Patent ID: 8274489

Claim:
A readout apparatus for a touch panel, comprising: a first selector, having a common terminal electrically connected to a first selection terminal or a second selection terminal, selectively; a current to voltage converting unit, having an input terminal coupled to the first selection terminal of the first selector; a first resistor, having a first terminal coupled to an output terminal of the current to voltage converting unit; a second selector, having a common terminal electrically connected to a first selection terminal or a second selection terminal, selectively, wherein the first selection terminal of the second selector is coupled to a second terminal of the first resistor, and the second selection terminal of the second selector is coupled to the second selection terminal of the first selector; a first operation amplifier, having a first input terminal coupled to the common terminal of the second selector, and a second input terminal receiving a first reference voltage; a third selector, having a common terminal electrically connected to a first selection terminal or a second selection terminal, selectively, wherein the common terminal of the third selector is coupled to the first input terminal of the first operation amplifier; a fourth selector, having a common terminal electrically connected to a first selection terminal or a second selection terminal, selectively, wherein the common terminal of the fourth selector is coupled to an output terminal of the first operation amplifier; a second resistor, having a first terminal coupled to the first selection terminal of the third selector, and a second terminal coupled to the first selection terminal of the fourth selector; a feedback capacitor, having a first terminal coupled to the second selection terminal of the third selector, and a second terminal coupled to the second selection terminal of the fourth selector; and a feedback switch, having a first terminal and a second terminal respectively coupled to the first terminal and the second terminal of the feedback capacitor.