Abstract:
The output from a resonance circuit (60) coupled electromagnetically with an external communication device is rectified by a power supply circuit (62) and outputted. The output voltage V is monitored by a switch control circuit (61). After the output voltage V has exceeded a threshold level Vth1, a switch element SW is turned on/off and to determine the state of the switch element SW where the output voltage V increases furthermore. The switch element SW is held in the determined state and a power supply switch element PSW is turned on when the output voltage V increases furthermore. Thus, stacked noncontact IC cards (6) can perform data communication even if the noncontact IC cards (6) approach the communication unit.
Abstract:
A longitudinal mode resonator that includes a substrate and a bar that is suspended relative to the substrate. The bar is suspended such that it is free to expand and contract longitudinally in response to the application of an electric field across its thickness. The expansion and contraction of the bar achieves resonance in response to the field having a frequency substantially equal to the fundamental frequency of the bar.
Abstract:
A surface mount filter (10) has a device body with a plurality of terminations (20, 22) located thereon. The device body is constructed having a rigid insulative substrate (44) with a first conductive pattern having one or more first capacitor plates which is opposed by a second conductive layer defining second capacitor plates on a dielectric layer (54). One or more layers of insulative polymer (66, 68) are located above the dielectric layer (54) and have conductor channels in which conductive material is located which forms the coil of the inductor. A sealing cover (46) such as glass or a planar polymeric sheet is located above the polymer layers. The chip is preferably built by thin film technology which allows a considerable reduction in component or circuit size for a variety of LC filters, such as LPF, HPF, BPF, BRF, or combinations thereof as well as LC resonators.
Abstract:
An MCM including a resonator (24) made using conventional MCM fabrication techniques. The MCM's resonator is constructed with overlapping first (26) and second (28) spiral-shaped regions of metallic material separated by a layer of dielectric material (44). A via (38) disposed in the layer of dielectric material, couples the spiral-shaped regions of metallic material together, thereby utilizing self winding and internal capacitance to gain resonance at frequencies between 500MHz to 3GHz. The internal capacitance is increased by controlling the overlap between the first and second spiral-shaped regions of metallic materials. On a high-resistivity substrate, the monolithic resonator achieves a Q of at least 19 at approximately 900MHz and at least 24 at approximately 2GHz.
Abstract:
The method and system provide a digital compensation circuit for calibrating a sensor. The compensation circuit comprises an interface circuit for receiving data relating to a plurality of parameters, and a circuit coupled to the interface circuit for providing polynomial compensation of a temperature coefficient (TC). The polynomial compensation circuit further comprises a circuit for providing a first output. The first output is a first value multiplied with a digital temperature. An adder/accumulator (232'/234') is coupled to the first output circuit and the interface circuit to add a second value using the first output.
Abstract:
An electro-acoustic hybrid integrated circuit such as a voltage controlled oscillator wherein a semiconductor substrate (1) having an active element (3) is bonded through direct bonding to a surface acoustic wave resonator or a quartz oscillator (2) as an electro-acoustic element. This structure can be used for a high frequency circuit to be used for movable body communication or the like. The hybrid integrated circuit is small, light and has good productivity.
Abstract:
There is disclosed a trimming circuit for use in integrated circuits for adjusting a circuit parameter to a desired level. The trimming circuit includes an input terminal and a fuse coupled between the input terminal and a supply voltage. The fuse is convertible from a low resistance condition to an open circuit condition in response to a first voltage potential applied to the input. The trimming circuit also includes circuit means coupled to the input for causing the circuit parameter to be permanently adjusted in response to the fuse being converted to the open circuit condition and is also responsive to a second voltage potential applied to the input for causing the circuit parameter to be temporarily adjusted without the fuse being converted to the open circuit condition. With the application of the second voltage potential, the appropriateness of the circuit parameter adjustment may be determined before the fuse is converted to the open circuit condition and hence, before the circuit paramter is permanently adjusted.