| 摘要 |
<p>Disclosed is a touch input device which comprises: a touch electrode pad disposed to generate touch input capacitance between a user input tool and the touch electrode pad; a first switch and a first operational amplifier; and a second switch and a second operational amplifier. A first one end portion of the first switch is connected to the touch electrode pad, and a first other end portion is connected to a non-inverting input terminal of the first operational amplifier. A second one end portion of the second switch is connected to the touch electrode pad, and the second other end portion is connected to a non-inverting input terminal of the second operational amplifier. A first electrical potential (VH) is applied to an inverting input terminal of the first operational amplifier, and a second electrical potential (VL) is applied to an inverting input terminal of the second operational amplifier (the second electrical potential < the first electrical potential). In addition, a first integration capacitor is connected between the non-inverting input terminal of the first operational capacitor and an output terminal of the first operational amplifier, and a second integration capacitor is connected between the non-inverting input terminal of the second operational amplifier and an output terminal of the second operational amplifier.</p> |
