| CPC H03K 19/018521 (2013.01) | 9 Claims |
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1. A level shifter for receiving an input signal through an input terminal and converting the input signal to an output signal, comprises:
an input stage circuit, coupled to an output terminal and further coupled to the input terminal to receive the input signal, receiving an inverted input signal, wherein the inverted input signal and the input signal are reverse to each other, and the input stage circuit comprises:
a first N-type transistor comprising a gate coupled to the input terminal, a drain coupled to a first node, a source coupled to a ground, and a bulk, wherein the source of the first N-type transistor is connected to the bulk of the first N-type transistor; and
an output stage circuit, coupled to a power terminal to receive a supply voltage and further coupled to the output terminal and the first node, wherein the output stage circuit comprises:
a first P-type transistor comprising a gate, a source coupled to the power terminal, a drain coupled to the first node, and a bulk; and
a second P-type transistor comprising a gate coupled to the output terminal, a source coupled to the power terminal, a drain coupled to a second node, and a bulk,
wherein the source of the first P-type transistor is disconnected from the bulk of the first P-type transistor,
wherein the output signal is generated at the output terminal, and an inverted output signal which is reverse to the output signal is generated at the first node,
wherein the source of the second P-type transistor is connected to the bulk of the second P-type transistor, and
wherein the gate of the first P-type transistor is coupled to the ground, and the source of the first P-type transistor is coupled to the second node.
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