Patent ID: 9059703
Filing Date: 2015-06-16
Classification: H03K

Abstract:
1. A switch circuit, comprising: a plurality of switching elements, including first, second, and third switching elements, each switching element connected between an input node and an output node and including: the first switching element having a greater on-state resistance and a greater parasitic capacitance than those of the second switching element, and the second switching element having a greater on-site resistance and a greater parasitic capacitance than those of the third switching element; a detection circuit configured to output a detection value corresponding to a voltage difference between a voltage at the input node and a voltage at the output node; and a control circuit configured to switch the first switching element to the OFF state and the second switching element to the ON state such that only the second switching element is placed in the ON state among the plurality of switching elements when the detection value decreases to a first predetermined value, and then switch the second switching element to the OFF state and the third switching element to the ON state such that only the third switching element is placed in the ON state among the plurality of switching elements, when the detection value decreases to the first predetermined value again, each of the parasitic capacitances of the switching elements being equal to a parasitic capacitance between the control electrode of the respective switching element and the second electrode of the respective switching element.