Multiple function power domain level shifter
First Claim
1. A level shifter, comprising:
- an input voltage supply node and an input reference node operative within a first power domain;
an output voltage supply node and an output reference node operative within a second power domain;
an input signal node for receiving an input signal operable within said first power domain;
an output signal node;
a level shifter network which is configured to receive said input signal at said input signal node, to perform voltage shifting between said input voltage supply node and said output voltage supply node and between said input reference node and said output reference node, and to provide an output signal via said output signal node, wherein said output signal represents said input signal and is operable within said second power domain; and
wherein said level shifter circuit further comprises a ground bypass input for receiving a ground bypass signal, and wherein said level shifter circuit bypasses at least a portion of said level shifter circuit performing voltage shifting between said input reference node and said output reference node when said ground bypass signal indicates ground bypass.
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Accused Products
Abstract
A level shifter including input and output power nodes, input and output reference nodes, input and output signal nodes, and a lever shifter network. The input power and input reference nodes operate within a first power domain and the output power and output reference nodes operate within a second power domain. The level shifter network receives an input signal operable within the first power domain, performs voltage shifting between the input and output power nodes and between the input and output reference nodes, and provides an output signal output signal indicative of the input signal that operates within the second power domain. The level shifter may include power and/or ground bypass such that either one or both of power and ground voltage shifting may be bypassed for faster switching. The level shifter may include an isolation input to assert the output to a known level.
35 Citations
19 Claims
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1. A level shifter, comprising:
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an input voltage supply node and an input reference node operative within a first power domain; an output voltage supply node and an output reference node operative within a second power domain; an input signal node for receiving an input signal operable within said first power domain; an output signal node; a level shifter network which is configured to receive said input signal at said input signal node, to perform voltage shifting between said input voltage supply node and said output voltage supply node and between said input reference node and said output reference node, and to provide an output signal via said output signal node, wherein said output signal represents said input signal and is operable within said second power domain; and wherein said level shifter circuit further comprises a ground bypass input for receiving a ground bypass signal, and wherein said level shifter circuit bypasses at least a portion of said level shifter circuit performing voltage shifting between said input reference node and said output reference node when said ground bypass signal indicates ground bypass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of voltage level shifting a binary signal between independent voltage domains, comprising:
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receiving an input binary signal operative within a first power domain, wherein the input binary signal switches between a first reference voltage and a first source voltage; level shifting the input binary signal to an output binary signal operative within a second power domain, wherein the output binary signal switches between a second reference voltage and a second source voltage, and wherein the second reference voltage is different from the first reference voltage and the second source voltage is different from the first source voltage; receiving a reference bypass signal indicating that the first and second reference voltages are at a common voltage level; and bypassing said level shifting between the first and second reference voltages when the bypass signal indicates that the first and second reference voltages are at a common voltage level. - View Dependent Claims (13, 14, 15)
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16. A level shifter, comprising:
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an input voltage supply node and an input reference node operative within a first power domain; an output voltage supply node and an output reference node operative within a second power domain; an input signal node for receiving an input signal operable within said first power domain; an output signal node; a level shifter circuit which is configured to receive said input signal at said input signal node, to perform voltage shifting between said input voltage supply node and said output voltage supply node and between said input reference node and said output reference node, and to provide an output signal via said output signal node, wherein said output signal represents said input signal and is operable within said second power domain; and wherein said level shifter circuit further comprises a voltage supply bypass input for receiving a voltage supply bypass signal, and wherein said level shifter circuit bypasses at least a portion of said level shifter circuit performing voltage shifting between said input voltage supply node and said output voltage supply node when said voltage supply bypass signal indicates voltage supply bypass. - View Dependent Claims (17)
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18. A method of voltage level shifting a binary signal between independent voltage domains, comprising:
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receiving an input binary signal operative within a first power domain, wherein the input binary signal switches between a first reference voltage and a first source voltage; level shifting the input binary signal to an output binary signal operative within a second power domain, wherein the output binary signal switches between a second reference voltage and a second source voltage, and wherein the second reference voltage is different from the first reference voltage and the second source voltage is different from the first source voltage; receiving a source bypass signal indicating that the first and second source voltages are at a common voltage level; and bypassing said level shifting between the first and second source voltages when the bypass signal indicates that the first and second source voltages are at a common voltage level. - View Dependent Claims (19)
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Specification