits are so arranged as to have different values.

Abstract: A polar modulation transmission apparatus is provided which can adjust synchronization between an amplitude signal and phase signal in a simple configuration accurately and automatically. A polar signal generation circuit 101 sends an amplitude signal and phase signal for synchronization adjustment to transmission lines of these signals, incorporates the amplitude signal and phase signal for synchronization adjustment output from low pass filters 104, 132 which are final stage circuits that process the respective signals in their baseband signal states into a delay difference detection circuit 109, a synchronization adjustment control circuit 110 obtains a synchronization adjustment value at which the delay difference between the signals is eliminated based on the delay difference detection result and a synchronization adjustment circuit 102 gives delays corresponding to the synchronization adjustment value to the respective signals.

Abstract: The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes small becomes the first prescribed value; and/ or (2) the waveform shaping means in which, when the magnitude of the amplitude signal to be inputted becomes larger than the second prescribed value which is larger than the first prescribed value, the waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes larger becomes the second prescribed value; and an amplitude modulator for amplitude modulating the signal of the output of the angle modulator by the signal of the output of the waveform shaping means.

Abstract: By etching, a first groove and a second groove are formed in a silicon substrate. Surfaces of the side walls of these grooves have a surface orientation of (111). The first and second grooves sandwich a silicon thin plate therebetween, which is formed as a part of the silicon substrate. The silicon thin plate is sufficiently thin so as to act as a quantum well. Further, a pair of silicon oxide films acting as tunneling barriers are formed on the surfaces of the side walls of the silicon thin plate, thus forming a double barrier structure. In addition, a pair of polysilicon electrodes are formed and sandwich the double barrier structure. As a result, the structure of a resonance tunneling diode, which utilizes the resonance tunneling effect, is provided. Adding a third electrode to the above structure provides a resonance tunneling transistor.

Abstract: A quantum device including a plate-like conductor part having a necking portion and a method of producing the same are disclosed.

Abstract: A silicon substrate comprises at least two surfaces extending substantially along respective crystal faces of (111) crystal orientation of the silicon, the crystal faces of (111) crystal orientation crossing with each other, an electrically insulating layer formed by oxidizing the silicon substrate from the surfaces, and an electrically conductive portion insulated electrically by the electrically insulating layer from an outside of the silicon substrate.

Abstract: By etching, a first groove and a second groove are formed in a silicon substrate. Surfaces of the side walls of these grooves have a surface orientation of (111). The first and second grooves sandwich a silicon thin plate therebetween, which is formed as a part of the silicon substrate. The silicon thin plate is sufficiently thin so as to act as a quantum well. Further, a pair of silicon oxide films acting as tunneling barriers are formed on the surfaces of the side walls of the silicon thin plate, thus forming a double barrier structure. In addition, a pair of polysilicon electrodes are formed and sandwich the double barrier structure. As a result, the structure of a resonance tunneling diode, which utilizes the resonance tunneling effect, is provided. Adding a third electrode to the above structure provides a hot electron transistor.