Resistor-less accurate low voltage detect circuit and method...

Details Resistor-less accurate low voltage detect circuit and method... Resistor-less accurate low voltage detect circuit and method...

2004-12-22

2008-03-25

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S091500, C327S077000

Reexamination Certificate

active

07349190

ABSTRACT:
A low voltage detect circuit is provided herein for detecting when an external voltage (Vext) drops below a predetermined minimum voltage. In general, the low voltage detect circuit described herein may be configured to detect a low voltage condition based on a threshold voltage difference between a non-zero threshold transistor having a substantially non-zero threshold voltage, and a zero threshold transistor having a threshold voltage relatively close to zero. According to a particularly advantageous aspect of the invention, the low voltage detect circuit described herein comprises substantially no resistors or reference voltage generation circuits, and therefore, provides significant savings in both current and die area consumption without sacrificing accuracy. The low voltage detect circuit of the present invention is particularly useful in power regulators, such as those used in memory systems or devices.

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