Small current detector circuit and locator device using the same

Details Small current detector circuit and locator device using the same Small current detector circuit and locator device using the same

1996-10-09

1998-07-21

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 53, 327 96, 327563, G01R 1900

Patent

active

057839514

ABSTRACT:
Improved small current detector circuit and locator device each comprise a first and a second element in both of which a small current output occurs, a first and a second constant current generator circuit each generating a specified constant current, a first current mirror circuit which is supplied at the input with said output current occurring in said first element and said specified constant current generated from said first constant current generator circuit, and a second current mirror circuit which is supplied at the input with said output current occurring in said second element and said specified constant current generated from said second constant current generator circuit, and wherein either one of said first and second elements is disposed in a detecting portion and a current equal to the current from the output of either one of said first and second current mirror circuits is flowed to the output of the other current mirror circuit such that a detection output corresponding to the difference between said output currents from said first and second elements is drawn from said other current mirror circuit.

REFERENCES:
patent: 4649301 (1987-03-01), Van Tran
patent: 5552729 (1996-09-01), Deguchi

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