Coulomb counter with offset calibration
This disclosure describes techniques for compensating for amplifier drift. An amplifier is configured to generate an output that triggers a charge counter to generate a charge count value based on a charge count signal. A current digital-to-analog converter (IDAC) is coupled to the amplifier and con...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | This disclosure describes techniques for compensating for amplifier drift. An amplifier is configured to generate an output that triggers a charge counter to generate a charge count value based on a charge count signal. A current digital-to-analog converter (IDAC) is coupled to the amplifier and configured to provide an offset current to a first input of the amplifier. An offset correction circuit is configured to: determine whether a duty cycle associated with the amplifier exceeds a specified threshold and generate a signal to cause the MAC to adjust the value of the offset current to compensate for amplifier drift based on determining whether the duty cycle exceeds the specified threshold. |
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