Current sensor using level shift circuit

Details Current sensor using level shift circuit Current sensor using level shift circuit

2006-07-31

2008-11-11

Nguyen, Vincent Q. (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

Reexamination Certificate

active

07449896

ABSTRACT:
A circuit for sensing a current includes a first upper resistor having a first end coupled to a first end of a sense resistor, the sense resistor being configured to receive an input current. A second upper resistor has a first end coupled to a second end of the sense resistor, so that the sense resistor defines a first potential between the first and second ends of the sense resistor. A first lower resistor is provided between the first upper resistor and the ground. A second lower resistor is provided between the second upper resistor and the ground. An amplifier has a first input node and a second input node, the first input node being coupled to a node between the first upper resistor and the first lower resistor. The second input node is coupled to a node between the to the second upper resistor and the second lower resistor. The first and second input nodes defines a second potential corresponding to the first potential.

REFERENCES:
patent: 5765949 (1998-06-01), Haddad et al.
patent: 6178514 (2001-01-01), Wood
patent: 7102335 (2006-09-01), Solie
patent: 2005/0073317 (2005-04-01), Yamamoto et al.

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