Abstract: An offline trim circuit includes one or more irreversible trim elements, such as fuses, for example, used for setting electrical parameters to desired values. Associated circuitry is employed to verify the effect of trimming, prior to permanently setting trim bit values, permitting the optimal definition of the trim bit sequence and completely eliminating guesswork from the trimming procedure.

Abstract: Disclosed is an input/output coupling structure for a dielectric waveguide resonator to be mounted on a printed circuit board, which comprises; a region defined in the printed circuit board and surrounded by a first conductive film formed on the front surface of the printed circuit board and connected to a microstrip line on the printed circuit board, a second conductive film formed on the back surface of the printed circuit board, and a conductive wall connecting the respective peripheries of the first and second conductive films; a first slot formed in the front surface of the region; and a second slot formed in a surface of the dielectric waveguide resonator which is disposed to be opposed to the region of the printed circuit board. The first and second slots are adapted to be disposed in opposed relation to one another.

Abstract: Disclosed is a constant voltage power supply, which comprises an error amplifier VEA including a transistor M3, and a transistor M4 having the same ratio between channel width and channel length as that of the transistor M3. The gate and source of the transistor M4 are connected to the gate of a transistor M3 to form a current mirror circuit in conjunction with the transistor M3. Further, the drain of the transistor M4 is connected with a transistor M5 adapted to be switched in response to an external control signal Sg. For example, when the transistor M5 is in ON state, any signal amplification function of the transistor M3 is vanished away, and the gain of the error amplifier VEA is lowered. The circuit configuration for changing the gain of the error amplifier VEA makes it possible to strike a balance between high-speed response characteristic in an active mode and operational stability in a sleep mode, and reduce a circuit area required for being formed on an integrated circuit.

Abstract: Disclosed is an input/output coupling structure for coupling a printed circuit board with a dielectric waveguide having a dielectric body and a conductive film covering the dielectric body. The coupling structure comprises a first conductive pattern formed on the bottom surface of the dielectric waveguide to serve as an input/output electrode, in such a manner as to be surrounded directly by an exposed portion of the dielectric body and further by the conductive film formed around the outer periphery of the exposed portion, a spacer having a surface made substantially entirely of a conductive material and a portion for defining a given space, and a second conductive pattern formed on a principal surface of the printed circuit board and electrically connected to the microstrip line.

Abstract: Disclosed is a variable output-type constant current source circuit capable of varying its output current in a stepwise manner without the complication in circuit configuration and the increase in size of a semiconductor circuit board for incorporating the circuit therein. The constant current source circuit comprises a first self-biasing type constant current circuit 3a configured such that transistors M1, M2 are operable to cooperatively supply a given voltage across a resistor RS to generate a stabilized current IR1. In order to vary the output current, the constant current source circuit includes a switching circuit 5 (transistor M5) connected in series to a series circuit connecting in series the transistor M1 and the resistor RS, and a second constant current circuit 4 connected in parallel to a series circuit connecting in series the transistor M1, the resistor RS and the transistor M5.

Abstract: Disclosed is a switching constant-current power supply system, comprising a feedback circuit 7 provided between a detector circuit 5 for generating a first feedback signal in proportion to a current flowing in a load 6, and a control circuit 4 for driving a first power converter circuit 3 which is provided on the input side of a second power converter circuit 10 to stabilize the load current. The feedback circuit 7 includes a signal hold section 8 for generating a second feedback signal. The feedback circuit 7 is operable to supply the first feedback signal to the control circuit 4 in a current supply period, and to supply the second feedback signal to the control circuit 4 in a current cutoff period. The second feedback signal has a signal value approximately equal to that of the first feedback signal appearing in the current supply period. The switching constant-current power supply system can stabilize the load current even under the condition that the load is repeatedly turned on/off.

Abstract: High voltage and low voltage switch mode circuits and methods serve to recover the charge stored on electro-luminescent lamp panels that would otherwise be dissipated during the discharge cycle of a drive circuit. The high voltage circuits and methods operate to transfer the charge to the high voltage rail, while the low voltage circuits and methods operate to transfer the charge to the source of low drive voltage.

