Patent · US Active

Startup circuit

US9035641B1 · kind B1 · utility

1Cited by

2References

20Claims

0Family size

Assignee

Altera Corporation · US

Inventors

Thien Le · Santa Clara, US
Ping-Chen Liu · Fremont, US

Key dates

Filing date	Jun 6, 2011
Grant date	May 19, 2015
Priority date	—
Expiry date	Jan 3, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG05F3/16
WIPO fieldControl
WIPO sectorInstruments

Abstract

A startup circuit to ensure a bandgap reference circuit reliably starts up or recovers from a noise disturbance is provided. The startup circuit incorporates a pull down resistor to detect the bandgap reference circuit being in a disabled state. The startup circuit creates a positive feedback loop to force the bandgap reference circuit out of a disabled state. Consequently, whenever the power supply for the bandgap reference circuit sags or if bandgap output collapses, the output of the bandgap circuit reliably ramps back up to the expected level.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.