Auto Zero Circuit for a Current Sense Amplifier
OwnerNeeraj Keskar, Tanner Tengberg +2inventors
InventorsNeeraj Keskar, Tanner Tengberg, Saurav Bandyopadhyay, Nilanjan Pal
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Abstract
An apparatus includes a current sense amplifier having an output. The current sense amplifier includes a resistor coupled to the output. The current sense amplifier is configured to produce a current through the resistor. An auto zero circuit has an input coupled to the output of the current sense amplifier. The auto zero circuit is configured to iteratively adjust a second current from the output of the current sense amplifier through the auto zero circuit based on a voltage across the resistor.
Claims20
An apparatus, comprising:
- a current sense amplifier having an output, the current sense amplifier including a resistor coupled to the output, the current sense amplifier configured to produce a current through the resistor;
- and
- an auto zero circuit having an input coupled to the output of the current sense amplifier, the auto zero circuit configured to iteratively adjust a second current from the output of the current sense amplifier through the auto zero circuit based on a voltage across the resistor.
An apparatus, comprising:
- a first current source circuit having a first terminal and a second terminal;
- a voltage-controlled current source circuit having a third terminal, a fourth terminal, and a control input, the third terminal coupled to the first terminal, and the fourth terminal coupled to the second terminal;
- and
- a charge pump circuit having an output coupled to the control input.
An apparatus, comprising:
- a first current source circuit having a first terminal and a second terminal;
- a digital-to-analog converter (DAC) having a third terminal, a fourth terminal, and a control input, the third terminal coupled to the first terminal, and the fourth terminal coupled to the second terminal;
- and
- a counter having an output coupled to the control input.
Dependencies are inferred from the claim text.