Power-on detect by measuring thermal voltage

Details Power-on detect by measuring thermal voltage Power-on detect by measuring thermal voltage

2008-07-22

2008-07-22

Richards, N. Drew (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S142000, C327S198000

Reexamination Certificate

active

11542323

ABSTRACT:
A power-on detection circuit is arranged to cooperate with a thermal-voltage generator to determine when predictable circuit operation is achieved. The power-on detection circuit includes a comparator circuit and an inverter circuit. A power-on reset (POR) signal is generated by the inverter circuit, which evaluate an output of the comparator circuit. The comparator circuit includes a differential pair arrangement that is imbalanced with a resistor. The differential pair in the comparator circuit is arranged to determine when the thermal voltage has reached a desired target level by evaluating two points within the thermal-voltage generator circuit. The comparator circuit can have a target level that is below 100% of full operation to improve reliability.

REFERENCES:
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patent: 7157947 (2007-01-01), Chansungsan et al.
patent: 2005/0277241 (2005-12-01), Watanabe et al.
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“LM27 SOT-23, ±3° C. Accurate, 120° C.-150° C. Factory Preset Thermostat,”National Semiconductor Corporation, www.national.com, Sep. 2006, pp. 1-9.

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