| 摘要 |
A power-on reset circuit input stage includes a current source charging a capacitor from a first power supply voltage to produce a reset signal, and a current shutoff means for shutting of the current source when the reset signal reaches a desired threshold voltage (i.e., when the capacitor is charged up). Beneficially, the current shutoff means comprises a transistor connected between current source and a second power supply voltage. Advantageously, the transistor is controlled by a feedback voltage that may be the output signal, or a voltage derived from the output signal by a capacitive divider, for example.
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