Reference current generator with small temperature dependence
US6348832B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2000 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | Apr 17, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05F3/245
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The current generator circuitry for providing a reference current with small temperature dependence feature is disclosed. The circuitry comprises two PMOS transistors, two NMOS transistors, two diode, as well as two resistors. The first PMOS and NMOS transistors as well as the first diode are in series connected between a power reference and a potential reference. It flows with a primary current. The second PMOS transistor has a gate terminal connected to a gate of the first PMOS transistor thereto connect to a drain terminal of the second PMOS transistor. Furthermore, the second NMOS transistor has a gate terminal connected to a gate of the first NMOS transistor thereof connecting to a drain terminal of the first NMOS transistor. The second PMOS transistor, the second NMOS transistor, the second diode, the first resistor and the second resistor are in series connected between above power reference and the potential reference to flow a reference current. Worth to note, the first resistor has a small temperature coefficient and the second resistor has a large temperature coefficient so that the temperature coefficient of the resistance is close to a critical value, 3.33E-3. As a res…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.