Supply voltage independent bandgap circuit
US9218014B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 2013 |
| Grant date | Dec 22, 2015 |
| Priority date | — |
| Expiry date | Feb 25, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/26
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
This application discusses apparatus and methods for reducing supply voltage induced band gap voltage variation. In an example, a method of compensating a reference voltage current source for supply voltage variation can include providing at least a portion if a reference current for establishing the reference voltage using a first output transistor coupled to the supply voltage, maintaining a constant voltage across the first output transistor using a second output transistor coupled between the first output transistor and an output node, modulating a compensation impedance between a first node and ground as the supply voltage varies, the first node located where the first output transistor is coupled to the second output transistor, and wherein the modulating includes modulating the compensation impedance to substantially equal an output impedance, the output impedance measured between an output node and an input for the supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.