Bidirectional level conversion circuit

Abstract

A bidirectional level conversion circuit for converting an input signal in a first voltage domain into an output signal in a second voltage domain. The bidirectional level conversion circuit includes a first shifting circuit, a second shifting circuit and an OR gate. The first shifting circuit is used to generate a first shifting signal according to the input signal. The second shifting circuit and the first shifting circuit operate on mutually exclusive voltage domains and are connected in parallel to generate a second shifting signal according to the input signal. Two input terminals of the OR gate are respectively coupled to the output terminals of the first shifting circuit and the second offset circuit, and are used to generate output signals according to the first offset signal and the second offset signal. The first offset circuit includes a resistor, a MOS and a current source connected in series with each other. The second offset circuit includes a first voltage domain circuit, a first MOS, a second MOS and a second voltage domain circuit connected in series with each other.

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