Abstract: Disclosed is a waveguide-type dielectric filter, which comprises a dielectric block, a plurality of resonators formed in the dielectric block, and a coupling portion for adjusting the coupling between the adjacent resonators. The dielectric block includes a pair of dielectric substrates which are divided in the arranging direction of the resonators and joined together through joint surfaces thereof, and a slot formed between the joint surfaces. The slot defines a through-hole severing as the coupling portion between the adjacent resonators. The slot may be formed in each of the joint surfaces or may be formed in only one of the joint surfaces. The above dielectric filter may include input and output sections, and a conductive film may be formed between the joint surfaces to provide a coupling portion of the input or output section. The present invention can provide a waveguide-type dielectric filter capable of being readily produced without causing any problem of mechanical strength.

Abstract: Disclosed is an input/output coupling structure for a dielectric waveguide resonator to be mounted on a printed circuit board, which comprises; a region defined in the printed circuit board and surrounded by a first conductive film formed on the front surface of the printed circuit board and connected to a microstrip line on the printed circuit board, a second conductive film formed on the back surface of the printed circuit board, and a conductive wall connecting the respective peripheries of the first and second conductive films; a first slot formed in the front surface of the region; and a second slot formed in a surface of the dielectric waveguide resonator which is disposed to be opposed to the region of the printed circuit board. The first and second slots are adapted to be disposed in opposed relation to one another.

Abstract: Disclosed is a constant voltage power supply, which comprises an error amplifier VEA including a transistor M3, and a transistor M4 having the same ratio between channel width and channel length as that of the transistor M3. The gate and source of the transistor M4 are connected to the gate of a transistor M3 to form a current mirror circuit in conjunction with the transistor M3. Further, the drain of the transistor M4 is connected with a transistor M5 adapted to be switched in response to an external control signal Sg. For example, when the transistor M5 is in ON state, any signal amplification function of the transistor M3 is vanished away, and the gain of the error amplifier VEA is lowered. The circuit configuration for changing the gain of the error amplifier VEA makes it possible to strike a balance between high-speed response characteristic in an active mode and operational stability in a sleep mode, and reduce a circuit area required for being formed on an integrated circuit.

Abstract: The present invention provides a dielectric waveguide filter comprising a plurality of dielectric waveguide resonators in the form of rectangular parallelepiped-shaped blocks aligned as a single main body having opposite ends defined by respective the end blocks located thereat, and a pair of input and output electrodes provided in the end blocks, respectively. Each of the end blocks is formed with a protruding portion including a dielectric substance extended from that therein. A conductive strip line extending from the bottom surface of corresponding one of the end blocks to the edge region of the bottom surface of corresponding one of the protruding portions. The bottom surfaces have a region where the dielectric substance in contact with the both sides of the conductive strip line is exposed to outside. The conductive strip lines are coupled with micro-strip lines or co-planer lines on a printed circuit board having a given length to obtain an adequate matching between input and output signals.

Abstract: It is an object of the present invention to provide a solid-state image pickup device capable of preventing any output variation due to a threshold voltage variation, and preventing a dynamic range from being narrowed in conjunction with deterioration in outputs due to a lowered threshold voltage. The present invention provides improvements in type and connection of a reset transistor, a select transistor, and an amplifier transistor to achieve the above object. Specifically, the present invention provides a solid-state image pickup device comprising a first MOS transistor serving as a reset switch, a second MOS transistor serving as a select switch, a photodiode, and a third MOS transistor having a source connected in series with the photodiode.

Abstract: Circuits and methods employing the inherent capacitance of an electro-luminescent lamp in a resonant circuit to recover the energy otherwise lost in electro-luminescent lamp driver circuits to thereby increase the overall efficiency of such circuits and to lower the noise and increase the life of the electro-luminescent lamp itself.

Abstract: A circuit for parallel sensing of the current in a power FET includes a sense FET and a current conveyor circuit employing exclusively FET devices. All FET devices may be MOSFET devices or JFET devices. The sense FET and the power FET have their gate terminals connected together and their source terminals connected together. The current conveyor circuit includes a current mirror. One or more additional current mirrors may be employed. One or more of the additional current mirrors may be cascoded or have other circuit techniques applied to them, in order to enhance their performance, hence overall circuit current sense performance.

