Level shifters, memory systems, and level shifting methods
First Claim
1. A level shifter comprising:
- an input configured to receive an input signal in a first voltage domain;
an output configured to output an output signal from the level shifter in a second voltage domain different than the first voltage domain;
a plurality of pull-down devices, and wherein one of the pull-down devices is directly coupled with the input and the output;
a plurality of cross-coupled devices coupled with the pull-down devices and configured to provide transitions in the output signal as a result of transitions in the input signal;
a plurality of current limiting devices coupled with the cross-coupled devices and configured to limit a flow of current from a source to the cross-coupled devices; and
a plurality of dynamic devices configured to selectively provide charging current from the source to the cross-coupled devices.
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0 Petitions
Accused Products
Abstract
Level shifters, memory systems, and level shifting methods are described. According to one arrangement, a level shifter includes an input configured to receive an input signal in a first voltage domain, an output configured to output an output signal from the level shifter in a second voltage domain different than the first voltage domain, a plurality of pull-down devices, and wherein one of the pull-down devices is coupled with the input and the output, a plurality of cross-coupled devices coupled with the pull-down devices and configured to provide transitions in the output signal as a result of transitions in the input signal, a plurality of current limiting devices coupled with the cross-coupled devices and configured to limit a flow of current from a source to the cross-coupled devices, and a plurality of dynamic devices configured to selectively provide charging current from the source to the cross-coupled devices.
8 Citations
33 Claims
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1. A level shifter comprising:
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an input configured to receive an input signal in a first voltage domain; an output configured to output an output signal from the level shifter in a second voltage domain different than the first voltage domain; a plurality of pull-down devices, and wherein one of the pull-down devices is directly coupled with the input and the output; a plurality of cross-coupled devices coupled with the pull-down devices and configured to provide transitions in the output signal as a result of transitions in the input signal; a plurality of current limiting devices coupled with the cross-coupled devices and configured to limit a flow of current from a source to the cross-coupled devices; and a plurality of dynamic devices configured to selectively provide charging current from the source to the cross-coupled devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A level shifter comprising:
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an input configured to receive an input signal in a first voltage domain; supply circuitry configured to provide electrical energy from a source to an output node; dynamic circuitry configured to provide electrical energy from the source to the output node during transitions in an output signal; and an output coupled with the output node and configured to output the output signal from the level shifter in a second voltage domain; and bias circuitry configured to apply bias signals to the supply circuitry to cause the supply circuitry to provide the electrical energy from the source to the output node during the transitions in the output signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A memory system comprising:
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level shifter circuitry comprising an input configured to receive an input signal in a first voltage domain, pull-up circuitry configured to selectively pull an output node to a high voltage level, pull-down circuitry configured to selectively pull the output node to a low voltage level, charging circuitry configured to provide a plurality of current signals in parallel to the output node to charge the output node following a transition in the input signal, and an output coupled with the output node and configured to output an output signal in a second voltage domain different than the first voltage domain from the level shifter circuitry; and memory circuitry coupled with the level shifter circuitry and configured to use the output signal to store digital data in a plurality of memory cells. - View Dependent Claims (21, 22, 23)
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24. A level shifting method comprising:
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receiving an input signal in a first voltage domain; generating an output signal in a second voltage domain different than the first voltage domain and comprising a plurality of transitions corresponding to transitions in the input signal, the generating comprising generating using electrical energy conducted via supply circuitry; using bias circuitry, biasing the supply circuitry to cause the supply circuitry to conduct the electrical energy used to generate the output signal; conducting electrical energy via dynamic circuitry to provide the transitions in the output signal as a result of the transitions in the input signal; and outputting the output signal in the second voltage domain different than the first voltage domain. - View Dependent Claims (25, 26, 27, 28)
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29. A level shifting method comprising:
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receiving an input signal at an input, the input signal being in a first voltage domain and having a plurality of transitions; charging an output node using electrical energy; outputting an output signal using electrical energy at the output node, the output signal being within a second voltage domain different than the first voltage domain and having a plurality of transitions corresponding to the transitions in the input signal; and wherein the charging comprises charging the output node using the electrical energy which is conducted via a plurality of parallel charging devices from a common source during the transitions in the output signal. - View Dependent Claims (30, 31, 32, 33)
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Specification