Importance

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Abstract

A detecting circuit for detecting an input signal crossing a ground level is disclosed. The circuit comprises two PMOS transistors and two NMOS transistors connected, respectively. The PMOS transistors have source terminals connected to a power voltage, the gate terminals connected together and the drain terminal of the second PMOS transistors. The first NMOS transistor has the source terminal as an input terminal to retrieve an input signal, and the drain terminal to be act as output terminal and the second NMOS transistor has the source terminal grounded. The gate terminals of the two NMOS transistors are connected together and to a biased voltage. The circuit can also be used to detect the power voltage if the input terminal is set at the source terminal of the first PMOS transistor and the source terminal of the first NMOS transistor grounded.

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First Claim