Abstract:
A tuner circuit includes a first IF signal generating a first oscillation signal, a local oscillator circuit outputting a local oscillator signal, a mixing circuit mixing the first IF signal and the oscillation signal to generate a second IF signal, and a first substrate on which at least the local oscillator signal is formed. The local oscillator circuit includes an oscillation circuit and a coaxial resonator connected to the oscillation circuit for correcting the influence of change in oscillation frequency owing to moisture and secular change. The coaxial resonator includes an impedance variable trimmer portion for adjusting the oscillation frequency, a central conductor provided at a fixed position with respect to the first substrate, and an insulator for providing insulation between the impedance variable trimmer and the central conductor. The impedance variable trimmer portion and the central conductor are adhered to one another via the insulator after adjusting is completed.
Abstract:
An integrated, tunable inductance network features a number of fixed inductors fabricated on a common substrate along with a switching network made up of a number of micro-electromechanical (MEM) switches. The switches selectably interconnect the inductors to form an inductance network having a particular inductance value, which can be set with a high degree of precision when the inductors are configured appropriately. The preferred MEM switches introduce a very small amount of resistance, and the inductance network can thus have a high Q. The MEM switches and inductors can be integrated using common processing steps, reducing parasitic capacitance problems associated with wire bonds and prior art switches, increasing reliability, and reducing the space, weight and power requirements of prior art designs. The precisely tunable high-Q inductance network has wide applicability, such as in a resonant circuit which provides a narrow bandwidth frequency response which peaks at a specific predetermined frequency, making possible a highly selective performance low noise amplifier (LNA), or in an oscillator circuit so that a precise frequency of oscillation can be generated and changed as needed.
Abstract:
In a voltage controlled oscillator, a dielectric resonator is mounted on a circuit board and a metal case is mounted on the circuit board to shield the dielectric resonator. The dielectric resonator comprises a C-shaped first electrode which is provided in a dielectric body, second and third electrodes which are arranged on upper and lower sides of the first electrode, a signal connecting pattern which is extended from the first electrode toward a side surface of the dielectric body, and earth connecting patterns which are extended from the first, second and third electrodes toward the side surface of the dielectric body, to provide predetermined impedance between the earth connecting pattern and the signal connecting pattern. The dielectric resonator is arranged with the second and third electrodes in parallel with a major surface of the circuit board, and the second electrode is upwardly exposed. A portion of the second electrode portion at a predetermined position is adapted to be trimmed so as to regulate the resonance frequency of the dielectric resonator, so as to regulate the oscillator frequency of the voltage controlled oscillator. The dielectric resonator can be miniaturized with no reduction of its Q-value.
Abstract:
A resonator (5) for a high frequency electric oscillator is disclosed. The resonator is an integrated capacitor and inductor. The capacitance (9) and inductance (10) of the resonator are continuously and simultaneously adjustable (26). The resonator includes a coaxial portion and a conductor portion. The coaxial portion has an inner dielectric (13) with a longitudinal aperture (14) and an outer conductive sheath or outer conductor (12). The conductor portion has a straight section (18) slidable in the aperture (14) and a V-shaped bent or oblique section (10).
Abstract:
A voltage controlled oscillator comprises a resonator for generating an oscillation signal, a frequency of which is in response to a control voltage; a transistor for amplifying the oscillation signal; oscillation frequency adjusting element for adjusting the frequency of the oscillation signal; and voltage control sensitivity adjusting element for adjusting a voltage control sensitivity of the oscillation signal.
Abstract:
A coin validator tests a coin using a pair of coils coupled in an oscillator circuit which is arranged to drive both the coils concurrently at two separate frequencies without interference therebetween, each frequency signal being influenced by the presence of a coin. Preferably, the coils are connected in series in a feedback loop to form a first oscillator, and the second oscillator is coupled to the interconnection between the coils the other ends of which are effectively short circuited at the frequency of the second oscillator.
Abstract:
Un circuit convertisseur amélioré (10) de conversion de la réactance inductive en fréquence permet de produire un signal de sortie dont la fréquence varie en réponse à une inductance ou réactance inductive d'entrée variable (30). Ce circuit de conversion amélioré comprend un moyen de gain différentiel (42) et un circuit résonnant amélioré (20) dont la fréquence de résonnance détermine la fréquence du signal de sortie. Le circuit résonnant amélioré (20) comprend un élément de capacitance (60, 62) et un transformateur (64) dont l'enroulement primaire (70) peut être connecté à la réactance inductive d'entrée variable (30) et dont l'enroulement secondaire (68) est connecté en parallèle à l'élément capacitif (60, 62) pour permettre de mesurer des changements relativement petits dans la réactance inductive d'entrée variable (30) comme des changements relativement grands de la fréquence de résonnance du circuit résonnant (20).
Abstract:
PROBLEM TO BE SOLVED: To increase the variation of inductance while preventing increase of series resistance in a variable inductor. SOLUTION: This variable inductor includes: a first inductor having both ends connected to a first terminal and a second terminal; a second inductor having both ends connected to the first terminal and the second terminal; a first node formed on the first inductor; a second node arranged on the second inductor; and a switch element for bringing the first node and the second node into a conduction state to each other or into a non-conduction state from each other. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
A coin validator tests a coin using a pair of coils coupled in an oscillator circuit which is arranged to drive both the coils concurrently at two separate frequencies without interference therebetween, each frequency signal being influenced by the presence of a coin. Preferably, the coils are connected in series in a feedback loop to form a first oscillator, and the second oscillator is coupled to the interconnection between the coils the other ends of which are effectively short circuited at the frequency of the second oscillator.