Fujitsu Media Devices Limited

Fujitsu Corporation

Toshihiko Murata

Osamu Furukawa

Toshio Nishizawa

Shogo Inoue

Osamu Kawachi

Osamu Ikata

Seiichi Mitobe

Noriaki Taniguchi

A multimode type SAW filter includes a piezoelectric substrate, and IDT groups formed on the piezoelectric substrate, the IDT groups each having multiple IDTs connected in series in which an input/output electrode and a ground electrode are coupled via a floating conductor. Adjacent electrode fingers between adjacent IDTs among the multiple IDTs of the IDT groups include a first electrode finger connected to the floating conductor in one of the IDT groups and a second electrode finger connected to one of the input/output electrode and the ground electrode in another one of the IDT groups.

Surface acoustic wave filter and duplexer using the same

More compact, thinner, shorter and lighter surface-mounted electronic component modules and their manufacturing methods at low costs, thus making them industrially highly valuable are available. Such the component includes a wiring substrate having wiring patterns formed on one side and external connection terminals formed on the other side, the wiring patterns and the external connection terminals being connected with each other by via holes or through holes; a plurality of electronic component devices mounted on the one side of the wiring substrate; and an exterior resin layer formed on the wiring substrate which covers the plurality of electronic component devices, wherein at least one of the plurality of electronic component devices is fastened face up to the one side of the wiring substrate, the connection terminal of the electronic component device fastened face up and the wiring pattern or the connection terminal of another electronic component device being connected with each other by wire.

Surface-mounted electronic component module and method for manufacturing the same

A surface acoustic wave device having a given impedance includes multimode type filters connected in series. A composite impedance of the multimode type filters defines the given impedance of the surface acoustic wave device.

Surface acoustic wave device

The present invention permits further miniaturization and shortening of a surface acoustic wave device while avoiding the influence of the surface acoustic wave device on the inductance value and performance index (Q value) of the spiral inductor. The chip on which the spiral inductor is formed is flip-chip mounted in a package together with another surface acoustic wave device chip. The package is provided with a hermetically sealed lid. A conductor pattern is formed on a face of the package that opposes the spiral inductor. Further, the overlap between the region of the spiral inductor and the conductor pattern is 7% or less.

A phase locked loop having a charging pump circuit portion for generating a phase difference output voltage between an input signal and an oscillation output signal, and a semiconductor device including such a phase locked loop, are constituted so that the phase difference output signal from the charging pump circuit portion is inputted to a voltage controlled oscillator through a low-pass filter, and an oscillation frequency of the oscillation output signal from the voltage controlled oscillator is brought into conformity with a frequency of the input signal, and they further include voltage source means which is connected to a phase difference output terminal of the charging pump circuit portion during each period in which the phase difference output terminal of the charging pump circuit portion is in a non-conductive state, and supplies a voltage having a potential substantially equal to the potential of the low-pass filter on the output side thereof.

Phase locked loop having a voltage source responsive to a filtered phase

In a phase synchronous circuit, a phase of a reference signal and a phase of a compared signal that corresponds to an oscillation signal output by an oscillator are compared with each other a phase comparison output signal which corresponds to a phase difference is fed to the oscillator via a filter so that the oscillator is controlled. A control circuit provided in the phase synchronous circuit causes an output value of the phase comparison output signal to vary nonlinearly in accordance with the phase difference.

Growing community of inventors

Yokohama, Japan

Toshihiko Murata