CURRENT SUBTRACTION CIRCUITRY
First Claim
1. Circuitry, comprising:
- a first current branch configured to convey a first current amount;
a second current branch configured to convey a second current amount, wherein the second current branch splits into first and second sub-branches; and
an amplifier circuit configured to force the first current amount through the first sub-branch such that the second sub-branch conveys an amount of current that is equal to the difference between the first and second current amounts.
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Accused Products
Abstract
An electronic device may include a sensing circuit and a current subtraction circuit. The sensing circuit may output first and second current signals. The current subtraction circuit may mirror the first and second current signals onto first and second current branches. The second current branch may be split into a first sub-path and a second sub-path. An amplifier may control the amount of current flowing through the second sub-path by forcing the current flowing through the first current branch and the current flowing through the first sub-path to be identical. Configured in this way, the current flowing through the second sub-path will be equal to the difference between the first and second current signals. The current flowing through the second sub-path may be optionally amplified using another current mirror.
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Citations
20 Claims
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1. Circuitry, comprising:
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a first current branch configured to convey a first current amount; a second current branch configured to convey a second current amount, wherein the second current branch splits into first and second sub-branches; and an amplifier circuit configured to force the first current amount through the first sub-branch such that the second sub-branch conveys an amount of current that is equal to the difference between the first and second current amounts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of operating current subtraction circuitry, the method comprising:
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conveying a first amount of current through a first current branch; conveying a second amount of current through a second current branch, wherein the second current branch splits into first and second current sub-branches; using an amplifier to force the first amount of current to flow through the first current sub-branch; and conveying an amount of current that is equal to the difference between the first and second amounts of current through the second current sub-branch. - View Dependent Claims (13, 14, 15)
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16. An electronic device, comprising:
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a sensing circuit configured to output a first current measurement and a second current measurement; and a current subtraction circuit configure to receive the first current measurement and the second current measurement from the sensing circuit, wherein the current subtraction circuit comprises; a first current branch, wherein the first current measurement is mirrored onto the first current branch; a second current branch, wherein the second current measurement is mirrored onto the second current branch, wherein the second current branch splits into a first current path and a second current path; and an amplifier that forces the amount of current flowing through the first current branch to be equal to the amount of current flowing through the first current path so that the amount of current flowing through the second current path is equal to the difference between the first and second current measurements. - View Dependent Claims (17, 18, 19, 20)
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Specification