Hitachi, Ltd.

Other

Ryouzou Yoshino

Takashi Suga

Yoshihiko Hayashi

Kenji Nagai

Kazuki Watanabe

Kouichi Uesaka

Norihisa Yamamoto

Hajime Kinota

Keiji Kamei

Tatsuya Nishihara

Keisuke Igarashi

Hiroshi Yoshigi

Tadashi Oonishi

Takehiro Ookawa

Shin Kanno

Koji Tsuru

Masahiro Sugiura

Hisanobu Dobashi

Shigeru Date

Kimiaki Andou

In a semiconductor integrated circuit device and a contactless electronic device, an AC voltage is applied to first and second input terminals. A rectification transistor having a drain (or collector) connected to a second input terminal and gate (or base) and drain (or collector) connected to each other through a first resistor supplies a rectified current between the first and second input terminals. A first voltage detector means produces a control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to a predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor. Such a power supply circuit is mounted in the contactless electronic device.

Semiconductor integrated circuit device and contactless electronic device

A semiconductor integrated circuit device is provided with an IC chip so as to prevent its circuits from malfunction when the IC chip is cracked. To detect chip cracks, a resistor R is disposed at the outer periphery of the area in which one wants to detect the chip crack. If the chip is cracked and the resistance value of the resistor R is changed, the resistance change is detected, thereby controlling internal signals such as the power on reset signal and stopping the whole operation of the circuit device so as to prevent the circuits from malfunction. Thus, the system security can also be improved.

Semiconductor integrated circuit device and IC card

A reader and/or writer apparatus having an antenna lying substantially in a plane for generating an electromagnetic field to supply power to an IC card and a conductor member to be disposed in a plane substantially parallel to the plane of the antenna, wherein the distance between the antenna and the conductor member is no greater than 20 mm. A power supplying system supplies power using electromagnetic waves from the reader and/or writer apparatus to the IC card. The IC card includes a circuit for converting the supplied power to a D.C. voltage and for supplying the D.C. voltage to an internal circuit of the IC card.

Reader and/or writer apparatus, power feeding system, and communication system

A semiconductor integrated circuit device and a contactless electronic device are provided with a power supply circuit producing a stable smooth voltage with high efficiency for stable operation of an inner circuit. An AC voltage is applied to first and second input terminals and a rectification transistor having drain (or collector) connected to second input terminal and gate (or base) and drain (or collector) connected to each other through resistor supplies a rectified current between the first and second input terminals. The first voltage detection means produces control voltage so that the rectified voltage obtained on the source (or emitter) side of the first rectification transistor is equal to the predetermined reference voltage. The first voltage controlled current source can produce current in accordance with the control voltage and supply the current to the first resistor means. Such power supply circuit is mounted in the contactless electronic device.

The present invention comprises a power transmission system, an IC card, and an information communication system using an IC card. In the power transmission system, power is transmitted by radio from the power transmission device to the IC card. In the IC card, the transmitted induced power is converted into a DC voltage, the transmitted induced power or a voltage corresponding to the induced power is detected, and a desired DC voltage to be suppled to the internal circuit is obtained in controlling resistance the detected induced power or the voltage corresponding to the induced power.

Power transmission system, IC card and information communication system using IC card

A semiconductor integrated circuit device provided with an IC chip so as to prevent its circuits from malfunction when the IC chip is cracked. To detect chip cracks, a resistor R is disposed at the outer periphery of the area which wants to detect the chip crack. If the chip is cracked and the resistance value of the resistor R is changed, the resistance change is detected, thereby controlling internal signals such as the power on reset signal and stopping the whole operation of the circuit device so as to prevent the circuits from malfunction. Thus, the system security can also be improved.

Power transmission system IC card and information communication system using IC card

A reader and/or writer apparatus, a power feeding system and a power feeding and communication transmission and/or reception system in a proximate wireless card system arranged so that power which satisfies the requirement of the Radio Law (500 &mgr;V/m at a distance of 3 m from the reader and/or writer apparatus) regarding the radiated electric field is supplied sufficiently from the reader and/or writer apparatus to the proximate wireless card (IC card). The reader and/or writer apparatus has a spirally shaped or coil-shaped antenna for generating electromagnetic fields both to supply operational power to an IC card and to perform transmission and/or reception of signals for communication to and/or from the IC card and a conductor member for forming a mirror image of the antenna on its back side.

IC card

An arrangement to realize the functions of a radio card system in which power is transmitted to perform data communication. According to such arrangement, a delay line and a clock regenerating circuit such as PLL circuit which are previously necessary for demodulation by PSK are not necessary, and thus functions of data communication are realized by minimum hardware construction, size, cost and power consumption. Further, in a data communication system in which electric power transmission using a signal of a frequency fp and digital data communication using a carrier wave of a frequency fs are performed by radio, fs and fp are in the relationship of fs=fp/N (where N is an integer) and a phase shift P when the phase of the carrier wave is modulated by PSK is (M.times.360.degree.)/N (where M, N are integers and P is preferably not equal to 180.degree.).

Growing community of inventors

Hadano, Japan

Ryouzou Yoshino