Apparatus and method for an active power-on reset current...

Details Apparatus and method for an active power-on reset current... Apparatus and method for an active power-on reset current...

2005-04-12

2005-04-12

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

Reexamination Certificate

active

06879194

ABSTRACT:
An active power-on reset (POR) current comparator circuit creates a POR signal for resetting logic devices and masking reference startup signals during the initial power supply ramp of an integrated circuit. The comparator circuit provides a logic level signal (i.e., the POR signal) that will actuate when a bias current is above a predetermined level as compared to another current. The predetermined level for the bias current is set by a ratio established between two resistance levels within the active POR current comparator circuit.

REFERENCES:
patent: 4697097 (1987-09-01), Rusznyak
patent: 5852376 (1998-12-01), Kraus
patent: 5883532 (1999-03-01), Bowers
patent: 5959477 (1999-09-01), Chung
patent: 6137324 (2000-10-01), Chung

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