Ramp generator and circuit pattern inspection apparatus using the same ramp generator
US7816955B2 · kind B2 · utility
3Cited by
20References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2008 |
| Grant date | Oct 19, 2010 |
| Priority date | — |
| Expiry date | Jul 4, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a ramp generator capable of appropriately setting a rise starting point of an output voltage of a ramp waveform and an output voltage at the time of stable output. A current adjustment unit including a differential pair of transistors and an amplifier constitute a feedback circuit. By controlling the charging/discharging of an integration capacitor by ON/OFF of a discharge current source connected to a common emitter terminal of the current adjustment unit, an output of the ramp waveform outputted from an output terminal disposed at the connection end of the integration capacitor is controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.