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US 10,852,329 B2Granted
High precision current sensing using sense amplifier with digital AZ offset compensation
AssigneeMicrochip Technology Incorporated
InventorsMarija Fernandez, Philippe Deval
Life of this patent
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Abstract
A current sensing circuit includes a current sense amplifier and a correction circuit. The current sense amplifier has an offset voltage. The correction circuit is configured to evaluate the offset voltage of the current sense amplifier. The correction circuit is further configured to issue a correction signal to the current sense amplifier based upon the evaluated offset voltage. The correction signal is to adjust the offset voltage.
Claims20
A current sensing circuit, comprising:
- a current sense amplifier;
- and
- a correction circuit configured to:
- evaluate an offset voltage of the current sense amplifier;
- issue a correction signal to the current sense amplifier based upon the evaluated offset voltage;
- and
- use a comparator connected to the inputs of the sense amplifier to control a digital integrator configured to generate the correction signal.
4 more elements
A system, comprising:
- a current sense amplifier;
- and
- a correction circuit configured to:
- evaluate an offset voltage of the current sense amplifier;
- issue a correction signal to the current sense amplifier based upon the evaluated offset voltage;
- and
- use a comparator connected to the inputs of the sense amplifier to control a digital integrator configured to generate the correction signal.
4 more elements
A method of sensing current, comprising:
- operating a current sense amplifier;
- and
- with a correction circuit:
- evaluate an offset voltage of the current sense amplifier;
- issue a correction signal to the current sense amplifier based upon the evaluated offset voltage;
- and
- use a comparator connected to the inputs of the sense amplifier to control a digital integrator configured to generate the correction signal.
4 more elements
Dependencies are inferred from the claim text.