Sampling
First Claim
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1. Current-mode circuitry for sampling a current signal, the circuitry comprising:
- a first node configured to receive the current signal;
a plurality of second nodes conductively connectable to the first node along respective paths;
a steering circuit configured to control connections between the first node and the second nodes so that different packets of charge making up the current signal are steered along different ones of the paths over time; and
a reset circuit coupled to one of the second nodes, and configured, during a period between successive packets of charge for the one of the second nodes, to bring a voltage potential of the one of the second nodes to a first value.
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Abstract
There is disclosed current-mode time-interleaved sampling circuitry configured to be driven by substantially sinusoidal clock signals. Such circuitry may be incorporated in ADC circuitry, for example as integrated circuitry on an IC chip. The disclosed circuitry is capable of calibrating itself without being taken off-line.
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Citations
24 Claims
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1. Current-mode circuitry for sampling a current signal, the circuitry comprising:
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a first node configured to receive the current signal; a plurality of second nodes conductively connectable to the first node along respective paths; a steering circuit configured to control connections between the first node and the second nodes so that different packets of charge making up the current signal are steered along different ones of the paths over time; and a reset circuit coupled to one of the second nodes, and configured, during a period between successive packets of charge for the one of the second nodes, to bring a voltage potential of the one of the second nodes to a first value. - View Dependent Claims (2, 3)
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4. Current-mode circuitry for sampling first and second current signals that are complementary to each other, the circuitry comprising:
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first and second circuits that are complementary to each other, the first circuit configured to sample the first current signal, the second circuit configured to sample the second current signal, wherein each of the first and second circuits includes; a first node configured to receive the current signal for the one of the first and second circuits concerned; a plurality of second nodes conductively connectable to the first node along respective paths; and a steering circuit configured to control connections between the first node and the second nodes so that different packets of charge making up the current signal are steered along different ones of the paths over time; and wherein the circuitry includes; a reset circuit coupled to at least one of the second nodes of the first circuit and a complementary node of the second circuit, the complementary node being complementary to the at least one of the second nodes of the first circuit, and configured, during a period between successive packets of charge for a pair of the at least one of the second nodes of the first circuit and the complementary node of the second circuit, to bring a difference in voltage potential between the nodes of the pair to a second value. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. Current-mode circuitry for sampling first and second current signals that are complementary to each other, the circuitry comprising:
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first and second circuits that are complementary to each other, the first circuit configured to sample the first current signal, the second circuit configured to sample the second current signal, wherein each of the first and second circuits includes; a root node configured to receive the current signal for the one of the first and second circuits concerned; a plurality of first-tier nodes conductively connectable directly to the root node; a plurality of subsequent-tier nodes for each of the first-tier nodes, each of the subsequent-tier nodes being conductively connectable indirectly to the root node along a respective path via the corresponding first-tier node; and a steering circuit configured to control connections between the root node and the subsequent-tier nodes so that different packets of charge making up the current signal are steered along different ones of the paths over time; and a reset circuit coupled to at least one of the first and subsequent-tier nodes of the first circuit and a complementary node of the second circuit, the complementary node being complementary to the at least one of the first and subsequent-tier nodes of the first circuit, and configured, during a period between successive packets of charge for a pair of the at least one of the first and subsequent-tier nodes of the first circuit and a complementary node of the second circuit, to bring a difference in voltage potential between the nodes of the pair to a third value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of sampling a current signal in current-mode circuitry, the circuitry having a first node configured to receive the current signal and a plurality of second nodes conductively connectable to the first node along respective paths, the method comprising:
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controlling such connections between the first node and the second nodes so that different packets of charge making up the current signal are steered along different ones of the paths over time; and bringing, during a period between successive packets of charge for one of the second nodes, a voltage potential of the one of the second nodes to a fourth value.
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23. A method of sampling first and second current signals that are complementary to each other in current-mode circuitry, the circuitry having first and second circuits that are complementary to each other, the first circuit configured to sample the first current signal, the second circuit configured to sample the second current signal,
wherein each of the first and second circuits includes a first node configured to receive the current signal for the one of the first and second circuits concerned and a plurality of second nodes conductively connectable to the first node along respective paths, the method comprising: -
for each of the first and second circuits, controlling connections between the first node and the second nodes so that different packets of charge making up the current signal are steered along different ones of the paths over time; and for at least one of the second nodes of the first circuit and a complementary node of the second circuit, the complementary node being complementary to the at least one of the second nodes of the first circuit, during a period between successive packets of charge for a pair of the at least one of the second nodes of the first circuit and the complementary node of the second circuit, bringing a difference in voltage potential between the nodes of the pair to a fifth value.
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24. A method of sampling first and second current signals that are complementary to each other in current-mode circuitry, the circuitry having first and second circuits that are complementary to each other, the first circuit configured to sample the first current signal, the second circuit configured to sample the second current signal,
wherein each of the first and second circuits includes a root node configured to receive the current signal for the one of the first and second circuits concerned, a plurality of first-tier nodes conductively connectable directly to the root node, and a plurality of subsequent-tier nodes for each of the first-tier nodes, each of the plurality of subsequent-tier nodes being conductively connectable indirectly to the root node along a respective path via the corresponding first-tier node, the method comprising: -
for each of the first and second circuits, controlling connections between the root node and the subsequent-tier nodes so that different packets of charge making up the current signal are steered along different ones of the paths over time; and for at least one of the first and subsequent-tier nodes of the first circuit and a complementary node of the second circuit, the complementary node being complementary to the at least one of the first and subsequent-tier nodes of the first circuit, during a period between successive packets of charge for a pair of the at least one of the first and subsequent-tier nodes of the first circuit and the complementary node of the second circuit, bringing a difference in voltage potential between the nodes of the pair to a sixth value.
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Specification