Patent ID: 8949584
Filing Date: 2015-02-03
Classification: G06F,H03K

Abstract:
1. A power on reset circuit, comprising: a current mirror connected to a power node, the power node receiving a variable power supply voltage, the current mirror to supply a first current to a first line and a second current to a second line; a comparative voltage generator to generate a comparative voltage using the first current provided via the first line; a driver connected to the second line, the driver to activate a reset signal in response to a voltage of the second line; and a ground selecting transistor to connect the second line and a ground node according to the comparative voltage, wherein the comparative voltage generator includes: a first impedance element connected to the first line and a second impedance element connected between the first impedance element and the ground node, wherein a node voltage of a node between the first and second impedance elements is provided as the comparative voltage, and a detection transistor having a gate connected with the node formed between the first and second impedance elements, a first end of the detection transistor connected with a first node formed between the first line and the first impedance element and a second end of the detection transistor connected with the ground node.