Instrumentation amplifier calibration method, system and apparatus
US8026761B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2010 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Oct 27, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45197
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Calibration of gain and/or offset of an instrumentation amplifier (INA) is accomplished by coupling an appropriate number of current sources, and/or current sinks, respectively, to first and/or second transconductance stage(s) of the INA. Gain and/or offset calibration of the INA may occur when requested by a user and/or the occurrence of an event(s). A voltage reference may be used in combination with a successive approximation register analog-to-digital converter in determining which ones of the current sources and sinks are coupled to the first and/or second transconductance stage(s) of the INA for gain and/or offset calibration thereof. After the gain and/or offset calibration of the INA is completed, the selection of the constant current sources and sinks used therefore may be stored in volatile or nonvolatile memory. Parity checking of the memory may be incorporated and if a parity error is detected, an auto-calibration of the INA may be initiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.