Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1992-04-24
1994-10-18
Callahan, Timothy P.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
3072966, 3072968, 307491, 307494, H01L 3100, H03K 301, G06G 712
Patent
active
053571495
ABSTRACT:
A temperature sensor circuit with a differential output, a differential pair circuit and a feedback circuit. The differential pair circuit has a first MOS transistor whose gate is connected to an output terminal of the temperature sensor circuit and to a reference voltage and a second MOS transistor whose source is connected to the source of the first MOS transistor. The capacity ratios, or gate-width and gate-length ratios (W/L) of the first and second MOS transistors are different. The first and second MOS transistors have a load circuit connected to their drains and a constant current source connected to their sources. The output voltage of the differential pair circuit is connected to the other output terminal of the temperature sensor circuit, as well as to the gate of the second MOS transistor thereby feedback-controlling the differential pair circuit so that the drain currents of the first and second MOS translators are equal to each other. The load is a current mirror circuit, that has two MOS transistors whose gate-width and gate-length ratios are either different from or equal to each other.
REFERENCES:
patent: 4657658 (1987-04-01), Sibbald
patent: 4714901 (1987-12-01), Jain et al.
patent: 4994688 (1991-02-01), Horiguchi et al.
patent: 5157285 (1992-10-01), Allen
patent: 5200654 (1993-04-01), Archer
VITTOZ et al., "CMOS Analog Integrated Circuits Based on Weak Inversion Operation", IEEE Journal of Solid-State Circuits, vol. SC-12, No. 3, Jun. 1977, pp. 224-231.
VLSI Design Techniques for Analog and Digital Circuits, pp. 363, published by McGraw-Hill, 1990.
Callahan Timothy P.
NEC Corporation
Phan Trong
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