Phase-locked loops that share a loop filter
First Claim
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1. An integrated circuit die stack, comprising:
- a first and a second die connected to each other, each of the first and second dies comprising at least one phase-locked loop (PLL),wherein PLLs in the first and second dies share a common loop filter to form corresponding feedback loops.
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Abstract
A die stack of an integrated circuit includes a plurality of dies. Each die in the die stack includes a phase lock loop (PLL). The PLLs in each of the dies share a loop filter and other corresponding circuits.
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Citations
20 Claims
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1. An integrated circuit die stack, comprising:
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a first and a second die connected to each other, each of the first and second dies comprising at least one phase-locked loop (PLL), wherein PLLs in the first and second dies share a common loop filter to form corresponding feedback loops. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An integrated circuit die stack, comprising:
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a first die comprising at least one voltage controlled oscillator and divider; a second die comprising at least another voltage controlled oscillator and divider; a shared phase frequency detector; a shared charge pump; and a shared loop filter, wherein the first and second dies are electrically connected to each other; the at least one voltage controlled oscillator and the divider in the first die combine with the shared phase frequency detector, the shared charge pump, and the shared loop filter to form a PLL feedback loop; and the at least another voltage controlled oscillator and the divider in the second die combines with the shared phase frequency detector, the shared charge pump, and the shared loop filter to form another PLL feedback loop. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An integrated circuit die stack, comprising:
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a first die comprises at least one phase-locked loop (PLL); a second die comprises at least another PLL; and a shared loop filter with a plurality of programmable connection elements, wherein the first and second dies are electrically connected to each other; elements of the at least one PLL in the first die combine with the shared loop filter to form a PLL feedback loop; elements of the at least one PLL in the second die combine with the shared loop filter to form another PLL feedback loop; and the plurality of programmable connection elements are configured to activate one of the PLL feedback loops at a time. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification