Supply invariant bandgap reference system

US8536854B2 · kind B2 · utility

Assignee

• CIRRUS LOGIC, INC. · US

Inventors

• John L. Melanson · Austin, US
• Prashanth Drakshapalli · Austin, US
• Larry L. Harris · Austin, US

Key dates

• Filing date: Sep 30, 2010
• Grant date: Sep 17, 2013
• Expiry date: Sep 15, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G05F3/30
• WIPO field: Control
• WIPO sector: Instruments

Abstract

An electronic reference-signal generation system includes a supply invariant bandgap reference system that generates one or more bandgap reference signals that are substantially unaffected by bulk error currents. In at least one embodiment, the bandgap reference generates a substantially invariant bandgap reference signals for a range of direct current (DC) supply voltages. Additionally, in at least one embodiment, the bandgap reference system provides substantially invariant bandgap reference signals when the supply voltage varies due to alternating current (AC) voltages. In at least one embodiment, the bandgap reference system generates a bandgap reference voltage VBG, a “proportional to absolute temperature” (PTAT) current (“iPTAT”) and a “zero dependency on absolute temperature” (ZTAT) current (“iZTAT”) that are substantially unaffected by variations in the supply voltage and unaffected by a bulk error current.