Current Mode Analog-to-Digital Converter
First Claim
Patent Images
1. A current-mode analog to digital converter comprising:
- a current input node;
a current-mode sample and hold circuit configured to output an electrical current having an analog value proportional to a sampled analog value of an electrical current at the current input node; and
at least one current comparator configured to compare the electrical current output by the current-mode sample and hold circuit to at least one reference current to produce a digital representation of the sampled analog value of the electrical current at the current input node.
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Abstract
A current-mode analog-to-digital converter includes: a current input node; a current-mode sample and hold circuit configured to output a steady source of electrical current having an analog value proportional to a sampled analog value of an electrical current at the current input node; and at least one current comparator that compares the electrical current output by the current-mode sample and hold circuit to at least one reference current to produce a digital representation of the sampled analog value of the electrical current at the current input node.
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Citations
35 Claims
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1. A current-mode analog to digital converter comprising:
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a current input node; a current-mode sample and hold circuit configured to output an electrical current having an analog value proportional to a sampled analog value of an electrical current at the current input node; and at least one current comparator configured to compare the electrical current output by the current-mode sample and hold circuit to at least one reference current to produce a digital representation of the sampled analog value of the electrical current at the current input node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An analog-to-digital converter, comprising:
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a voltage-mode stage comprising circuitry that receives an input signal at a voltage input node, produces a digital representation of a sampled voltage of the input signal, produces a reconstruction voltage based on the digital construction of the sampled voltage, and outputs a first current representative of a difference between the reconstruction voltage and the sampled voltage of the input signal; and a current-mode stage comprising a current input node that receives the first electrical current output from the voltage-mode stage, a current-mode sample and hold circuit that outputs a second electrical current having an analog value proportional to a sampled analog value of an electrical current at the current input node, and at least one current comparator that compares the second electrical current output by the current-mode sample and hold circuit to at least one reference current to produce a digital representation of the sampled analog value of the electrical current at the current input node. - View Dependent Claims (16, 17)
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18. A system of measuring current, comprising:
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an analog to digital converter, said analog to digital converter comprising; a current input node; a current-mode sample and hold circuit configured to output a steady source of electrical current having an analog value proportional to a sampled analog value of an electrical current at the current input node; and at least one current comparator configured to compare the electrical current output by the current-mode sample and hold circuit to at least one reference current to produce a digital representation of the sampled analog value of the electrical current at the current input node on at least one digital output node; and an electrical switch in electrical communication with said current input node, wherein said switch is configured to selectively couple one of a plurality of current sources to said current input node; and an electrical switch in electrical communication with said current output node, wherein said switch is configured to selectively couple said current output node to one of a plurality of current drains. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. A method of obtaining a digital representation of an analog current signal, said method comprising:
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outputting from a current-mode sample and hold circuit an electrical current having an analog value proportional to a sampled analog value of an input electrical current; comparing the analog value of the electrical current output from the current-mode sample and hold circuit to at least one reference current using a current comparator; and outputting to a digital output node a digital result of the comparison of the analog value of the electrical current output from the current-mode sample and hold circuit to the at least one reference current. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification