Very precise resistance measurement

Details Very precise resistance measurement Very precise resistance measurement

2005-12-20

2005-12-20

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

C324S691000, C280S735000

Reexamination Certificate

active

06977510

ABSTRACT:
A circuit and a related method to measure very precisely the resistance Rm of a small resistor independent from process and temperature variations. This resistor may be the RON resistance of an external sensor or e.g. the resistance of a safety device as a squib. A constant current source provides a current IBIAS causing a voltage drop Vm at the resistor to be measured. Using a configuration of operational amplifiers and current mirrors, wherein one of the current mirrors has a gain of n, an output voltage VOUT is achieved, which is defined by VOUT=n×Rm×IBIAS. The gain n of a current mirror allows a very precise measurement of the resistance Rm of the resistor to be measured. The output voltage is finally converted from analog to digital values.

REFERENCES:
patent: 5506509 (1996-04-01), Susak
patent: 6133749 (2000-10-01), Hansen et al.
patent: 6498494 (2002-12-01), Belau et al.
patent: 0454012 (1991-10-01), None
patent: 0701928 (1996-03-01), None

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