Constant current source with threshold voltage and channel length modulation compensation
US6906651B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2004 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Jan 16, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/04106
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A constant current source with threshold voltage and channel length modulation includes first, second, third, fourth and fifth MOS transistors. Each of the MOS transistors has gate, first and second terminals. The first terminal of the second MOS transistor is coupled to loading impedance, and its second terminal is coupled with the first terminal of the first MOS transistor. The gate terminal and first terminal of the third MOS transistor are together coupled to the gate terminal of the second MOS transistor, and its second terminal is coupled to the first terminal of the fourth MOS transistor. The gate terminal and first terminal of the fourth MOS transistor are coupled to the gate terminal of the first MOS transistor, and its second terminal is coupled to a first reference voltage. The gate terminal and second terminal of the fifth MOS transistor are respectively coupled to a second reference voltage and a third reference voltage, and its first terminal is coupled to the gate terminal and first terminal of the third MOS transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.