Rohm Co., Ltd.

Yusuke Yoshii

Yuki Inoue

Hiroyuki Makimoto

Yoshihiro Ikefuji

Takeshi Seike

Kazuki Kawasaki

The present disclosure provides a semiconductor device capable of reducing wiring resistance by using a stripe wire. The semiconductor device includes: a source pad electrode formed on a second interlayer insulating layer; a plurality of source extraction electrodes extracted in a first direction from the source pad electrode; a drain pad electrode formed on the second interlayer insulating layer; and a plurality of drain extraction electrodes extracted in the first direction from the drain pad electrode. The source pad electrode and the plurality of source extraction electrodes are electrically connected to a plurality of source wires of stripe wire covered by the second interlayer insulating layer. The drain pad electrode and the plurality of drain extraction electrodes are electrically connected to a plurality of drain wires of the stripe wire. The plurality of drain extraction electrodes are engaged with the plurality of source extraction electrodes.

Semiconductor device

An operational amplifiercomprises transistors Qand Qforming an input stage, and input resistors Rand Rwhich form a filter together with parasitic capacitors Cand Caccompanying the transistors Qand Q. Resistance values R of the resistors Rand Rmay be set to R=1/(2&#x3c0;&#xb7;fc&#xb7;C), where C is the capacitance value of each of the parasitic capacitors Cand C, and fc is the target cutoff frequency of the filter. The operational amplifiermay also include a power supply resistor Rwhich forms a filter together with a parasitic capacitor Caccompanying a power supply line.

Operational amplifier

This power transmission apparatus transmits power to a power reception apparatus by means of a magnetic field resonance system by supplying an output AC voltage (V) of a class E amplifier to a power-transmission side resonance circuit (TT). Before the transmission of power, the output AC voltage (V) of the class E amplifier is divided, and a voltage obtained by the division is supplied to the power-transmission side resonance circuit (TT). A current amplitude detection value of a power-transmission side coil (T) at this time is obtained as an evaluation value, and whether to permit execution of power transmission is controlled on the basis of the evaluation value, through determination as to whether a foreign object is present or not.

Power transmission device and non-contact power feeding system for transmitting electric power to power reception device by magnetic resonance

A contactless communication medium, includes: a coil sensitive to a magnetic field; a rectifying circuit configured to rectify an alternating power energy generated in the coil; a smoothing circuit configured to smooth a rectified output outputted from the rectifying circuit to generate a DC voltage; an output terminal connected to the smoothing circuit; a voltage detecting circuit configured to compare an output voltage extracted from the output terminal with a reference voltage; a switch configured to operate in response to an output from the voltage detection circuit and to attenuate the alternating power energy generated in the coil when the output voltage reaches a predetermined value; and a load connected to the output terminal, wherein impedance of the load has a value such that the output voltage has a predetermined value when an effective value of the magnetic field applied to the coil is 12 A/m or more.

Contactless communication medium and electronic device using the same

As one example of the invention disclosed herein, a reference voltage generation circuit has: a first reference voltage source generating a first reference voltage; a second reference voltage source generating a second reference voltage having a temperature response different from that of the first reference voltage; a first comparator comparing the first and second reference voltages to generate a first comparison signal; and a selector selectively outputting one of the first and second reference voltages as a reference voltage according to the first comparison signal.

Growing community of inventors

Kyoto, Japan

Yusuke Yoshii