Sub-threshold low-power-resistor-less reference circuit
US10042379B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2018 |
| Grant date | Aug 7, 2018 |
| Priority date | — |
| Expiry date | Jan 11, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/262
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A sub-threshold low-power and resistor-less reference circuit which is related to the field of reference circuit technology of analog circuit includes a negative-temperature-coefficient voltage generating circuit, a positive-temperature-coefficient voltage generating circuit and a current balancing circuit. The negative-temperature-coefficient voltage generating circuit generates a negative-temperature-coefficient voltage VCTAT based on the negative-temperature voltage characteristic of base-emitter PN junction of the bipolar tsansistor. On the other hand, the positive-temperature-coefficient voltage generating circuit generates a positive-temperature-coefficient voltage VPTAT based on the positive-temperature voltage characteristic of the NMOS transistor operating in a sub-threshold region. The current balancing circuit is configured to eliminate the error current caused due to the difference of the current mirror when the two voltages with different temperature characteristics are superposed to output a reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.