Method and apparatus for output voltage temperature dependence adjustment of a low voltage band gap circuit
US6954059B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2003 |
| Grant date | Oct 11, 2005 |
| Priority date | — |
| Expiry date | Sep 18, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Adjustment of the temperature dependence of the output voltage of a band gap circuit is achieved by intentionally mismatching currents flowing through nodes coupled to the inputs of an amplifier. Each node is coupled to a bipolar junction transistor and a resistor, such that an output voltage of the band gap circuit varies due to the temperature dependence of currents through the bipolar junction transistors and the temperature dependence of currents flowing through the resistors. Networks of parallel metal oxide semiconductor transistors are coupled to each node, with one network including transistors that may be selectively switched into or out of the network to adjust the effective channel width for that network, thereby altering the ratio of effective channel widths and adjusting the temperature dependence of the band gap circuit's output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.