Touch detection circuit, touch sensing chip and electronic device

Abstract

A touch detection circuit, a touch sensing chip and an electronic device are disclosed. The touch detection circuit includes charge/discharge circuits, which are configured to charge or discharge the sense channels during scanning periods to convert sense signals on the sense channels into sense voltages; a reference voltage generator circuit, which is coupled to the sense channels of the touch screen and is configured to produce a reference voltage related to the voltages on the sense channels; programmable gain amplifiers including first input terminals coupled to output terminals of the charge/discharge circuits and second input terminals coupled to an output terminal of the reference voltage generator circuit, the programmable gain amplifiers configured to amplify differences between the sense voltages and the reference voltage; analog-to-digital converters, which are coupled to the programmable gain amplifiers and are configured for quantization of the differences that have been amplified by the programmable gain amplifiers.