Sensor read out

Details Sensor read out Sensor read out

2005-08-02

2005-08-02

Lefkowitz, Edward (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C330S257000, C702S133000

Reexamination Certificate

active

06924649

ABSTRACT:
A circuit and a method to measure continuously the resistance of variable resistors in series as e.g. potentiometers within a sensor, used for e.g. a joystick, has been achieved. The voltage across said sensor comprising any number of variable resistors is stabilized. A constant current source is providing a minimum current through said sensor. A variable current source is used to zoom variations of current through the sensor caused by variations of resistance of the sensor. Said variable current is mirrored and by measuring the voltage across a shunt resistor the total resistance of the sensor is identified. Using ports between each of the resistors, voltages can be measured representing the resistance of each of the variable resistors using known equations of voltage dividers. Any number of variable resistors can be used in the circuit invented.

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patent: 6538503 (2003-03-01), Burt
patent: 6768318 (2004-07-01), Burt et al.
patent: 6801059 (2004-10-01), Lee

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