transmission channels 111 a plurality of mutual capacitors 121 and one reception line 122 further in fig2 the reception line 122 is connected to the inversion node of the charge amplifier 131 the reference voltage is connected to the non inversion node and a feedback circuit is connected between the inversion node and the output terminal in the feedback circuit of fig2 one resistor and one capacitor are connected to each other in parallel the plurality of coded signals input to the transmission channel are converted into the current in each mutual capacitor 121 and the converted current is input to the inversion node of the charge amplifier 131 along the reception line 122 in this case the sum of the currents flowing in the reception lines 122 may be calculated as in equation 1 i total s c 1 v 1 c 2 v 2 c n v n equation 1 that is the converted currents are combined in the inversion node of the charge amplifier 131 and form the output voltage through the feedback circuit the output voltage may be calculated as in equation 2 in this case since the coded signals are simultaneously input to the plurality of transmission channels in the cdms readout circuit the overcurrent may be generated in.