Supply voltage level detector

Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing

Reexamination Certificate

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Details

C327S077000, C327S081000, C327S088000

Reexamination Certificate

active

07466172

ABSTRACT:
Supply voltage level detectors are disclosed. The supply voltage level detector comprises a voltage source divider dividing a voltage source to generate a detection voltage, a bandgap reference voltage generator, a comparator comparing the detection voltage with a bandgap reference voltage generated by the bandgap reference voltage generator to determine if the voltage source is ready, a control circuit, and a forcing circuit. To ensure reliability of the comparison result, the control circuit disables the comparing device until the bandgap reference voltage is available. The forcing circuit is coupled to the output terminal of the comparing device and is controlled by the control circuit. When the comparing device is disabled, the forcing circuit forces the voltage level of the output terminal of the comparing device to a specific value indicating the voltage source is unready.

REFERENCES:
patent: 5867047 (1999-02-01), Kraus
patent: 6750683 (2004-06-01), McClure et al.
patent: 6803751 (2004-10-01), Messager
patent: 7242565 (2007-07-01), Yoshio
patent: 2002/0158673 (2002-10-01), McClure et al.
patent: 2003/0076077 (2003-04-01), Messager
patent: 2006/0104001 (2006-05-01), Yoshio
patent: 2008/0143395 (2008-06-01), Frulio et al.

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