Importance

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Abstract

A reference circuit for an electronic device having a plurality of power supply voltages comprises a supply start-up circuit, a power-down start-up circuit, and a reference generating circuit. The supply start-up circuit comprising a resistive-capacitive (RC) circuit coupled between a first power supply voltage and a ground. The RC circuit includes a pulse node coupled between a first capacitor and a resistive element, and generates a power-up pulse signal at the pulse node. The power-down start-up circuit is powered by a second power supply voltage and comprises a pulse generation circuit that generates a first start-up signal. The reference generating circuit outputs a reference signal. The reference generating circuit exists a low-power mode when either of the power-up pulse signal and the first start-up signal is generated.

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First Claim