Abstract: An input signal (Vin) is divided into n (?3) number of divided signals which are weighted by first weights (ki). The weighted divided signals are processed by n number of signal processing means 1 to n performing the same signal processing. The processed divided signals are weighted by second weights (li) and added to obtain an output signal (Vout). By selecting the first weights (ki) and the second weights (li), it is possible to eliminate noise or eliminate distortion.

Abstract: When an input signal to be amplified is very small and a large blocking signal having a high frequency is included in an input, it is necessary for a filter for mobile communication for removing thereof that a common-mode signal rejection ratio is large. Further, even in the case of an amplifier having a high gain, it is preferable that the common-mode rejection ratio is large in order to avoid saturation of the amplifier by noise. A common-mode rejecting characteristic is added to an input stage by making transconductance circuits of an input of an integrating circuit proposed by Nauta differential circuits and connecting thereof in cross connection. Thereby, a filter as well as an amplifier improving the common-mode rejection ratio of a total, are realized by being applied to a CMOS process or a BiCMOS process.

Abstract: A voltage-to-current conversion circuit composed of MOSFETs of the same polarity and an OTA with Rail-to-Rail with a simple configuration that uses the same have been disclosed. The voltage-to-current conversion circuit comprises a first MOSFET, to which a fixed drain-source voltage is applied all the time, and which generates a first current signal for an input voltage, a second MOSFET, which has the same polarity as that of the first MOSFET, to which the fixed drain-source voltage is applied all the time, and which generates a second current signal complementary to the first current signal for the input voltage, and a difference current operation circuit that performs the operation of subtraction between the first current signal and the second current signal, thereby an output current is generated in accordance with the input voltage.

Abstract: A voltage-to-current conversion circuit composed of MOSFETs of the same polarity and an OTA with Rail-to-Rail with a simple configuration that uses the same have been disclosed. The voltage-to-current conversion circuit comprises a first MOSFET, to which a fixed drain-source voltage is applied all the time, and which generates a first current signal for an input voltage, a second MOSFET, which has the same polarity as that of the first MOSFET, to which the fixed drain-source voltage is applied all the time, and which generates a second current signal complementary to the first current signal for the input voltage, and a difference current operation circuit that performs the operation of subtraction between the first current signal and the second current signal, thereby an output current is generated in accordance with the input voltage.

Abstract: When an input signal to be amplified is very small and a large blocking signal having a high frequency is included in an input, it is necessary for a filter for mobile communication for removing thereof that a common-mode signal rejection ratio is large. Further, even in the case of an amplifier having a high gain, it is preferable that the common-mode rejection ratio is large in order to avoid saturation of the amplifier by noise. A common-mode rejecting characteristic is added to an input stage by making transconductance circuits of an input of an integrating circuit proposed by Nauta differential circuits and connecting thereof in cross connection. Thereby, a filter as well as an amplifier improving the common-mode rejection ratio of a total, are realized by being applied to a CMOS process or a BiCMOS process.

Abstract: When an input signal to be amplified is very small and a large blocking signal having a high frequency is included in an input, it is necessary for a filter for mobile communication for removing thereof that a common-mode signal rejection ratio is large. Further, even in the case of an amplifier having a high gain, it is preferable that the common-mode rejection ratio is large in order to avoid saturation of the amplifier by noise. A common-mode rejecting characteristic is added to an input stage by making transconductance circuits of an input of an integrating circuit proposed by Nauta differential circits and connecting thereof in cross connection. Thereby, a filter as well as an amplifier improving the common-mode rejection ratio of a total, are realized by being applied to a CMOS process or a BiCMOS process.

Abstract: A semiconductor integrated circuit comprises an amplifier circuit including a current output amplifier, a load resistor having one end connected to an output terminal of the current output amplifier and a voltage control circuit having an input terminal connected to the one end of the load resistor and an output terminal connected to an other end of the load resistor. The input terminal of the amplifier circuit serves as an input terminal of the current output amplifier, and the output terminals of the amplifier circuit serve as the individual ends of the load resistor.

Abstract: A semiconductor integrated circuit comprises an amplifier circuit including a current output amplifier, a load resistor having one end connected to an output terminal of the current output amplifier and a voltage control circuit having an input terminal connected to the one end of the load resistor and an output terminal connected to an other end of the load resistor. The input terminal of the amplifier circuit serves as an input terminal of the current output amplifier, and the output terminals of the amplifier circuit serve as the individual ends of the load resistor.

Abstract: By reverse biasing the PN junction formed around a semiconductor element, the semiconductor element is isolated from other elements. The PN junction around the semiconductor element is a junction between a layer surrounding the semiconductor element and a layer disposed outside the layer. Jointly with the layer constituting the semiconductor, the layer surrounding the semiconductor element forms a parasitic diode. The potential of the layer on the semiconductor element to be connected to the layer surrounding the semiconductor element is detected, and based on this potential, the voltage to be applied to the parasitic diode is controlled so as to be constant. When the voltage to be applied to the parasitic diode is lower than a threshold, the parasitic diode will be in a cutoff state.

Abstract: A cryogenic refrigerator comprises a compressor including a compressor housing within which a cylinder is mounted, and a piston reciprocal within the cylinder, and a cold finger including a low temperature cylinder within which a displacer is reciprocable, and a regenerater mounted within the displacer. A plurality of flat piston suspension springs include a plurality of spiral slits to provide a plurality of spiral arms deflectable as the piston is reciprocated within the compressor cylinder. A plurality of annular inner retainers are secured to the piston and adapted to sandwich the inner peripheral edges of the piston suspension springs. A plurality of annular outer retainers are secured to the compressor housing and include a plurality of projections extending inwardly from the outer ends of the spiral slits to sandwich the outer peripheral edges of the flat piston suspension springs.

Abstract: A refrigerator comprising a first cylinder and a second cylinder which are coaxially arranged, a first movable coil and a second movable coil which are oppositely arranged in a magnetic flux produced by a magnet, and which can be reciprocated by applying an a.c.

Abstract: A refrigerator comprises a compressor including a first cylinder having an inner cylindrical surface, a piston reciprocating in the first cylinder, and a linear motor for having a.c. electric input power applied thereto to drive the piston; a cold finger including a second cylinder having an elongated inner cylindrical surface, a displacer reciprocating in the second cylinder, and a cold space and a hot space which are divided by the displacer; a temperature detector for detecting the temperature in the cold space; an electric input power decision unit for having a detection signal inputted from the temperature detector and for deciding the electric input power to be applied to the linear motor so that the electric input power grows greater and greater as the temperature in the cold space decreases; and a power source for providing the electric input power to the linear motor based on the output from the electric input power decision unit.