Programmable voltage divider and method for testing the impedanc

Details Programmable voltage divider and method for testing the impedanc Programmable voltage divider and method for testing the impedanc

1997-03-07

1999-09-14

Trammell, James P.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324550, 324765, 324 7611, 327525, 327527, 365201, G01R 1900, G11C 700

Patent

active

059528338

ABSTRACT:
A programmable voltage divider has normal and test modes of operation. The divider includes first and second supply nodes, a divider node that provides a data value, and a first divider element that is coupled between the first supply node and the divider node. The divider also includes a controlled node, a second divider element that has a selectable resistivity and that is coupled between the divider node and the controlled node, and a test circuit that is coupled between the controlled node and the second supply node. During the normal mode of operation, the first and second divider elements generate the data value having a first logic level when the second divider element has a first resistivity, and generate the data value having a second logic level when the second divider element has a second resistivity. The test circuit generates a first voltage at the controlled node during the normal mode of operation, and generates a second voltage at the controlled node during the test mode of operation. The test circuit may generate the first and second voltages by varying its impedance, or by switching in and out one or more fixed voltages.

REFERENCES:
patent: 4572971 (1986-02-01), Necoechea
patent: 4698589 (1987-10-01), Blankenship et al.
patent: 5539306 (1996-07-01), Riggio, Jr.
patent: 5654663 (1997-08-01), McClure et al.

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