CURRENT MEASUREMENT CIRCUIT

Japanese Patent JP2004226095

A

To provide a current measuring circuit capable of measuring accurately and easily a current driven to a load corresponding to an applied voltage without exerting an influence on the load.

When a voltage is supplied from a voltage supply terminal 3 to a non-inverting input terminal of an operation amplifier 4, a voltage equal to the supplied voltage is inputted into an inverting input terminal, and inputted into a voltage application terminal 2 to the load 1. When PNP transistors Q1, Q2 constituting a current mirror are switched to the ON state in response to the applied voltage, a source current I1 flows into the load 1 through the PNP transistor Q1, and a mirror current I2 of the source current I1 flows into a current measuring terminal 8 through the PNP transistor Q2. The current I1 driven to the load 1 can be determined by measuring the mirror current I2 by an ammeter 6.

NISHINO ISAO
MORI SEIICHIRO

JP2003010980A

August 12, 2004

January 20, 2003

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MITSUBISHI ELECTRIC CORP

G01R19/00; H01L21/66; G01R31/26; G01R31/30; (IPC1-7): G01R31/26; G01R19/00; H01L21/66

Kuro Fukami
Toshio Morita
Yoshihei Nakamura
Yutaka Horii
Hisato Noda
Masayuki Sakai

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