A differential circuit (20 or 30), comprising: a plurality of electrodes (RX_0-RX_N), configured to be connected to a receiving electrode of a touch panel, comprising at least a middle electrode (RX_1-RX_N-1), wherein a middle electrode (RX_m) among the at least a middle electrode is directly adjacent to a first electrode (RX_0) and a second electrode (RX_N) of the plurality of electrodes; and a plurality of amplifiers (Amp_1-Amp_N), coupled to the plurality of electrodes; characterized in that, the differential circuit (20 or 30) further comprises at least a buffer (BF_1-BF_N-1) with a high input impedance coupled between the middle electrode and at least one amplifier of the plurality of amplifiers to block an electric current flowing from the middle electrode (RX_m) to the at least one amplifier of the plurality of amplifiers; wherein the middle electrode (RX_m) is coupled to a first amplifier (Amp_m) and a second amplifier (Amp_m+1) of the plurality of amplifiers; wherein the first amplifier (Amp_m) comprises a first input terminal and a second input terminal, the second amplifier (Amp_m+1) comprises a third input terminal and a fourth input terminal, the first input terminal is coupled to the first electrode (RX_0), the fourth input terminal is coupled to the second electrode (RX_N), the middle electrode (RX_m) is coupled to the second input terminal and the third input terminal; and wherein the buffer (BF_m) is coupled either between the middle electrode (RX_m) and the second input terminal of the first amplifier (Amp_m), or between the middle electrode (RX_m) and the third input terminal of the second amplifier (Amp_m+1). a plurality of electrodes (RX_0-RX_N), configured to be connected to a receiving electrode of a touch panel, comprising at least a middle electrode (RX_1-RX_N-1), wherein a middle electrode (RX_m) among the at least a middle electrode is directly adjacent to a first electrode (RX_0) and a second electrode (RX_N) of the plurality of electrodes; and a plurality of amplifiers (Amp_1-Amp_N), coupled to the plurality of electrodes; characterized in that, the differential circuit (20 or 30) further comprises at least a buffer (BF_1-BF_N-1) with a high input impedance coupled between the middle electrode and at least one amplifier of the plurality of amplifiers to block an electric current flowing from the middle electrode (RX_m) to the at least one amplifier of the plurality of amplifiers; wherein the middle electrode (RX_m) is coupled to a first amplifier (Amp_m) and a second amplifier (Amp_m+1) of the plurality of amplifiers; wherein the first amplifier (Amp_m) comprises a first input terminal and a second input terminal, the second amplifier (Amp_m+1) comprises a third input terminal and a fourth input terminal, the first input terminal is coupled to the first electrode (RX_0), the fourth input terminal is coupled to the second electrode (RX_N), the middle electrode (RX_m) is coupled to the second input terminal and the third input terminal; and wherein the buffer (BF_m) is coupled either between the middle electrode (RX_m) and the second input terminal of the first amplifier (Amp_m), or between the middle electrode (RX_m) and the third input terminal of the second amplifier (Amp_m+1).