Reference voltage temperature coefficient calibration circuit and method
US9977111B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 2015 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Sep 28, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45166
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a reference voltage temperature coefficient calibration circuit. The circuit comprises: an operational amplifier comprising an input pair transistor, a load pair transistor, and a bias current source, an inverted input terminal of the operational amplifier being connected to an output terminal of the operational amplifier; and an adjustable current module connected in parallel to the load pair transistor, the adjustable current module being configured to generate an adjusting current, the adjusting current being used to adjust an offset current flowing through the input pair transistor, wherein the adjusting current is related to a current of the bias current source and an order of Kelvin temperature. The present invention is applicable to calibration of first-order to high-order temperature coefficients of a reference voltage in a circuit, and has universality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.