Low noise level shifting circuits and methods and systems using the same
US6946890B1 · kind B1 · utility
5Cited by
1References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2004 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Mar 20, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45946
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A driver circuit includes an operational amplifier having an input and an output coupled by a feedback element. A voltage level shifter generates a voltage drop from the operational amplifier output to the operational amplifier input with a current source transistor setting a current controlling the voltage drop across the feedback element. A chopper circuit shifts flicker noise generated by the current source transistor to a higher frequency spectrum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.