Curvature compensated band-gap design trimmable at a single temperature

Patent metadata

Field	Value
Publication number	US-8941369-B2
Application number	US-201213599776-A
Country	US
Kind code	B2
Filing date	Aug 30, 2012
Priority date	Mar 19, 2012
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

A band-gap reference circuit is compensated for temperature dependent curvature in its output. A voltage across a diode with a fixed current is subtracted from a voltage across a diode with a proportional to absolute temperature (PTAT) current. The resultant voltage is then magnified and added to a PTAT voltage and a diode's voltage that has a complementary-to-absolute temperature (CTAT) characteristic, resulting in a curvature corrected hand-gap voltage. This allows for the band-gap reference circuit to be trimmed at a single temperature. This allows the circuit to be made with only a single trimmable parameter, which, in the exemplary circuits, is a resistance value.

First claim

The invention claimed is:

1. A trimmable reference voltage circuit, comprising:
a first diode connected between a proportional to absolute temperature current source and ground;
a first resistance connected between the first diode and the proportional to absolute temperature current source;
a first op-amp having a first input connected to a node between the first resistance and the first diode, an output connected to the gate of a first transistor connected between a high volt…

Assignees

• Youssefi Behdad
• Sandisk Technologies Inc

Inventors

• Youssefi Behdad

Classifications

• G05F3/30 Primary

  Physics · mapped topic