Offset adjustment device, semiconductor device, display device, offset adjustment method, noise detection device, and noise detection method
US7659777B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2007 |
| Grant date | Feb 9, 2010 |
| Priority date | — |
| Expiry date | Aug 9, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45534
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In one embodiment of the present invention, an operational amplifier circuit, a switching element is closed and a switching element is opened. A latch circuit DL latches an output voltage of an operational amplifier and supplies a Q output corresponding to the output voltage. A control circuit supplies an offset adjustment signal to an offset adjustment input terminal OR of the operational amplifier, thereby adjusting an offset of the output voltage. The latch circuit DL latches again the output voltage thus adjusted and minutely adjusts the offset adjustment signal so as to adjust the remaining offset. Weighting is carried out in accordance with how many times latching has been carried out, and the offset of the output voltage of the operational amplifier is quantized, thereby obtaining a binary logical signal and storing the signal in the control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.