Power-on-reset generator using a voltage-shaping inverter chain

Details Power-on-reset generator using a voltage-shaping inverter chain Power-on-reset generator using a voltage-shaping inverter chain

2008-09-08

2011-10-11

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S143000, C327S205000, C327S206000

Reexamination Certificate

active

08035426

ABSTRACT:
This application discloses a device that has a power-on reset generator. The power-on reset generator can include a power-on detector that receives an input electrical signal and outputs a digital signal that has predetermined value when the voltage of the input electrical signal exceeds a threshold voltage. The power-on detector can include multiple voltage-shaping elements arranged in series. Each voltage-shaping element can have a P-channel transistor and an N-channel transistor that differs in strength with respect to the P-channel transistor. The power-on detector can also include a switch that locks the digital signal at the predetermined value when the voltage of the input electrical signal exceeds the voltage threshold. In addition to the power-on detector, the power-on reset generator can include a digital delay that receives both the digital signal and a clock signal. The power-on reset generator can wait a predetermined time delay after the digital signal reaches the predetermined value then de-assert the reset signal.

REFERENCES:
patent: 5184032 (1993-02-01), Leach
patent: 6204704 (2001-03-01), Williams et al.
patent: 7518419 (2009-04-01), Pasqualini
patent: 2004/0095171 (2004-05-01), Kang
patent: 2004/0169533 (2004-09-01), Hirano et al.
patent: 2006/0139071 (2006-06-01), Olsen
patent: 2008/0106309 (2008-05-01), Abe

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