Bandgap reference based power-on detect circuit including a supr

Details Bandgap reference based power-on detect circuit including a supr Bandgap reference based power-on detect circuit including a supr

1996-08-23

1998-12-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327539, H03L 700

Patent

active

058523766

ABSTRACT:
A power-on detect circuit includes: a resistor divider having a first node, a second node coupled to ground, and a center tap; a bandgap circuit for providing a reference voltage; a differential amplifier having a first input for receiving the reference voltage, a second input coupled to the center tap of the bandgap reference voltage circuit, and an output for providing a power-on detect signal; and a suppression circuit for coupling the first node of the resistor divider to a source of supply voltage once the reference voltage substantially achieves a stable reference voltage level. The suppression circuit has an input for receiving a trigger voltage generated in the bandgap circuit, and an output coupled to the first node of the resistor divider. The suppression circuit includes: an input section having an input for receiving the trigger voltage, and an output; a switch coupled between the source of supply voltage and the first node of the resistor divider having a control node coupled to the output of the input section; and a capacitor coupled to the control node of the switch. Both the switch and the bandgap circuit are responsive to the power-on detect signal for further reducing power consumption.

REFERENCES:
patent: 5359552 (1994-10-01), Dhong et al.
patent: 5440254 (1995-08-01), Sundby
patent: 5477176 (1995-12-01), Chang et al.
patent: 5514951 (1996-05-01), Halim et al.
patent: 5530398 (1996-06-01), Shamlou et al.
patent: 5532576 (1996-07-01), MacRobbie et al.
patent: 5619156 (1997-04-01), Jandu

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