High precision analog to digital converter
First Claim
1. An analog to digital converter comprising:
- an input switch array configured to alternately sample a first and a second input signal to a first and a second input capacitor during two different sample time intervals;
an integrator having a first and second integration capacitor; and
a cross switch array coupled to said input switch array and said integrator, said cross switch array configured to alternately transfer charges from said first and second input capacitors to said first and second integration capacitors during two different transfer time intervals.
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Abstract
An analog to digital converter may include an input switch array configured to alternately sample a first and a second input signal to a first and a second input capacitor during two different sample time intervals, an integrator having a first and second integration capacitor, and a cross switch array coupled to the input switch array and the integrator. The cross switch array may be configured to alternately transfer charges from the first and second input capacitors to the first and second integration capacitors during two different transfer time intervals. A system including an analog to digital converter consistent with an embodiment and an associated method of sampling and transferring charges in an analog to digital converter are also provided.
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Citations
20 Claims
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1. An analog to digital converter comprising:
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an input switch array configured to alternately sample a first and a second input signal to a first and a second input capacitor during two different sample time intervals;
an integrator having a first and second integration capacitor; and
a cross switch array coupled to said input switch array and said integrator, said cross switch array configured to alternately transfer charges from said first and second input capacitors to said first and second integration capacitors during two different transfer time intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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a battery;
a sensor configured to sense a current to or from said battery and provide a first and second analog signal representative of said current;
an analog to digital converter configured to accept said first and second analog signals and provide a digital signal representative of a difference between said first and second analog signals, said analog to digital converter comprising;
an input switch array configured to alternately sample said first and second analog signals to a first and a second input capacitor during two different sample time intervals;
an integrator having a first and second integration capacitor; and
a cross switch array coupled to said input switch array and said integrator, said cross switch array configured to alternately transfer charges from said first and second input capacitors to said first and second integration capacitors during two different transfer time intervals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method comprising:
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alternately sampling a first and second input signal to a first and second input capacitor of an analog to digital converter during two different sampling time intervals; and
alternately transferring charges sampled during said two different sampling time intervals to a first and second integration capacitor of an integrator of said analog to digital converter during two different transfer time intervals. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification