Patent ID: 7830175

Claim:
A voltage level shifter, comprising: a single-rail input connected to a low-voltage domain; and a voltage-transition circuit connected to the single-rail input, the voltage-transition circuit being configured to convert a voltage of the low-voltage domain received via the single-rail input to a voltage of a high-voltage domain; wherein the voltage-transition circuit includes an input-falling-transition circuit, the input-falling-transition circuit comprising: a first p-type transistor; and a first n-type transistor having a drain connected to a drain of the first p-type transistor at an input contact point, the first n-type transistor having a source connected to the single-rail input, the first n-type transistor having a gate connected to a reference voltage, the first p-type transistor having a source connected to a VDDH voltage of the high-voltage domain; wherein the voltage-transition circuit includes an input-rising-transition circuit, the input-rising-transition circuit comprising: a second n-type transistor having a gate connected to the single-rail input, the second n-type transistor having a source connected to a ground voltage, the second n-type transistor having a drain connected to an output contact point, the output contact point being connected to a gate of the first p-type transistor of the input-falling-transition circuit; a second p-type transistor having a drain connected to the output contact point, the second p-type transistor having a gate connected to the input contact point of the input-falling-transition circuit; and a third p-type transistor connected in series with the second p-type transistor, the third p-type transistor having a drain connected to a source of the second p-type transistor, the third p-type transistor having a source connected to the VDDH voltage of the high-voltage domain, the third p-type transistor having a gate connected to the single-rail input.