Abstract:
PROBLEM TO BE SOLVED: To obtain a resistor which has very small variations depending on the power and is suitable as a high-precision power resistor for electric current detection. SOLUTION: This high-precision power resistor which has small variations in resistance which depend on power, is equipped with a substrate, having a first flat surface and a second flat surface which face each other and respectively have a predetermined shape and a predetermined composition, and a first resistive foil, which is bonded to one of the flat surfaces with a bonding agent and has a low TCR of approximately 0.1 ppm/°C, to approximately 1 ppm/°C and a thickness of approximately 0.03 mils to approximately 0.7 mils. The first resistive foil is patterned so as to give the desired resistance. The modulus of elasticity of a substrate is set to, approximately 10×10 6 psi to approximately 100×10 6 psi, and the substrate thickness is set to approximately 0.5 mils to approximately 200 mils. The type of the resistive foil, pattern, and bonding agent, the bonding agent thickness, and the substrate should be selected so as to produce cumulative effects on the reduction of variations in the resistance due to the power. This invention is for a manufacturing method of high-precision power resistors. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide technology of forming a high frequency capacitor on a semiconductor substrate in order to package a bottom electrode element so that the inclination thereof is reduced, with regard to the packaging technology of the electronic component of a bottom electrode element.SOLUTION: The capacitor comprises a substrate 38 having a first principal surface and a second principal surface, a dielectric layer 48 which is laminated on the first principal surface of the substrate, a first electrode 44, and a second electrode 46. A passivation layer 34 is laminated on the first electrode and second electrode. A first opening is formed in the passivation layer on the first electrode, and a second opening is formed in the passivation layer on the second electrode. A first bottom electrode termination 14 is provided in the first opening, and a second bottom electrode termination 16 is provided in the second opening. A standoff 18 is provided between the first bottom electrode termination and second bottom electrode termination, and attached to the passivation layer so that it serves as a support of an electronic component at the time of packaging. Since there is a standoff, the element does not tilt.
Abstract:
PROBLEM TO BE SOLVED: To provide a chip resistor with sulfuration resistance.SOLUTION: The chip resistor according to the present invention comprises: an insulation substrate 11; an upper terminal electrode 12 formed on an upper face of the substrate using silver-based cermet; a resistance element 14 positioned between a bottom electrode 13 and the upper terminal electrode 12 and partially overlaid on them; an optional inner protective coating 15 completely or partially covering the resistance element 14; an outer protective coating 16 completely covering the inner protective coating 15 and partially covering the upper terminal electrode 12; a nickel plating layer 17 covering an end face of the substrate, the upper electrode 12 and the bottom electrode 13 and partially overlaid on the outer protective coating 16; and a finish plating layer 18 covering the nickel layer 17. The nickel layer 17 is overlaid on the outer protective coating 16, and so an edge of the outer protective coating 16 can be plated before a nickel plating process, so as to provide a sealing characteristic.
Abstract:
PROBLEM TO BE SOLVED: To provide an RF modem which has frequency agility, is simple to implement, and can be constructed at low cost and small size.SOLUTION: A bidirectional direct sequence spread spectrum half-duplex RF modem for transmitting and receiving analog and digital pulse modulation incorporates a SAW based correlator for performing the spreading and de-spreading functions in the transmitter and receiver. A programmable frequency synthesizer provides the frequency source for various signals in the modem including a local oscillator (LO), IF interrogating pulse and clock signals. An upconverter/downconverter provides frequency translation to a desired frequency band. Pulse gating and interrogating pulse shaping reduce the spectral side bands of a transmitted spread pulse. The RF modem operates as an analog or digital pulse transmitter and receiver and is applicable in data communication systems such as OOK, PWM and PPM.