Low power intelligent current source for monitoring a high volta

Details Low power intelligent current source for monitoring a high volta Low power intelligent current source for monitoring a high volta

1994-09-19

1996-04-30

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 78, 327 80, H03K 524

Patent

active

055128491

ABSTRACT:
A low power integrated current source (ICS) for monitoring the voltage at an input terminal includes a current source and a network of current mirror circuits coupled to the current source, to the input terminal and to an output terminal. The circuit monitors the input voltage by comparing the input current with a reference current determined by the current source. The current mirror network responds to a predetermined voltage (current) at the input terminal to switch the output voltage at the output terminal from a first voltage level to a second voltage level. The ICS voltage monitor circuit limits the maximum value of the input current as the input voltage increases beyond a given voltage level thereby limiting the power dissipation. The trip voltage can be reset by merely changing the reference current supplied by the current source or by changing the value of an input resistor whose purpose is to convert the input voltage into an input current.

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