[특허]Current attenuator useful in a very low leakage current measuring device

Current attenuator useful in a very low leakage current measuring device 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01R-019/165 G01R-031/02
출원번호	US-0855241 (1986-04-24)
발명자 / 주소	Malaviya Shashi D. (Hopewell Junction NY) Morris Daniel P. (Purchase NY)
출원인 / 주소	International Business Machines Corporation (Armonk NY 02)
인용정보	피인용 횟수 : 60 인용 특허 : 0

초록 ▼

An attenuator useful in measuring low level leakage currents is disclosed. The attenuator includes a plurality of current dividers coupled in cascade. Each current divider includes an input and two outputs between which the current entering the input is divided. The current exiting the last divider is significantly attenuated from that entering the attenuator. The attenuator output is coupled to the device under test and to one input of a differential amplifier. A known current is input to the differential amplifier and part is directed to the attenuator input and the other part to a current measuring device. The difference between the known current input to the differential amplifier and that measured is the current input to the attenuator. In the steady state, the current input to the differential amplifier from the current attenuator is about zero. Accordingly, the leakage current is equal to the known current entering the differential amplifier less the measured current divided by m, the attenuation provided by the attenuator.

대표청구항 ▼

An integrated circuit current attenuator for precisely attenuating a current input thereto comprising, in combination: a plurality of attenuator stages coupled in cascade, each stage comprising: a stage input terminal for receiving the current I input to said attenuator stage: current divider means comprising only low leakage active bipolar integrated circuit elements of the same conductivity type coupled to said input terminal to divide said current I entering into said input terminal into n equal current paths, where n is an integer greater than 2, each said current path passing through one of n intermediate output terminals from said current divider means; means coupling m of said intermediate output terminals to a stage output terminal where m is an integer greater than or equal to 1 and less than or equal to n-1; the stage input to the first of said plurality of cascade coupled attenuators comprises the input to said current attenuator and the stage input to each other stage is coupled to the stage output of the preceding stage; and the stage output of the last of said plurality of said cascade coupled attenuators comprises the output of the current attenuator. The current attenuator of claim 1 wherein each said current divider means comprises: a semiconductor element having at least one emitter coupled to said stage input terminal, at least one base and n collectors each comprising an intermediate output terminal, m of said collectors being coupled to said stage output terminal and said remaining collectors being coupled to said base.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
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연합인증

Current attenuator useful in a very low leakage current measuring device 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

이 특허를 인용한 특허 (60)

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연합인증

Current attenuator useful in a very low leakage current measuring device 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (60)

관련 콘텐츠

특허 원문 보기

IPC 상위 출원인

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