Low-power wide-range level shifter
First Claim
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1. A circuit, comprising:
- a latch including a pair of cross-coupled inverters having a virtual ground node, the latch being configured to level-shift a low-voltage-domain input signal from a low voltage domain into a high-voltage-domain output signal for a high voltage domain, wherein the pair of cross-coupled inverters are configured to be powered by a high power supply voltage for the high voltage domain;
a switch coupled between the virtual ground node and ground;
an edge-triggered pulse generator configured to pulse the switch off for a transition period responsive to rising edges in the low-voltage-domain input signal and responsive to falling edges in the low-voltage-domain input signal;
a first NMOS access transistor coupled to an output node of a first one of the cross-coupled inverters; and
a first inverter powered by low power supply voltage domain, the first inverter being configured to invert the low-voltage-domain input signal into a first inverter output signal, and wherein a gate of the first NMOS access transistor is configured to be driven by the first inverter output signal, and wherein the high power supply voltage is greater than the low power supply voltage.
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Abstract
A latch-based level-shifter is provided that includes an edge-triggered pulse generator that drives a switch to switch off and isolate a pair of cross-coupled inverters in the level-shifter from ground for a transition period responsive to rising and falling edges in an input signal.
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Citations
16 Claims
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1. A circuit, comprising:
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a latch including a pair of cross-coupled inverters having a virtual ground node, the latch being configured to level-shift a low-voltage-domain input signal from a low voltage domain into a high-voltage-domain output signal for a high voltage domain, wherein the pair of cross-coupled inverters are configured to be powered by a high power supply voltage for the high voltage domain; a switch coupled between the virtual ground node and ground; an edge-triggered pulse generator configured to pulse the switch off for a transition period responsive to rising edges in the low-voltage-domain input signal and responsive to falling edges in the low-voltage-domain input signal; a first NMOS access transistor coupled to an output node of a first one of the cross-coupled inverters; and a first inverter powered by low power supply voltage domain, the first inverter being configured to invert the low-voltage-domain input signal into a first inverter output signal, and wherein a gate of the first NMOS access transistor is configured to be driven by the first inverter output signal, and wherein the high power supply voltage is greater than the low power supply voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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powering a latch-based level-shifter including a first cross-coupled inverter cross-coupled with a second cross-coupled inverter with a high power supply voltage from a high power domain; in a first inverter powered by a low power supply voltage for a low power domain, inverting a low-power-domain input signal into an inverted signal, wherein the high power supply voltage is greater than the low power supply voltage; driving a gate of a first NMOS access transistor with the inverted signal, wherein a drain of the first NMOS access transistor couples to an input of the first cross-coupled inverter and a drain of the first NMOS access transistor couples to ground; in the latch-based level-shifter, level-shifting a rising edge of the low-power-domain input signal transitioning from ground to the low power supply voltage to transition a high-power-domain output signal from ground to the high power supply voltage; responsive to the rising edge of the low-voltage domain input signal, isolating the first cross-coupled inverter and the second cross-coupled inverter from ground for a first transition period; and upon conclusion of the first transition period, re-coupling the pair of cross-coupled inverters to ground. - View Dependent Claims (12, 13, 14, 15)
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16. A circuit, comprising:
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a latch including a pair of cross-coupled inverters, the latch being configured to level-shift a low-voltage-domain input signal into a high-voltage-domain output signal; means for isolating the pair of cross-coupled inverters from ground for a transition period responsive to a transition of the low-voltage-domain input signal from ground to a low supply voltage and responsive to a transition of the low-voltage-domain input signal from the low supply voltage to ground and for recoupling the pair of cross-coupled inverters to ground upon termination of each transition period, wherein a first one of the cross-coupled inverters comprises a first PMOS transistor having a source coupled to a high-voltage-domain power supply node configured to supply a high supply voltage that is greater than the low supply voltage, the first PMOS transistor having a drain coupled to a first NMOS transistor having a source coupled to the means for isolating, and wherein a remaining second one of the cross-couped inverters comprises a second PMOS transistor having a source coupled to the high-voltage-domain power supply node and a drain coupled to a second NMOS transistor having a source coupled to means for isolating; a first NMOS access transistor coupled to an output node of a first one of the cross-coupled inverters, and a second NMOS access transistor coupled to an output node of a remaining one of the cross-coupled inverters.
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Specification