This　paper　presents　an　improved　indirect　feedback　instrumentation　amplifier　for　reading　ECG　signals.　The　circuit　uses　a　charge　pump　module　and　an　integral　feedback　offset　suppression　module.　The　input　common　mode　range　(ICMR)　is　extended,　and　the　electrode　offset　and　baseline　drift　in　the　ECG　signal　are　suppressed.　The　circuit　is　designed　by　using　0.18μm　CMOS　process.　The　simulation　shows　that　the　circuit　can　operate　at　the　input　offset　voltage　200mV　at　the　2V　supply　voltage.　The　input　common　mode　range　is　0∼3.4v,　the　gain　is　46dB,　the　power　consumption　is　121.6μW,　and　the　common　mode　rejection　ratio　is　124dB.　©　2017　IEEE.