Calibration circuit for calibrating an adjustable capacitance of an integrated circuit having a time constant depending on said capacitance
US7742893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2008 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Dec 14, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2210/043
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A calibration circuit calibrates an adjustable capacitance of a circuit having a time constant depending on the adjustable capacitance. The calibration circuit outputs a calibration signal carrying information for calibrating the capacitor and includes a calibration loop. The calibration circuit includes: a controllable capacitance unit suitable to receive a control signal and including at least one array of switched capacitors that can be activated by the control signal, the unit being such as to output a first signal characterized by a parameter depending on the amount of capacitance of the array activated by the control signal; a comparison unit suitable to receive the first signal to assess whether the parameter meets a preset condition and to output a comparison signal representative of the assessment result; a control and timing logic unit suitable to receive the comparison signal to change this control signal based on the comparison signal, characterized in that the first signal is a logic signal and the parameter is a time parameter of the first signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.