Sanyo Electric Co., Ltd.

Yasuhiro Kaizaki

Seiichi Banba

Hiroki Teraoka

Masatsugu Naka

Takuya Hamada

Junpei Ito

Daisuke Nishida

Kazuyuki Kawakami

In a battery pack (),a current loop between the positive and negative electrode plates of an electrode assembly passes points P, P, P, P, P, P, P, P, P, P, P, P, Pand Pin this order. A line that connects Pto Pintersects a line that connects Pto Pin the part where the loop passes a sealing plate (), which is arranged on the top of a battery unit (). The loop can be divided into loop parts Band B. The part Bis formed on the exterior side of the battery unit, and extends from the intersection A through a circuit board () back to the intersection A. The part Bis formed on the interior side of the battery unit relative to the intersection A. The current flows counterclockwise and clockwise in the parts Band B, respectively.

Battery pack

A first field effect transistor receives an unbalanced signal from an input terminal at the gate thereof, and outputs a balanced signal from the drain thereof. A second field effect transistor has the gate thereof connected to the drain of the first field effect transistor and outputs a balanced signal from the drain thereof. The sources of the first field effect transistor and the second field effect transistor are connected to the drain of a third field effect transistor serving as a current source. The drain of the second field effect transistor is connected to the gate of the first field effect transistor via a first resistor. A first output terminal is connected between the drain of the first field effect transistor and the first resistor, and a second output terminal is connected between the drain of the second field effect transistor and a second resistor. Balanced signals produced by conversion in the first field effect transistor and the second field effect transistor are output from the output terminals. The drain of the second field effect transistor is connected to the gate of the first field effect transistor via a feedback resistor.

Differential amplifier for balanced/unbalanced converter

A first circuit which is constituted by a thin film resistor is connected between the collector of a transistor and a power supply terminal, and a second circuit which is constituted by a semiconductor resistor is connected between the emitter of the transistor and a grounding terminal. The film thickness of a thin film resistor is set to not more than its skin depth at a frequency to be compensated for.

High frequency circuit with thin film resistor

Growing community of inventors

Hyogo, Japan

Yasuhiro Kaizaki