Capacitive digital-to-analog converter reset in an implantable medical device analog-to-digital converter
US7479910B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2007 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | Sep 26, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/39
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In general, this disclosure describes techniques for capacitive digit-to-analog converter (CAPDAC) resetting in an implantable medical device (IMD) analog-to-digital converter (ADC). The CAPDAC of an IMD ADC may occasionally be reset to increase the accuracy of its output. The output of the CAPDAC may be disconnected from a negative feedback input of an integrator and connected to a pseudo load during the reset. Disconnecting the CAPDAC from the negative feedback input of the integrator reduces the affect of the reset on the integrator. During the reset of the CAPDAC, the negative feedback input of integrator is coupled to a sample and hold capacitor, which temporarily provides an input approximately equal to a previous, e.g., immediate, value of the output of CAPDAC prior to the reset. Thus, the resetting of the CAPDAC is done in such a manner that the affect of the reset on integrator is substantially reduced or eliminated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.