[특허]Bandgap voltage reference including a process and temperature insensitive start-up circuit and power-down capability

[미국특허] Bandgap voltage reference including a process and temperature insensitive start-up circuit and power-down capability 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G05F-003/16
출원번호	US-0248218 (1988-09-22)
발명자 / 주소	Bitting Ricky F. (Fort Collins CO)
출원인 / 주소	NCR Corporation (Dayton OH 02)
인용정보	피인용 횟수 : 56 인용 특허 : 4

초록 ▼

A bandgap voltage reference start-up circuit configured to initiate bandgap reference operation over an extended temperature range while being relatively insensitive to the effects of fabrication process variables. The circuit as preferably implemented includes a differential amplifier in the bandgap voltage reference stage which controls the source of current to contrasted bipolar devices situated in parallel paths. A comparator monitors the activities of the current source drive signal and compares that to an internally generated reference, which reference is configured to the matched in temperature and process variable effect the corresponding bandgap reference bipolar device and the current source device. During start-up the comparator initiates an injection of current into one bipolar device of the bandgap reference circuit to drive the bandgap loop into the appropriate of two potential operating states. The preferred embodiment also includes a power-down mode capability.

대표청구항 ▼

A bandgap reference circuit with reliable start-up comprising: a first path for current flow having a first bipolar transistor connected in electrical series with a first resistive element; a second path for current flow having a second bipolar transistor, of materially different emitter electrode area than the first transistor, connected in electrical series with a second resistive element; a node defined by the common connection of the base electrodes of the first and second bipolar transistors and a bipolar transistor collector electrode; means for detecting differences in the magnitudes of the currents flowing in the first and second paths, and providing an output signal proportional thereto; means for regulating the current flow through the first and second paths responsive to the output signals from the means for detecting; a third path for current flow having a third bipolar transistor, of similar emitter electrode area to that of the first bipolar transistor, connected in electrical series with a load element; means for detecting a current flow in the third path, for detecting the enablement state of the means for regulating, and for injecting current into the first path bipolar transistor upon coincidence of a current flow in the third path and a disabled state in the means for regulating.

이 특허에 인용된 특허 (4)

Monticelli Dennis M. (Fremont CA), CMOS DBE bias current generator.
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Kerth Donald A. (Reading-Comru Township ; Berks County PA) Sooch Navdeep S. (Emmaus PA), Cascode CMOS bandgap reference.

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Ahmed ; Adel Abdel Aziz, Self-starting amplifier circuit.

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Gemmell Robert M. (Carrollton TX) Hildebrand David B. (Bedford TX), Temperature compensated reference circuit.

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이 특허를 인용한 특허 (56)

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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

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[미국특허] Bandgap voltage reference including a process and temperature insensitive start-up circuit and power-down capability 원문보기