Level Shifter, System-on-Chip Including the Same, and Multimedia Device Including the Same
First Claim
Patent Images
1. A level shifter, comprising:
- an input node;
first and second voltage shifter circuits configured to generate an output clock of a second voltage domain in response to an input clock of a first voltage domain input via the input node; and
an output node configured to output the output clock,wherein the first and second voltage shifter circuits have a same structure and are connected in parallel between the input node and an output node.
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Abstract
Disclosed is a level shifter that includes an input node; first and second voltage shifter circuits configured to generate an output clock of a second voltage domain in response to an input clock of a first voltage domain input via the input node, and an output node configured to output the output clock, wherein the first and second voltage shifter circuits have the same structure and are connected in parallel between the input node and an output node.
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Citations
23 Claims
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1. A level shifter, comprising:
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an input node; first and second voltage shifter circuits configured to generate an output clock of a second voltage domain in response to an input clock of a first voltage domain input via the input node; and an output node configured to output the output clock, wherein the first and second voltage shifter circuits have a same structure and are connected in parallel between the input node and an output node. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system-on-chip, comprising:
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a phase locked loop configured to generate a first clock of a first voltage domain; a peripheral block, an audio block, a display block, a graphic block, an image processing block, and a codec block operating in response to the first clock; a level shifter configured to generate a second clock of a second voltage domain based upon the first clock; and a processor operating in response to the second clock, wherein the level shifter includes first and second voltage shifter circuits that are configured to have a same structure and are connected in parallel between an input node and an output node. - View Dependent Claims (8, 9)
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10. A multimedia device, comprising:
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a processor; a working memory of the processor; a modem configured to communicate with an exterior according to a control of the processor; a storage unit configured to store data according to a control of the processor; an user interface configured to sense an external signal and to transfer the sensed signal to the processor; a display control unit configured to display an image via a display unit according to a control of the processor; a sound control unit configured to output a sound via a speaker according to a control of the processor; a codec unit configured to perform encoding and decoding operations according to a control of the processor; a clock generating unit configured to generate a clock according to an output of an oscillator; a phase locked loop configured to generate a first clock of a first voltage domain synchronized with the clock; and a level shifter configured to generate a second clock of a second voltage domain in response to the first clock, wherein the processor operates in response to the second clock, and wherein the level shifter includes the first and second voltage shifter circuits that are configured to have a same structure and are connected in parallel between an input node and an output node. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A level shifter, including:
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a first voltage shifter circuit; and a second voltage shifter circuit connected in parallel with the first voltage shifter circuit between an input node and an output node, wherein; a second clock of a second voltage domain is output from the output node in response to a first clock of a first voltage domain input at the input node, and a delay time between a rising edge of the first clock and a rising edge of the second clock is identical to a delay time between a falling edge of the first clock and a falling edge of the second clock.
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Specification