Abstract: The present invention provides a small dielectric filter suitable for use in a high frequency band equal to or higher than 3 GHz. an input/output electrode made up of island type of conductive film is formed on one surface of said dielectric located on each end portion; in each of said dielectrics located on each end respectively, an earth electrode is formed on almost of all remaining area of said surface so as to be isolated from said input/output electrode and is also formed on all of the other surfaces with an exception of connecting surfaces; in an intermediate dielectric, an earth electrode is formed on all surfaces other than the connecting surface; and a conductive film connected to the earth electrode is formed on a part of at least one of the connecting surfaces of the dielectrics to be connected. Three or more elements of resonators may be integrally formed on a dielectric block, and, in that case, a through-hole is formed between the resonators.

Abstract: A capacitive sensor device comprises a delay circuit comprising either a sense electrode made from a material of high resistance and covered with a dielectric film or a sense electrode covered with a dielectric film and a resistor connected to the sense electrode; a reference signal source for providing input to the delay circuit; and a detector circuit for detecting delay time of output signal which is derived from the delay circuit in response to the reference signal source, wherein delay time of a signal which is produced by placing an object under detection on the dielectric film is converted to voltage in the detector circuit.

Abstract: A small dielectric filter suitable for use in a high frequency band equal to or higher than 3 GHz. An input/output electrode made up of island type of conductive film is formed on one surface of the dielectric located on each end portion. In each of the dielectrics located on each end respectively, an earth electrode is formed on almost all of the remaining area of the one surface so as to be isolated from the input/output electrode and is also formed on all of the other surfaces with an exception of connecting surfaces. In an intermediate dielectric, an earth electrode is formed on all surfaces other than the connecting surface, and a conductive film connected to the earth electrode is formed on a part of at least one of the connecting surfaces of the dielectrics to be connected. Three or more elements of resonators may be integrally formed on a dielectric block, and, in that case, a through-hole is formed between the resonators.

Abstract: There is disclosed a semiconductor device, which allows the ripple rejection characteristics to be improved and the operating voltage to be reduced. The semiconductor device comprises a power supply circuit arranged between an input terminal and internal circuits so as to make a connection therebetween, said power supply circuit including a transistor Q41 for supplying each of the internal circuits with a drive voltage and another transistor Q44 for allowing a current to pass therethrough in response to a magnitude of a reference voltage supplied to a base thereof and a magnitude of the drive voltage supplied to an emitter thereof. A part of the circuit composed of transistors Q42, Q43 and a resistor R5 controls a current flowing through of the transistor Q41 based on the current that has passed though the transistor Q44, so that the drive voltage could be set to a value higher than the reference voltage approximately by a magnitude of a forward voltage between the base and the emitter of the transistor Q44.

Abstract: The present invention provides a dielectric waveguide filter comprising a plurality of dielectric waveguide resonators in the form of rectangular parallelepiped-shaped blocks aligned as a single main body having opposite ends defined by respective the end blocks located thereat, and a pair of input and output electrodes provided in the end blocks, respectively. Each of the end blocks is formed with a protruding portion including a dielectric substance extended from that therein. A conductive strip line extending from the bottom surface of corresponding one of the end blocks to the edge region of the bottom surface of corresponding one of the protruding portions. The bottom surfaces have a region where the dielectric substance in contact with the both sides of the conductive strip line is exposed to outside. The conductive strip lines are coupled with micro-strip lines or co-planer lines on a printed circuit board having a given length to obtain an adequate matching between input and output signals.

Abstract: Disclosed is an inventive diode which can reduce a stray capacity to improve various characteristics thereof, in which a dielectric layer, a conductive layer and a second dielectric layer are respectively formed by deposition in this order on an upper face of a semiconductor substrate excluding a central portion of an exposed surface of a P-type region. Then, an anode side electrode is formed extending from the exposed surface of the P-type region to the upper face of the second dielectric layer, and is electrically connected with the P-type region. Herein, the conductive layer is formed such that it is isolated from the electrode by the second dielectric layer, is connected with the semiconductor substrate upper face in a location where the dielectric layer has not been formed, and partially resides in a location sandwiched between the electrode and the semiconductor substrate.