Precision　operational　amplifiers　(op-amps)　adopt　dynamic　offset　compensation　(DOC)　techniques　to　achieve　microvolt-level　offset　and　nanovolt-level　noise.　However,　the　switches　in　DOC　introduce　charge　injection,　which　is　a　major　source　of　current　noise　and　residual　offset.　Charge-injection-induced　glitches　need　to　be　attenuated　via　low-pass　filtering,　which　decreases　the　usable　signal　bandwidth.　This　article　proposes　a　six-channel　precision　op-amp　with　multiphase　switch　reuse,　designed　and　simulated　in　a　0.18μm　CMOS　process　with　a　1.032　mm2　active　area.　Compared　with　the　traditional　ping-pong　architecture,　the　six-channel　op-amp　effectively　reduces　the　required　switch　width,　thereby　decreasing　the　amount　of　charge　injection.　The　multiphase　switch　reuse　technique　reduces　the　frequency　of　charge　injection　per　channel　and　shifts　the　noise　spikes　generated　by　the　switches　to　higher　frequencies.　Therefore,　the　proposed　circuit　allows　the　cutoff　frequency　of　the　post-low-pass　filter　to　be　increased,　effectively　removing　the　limitations　on　the　overall　system＇s　signal　transmission　bandwidth　imposed　by　the　front-end　amplifier.　These　techniques　results　in　an　input-referred　noise　density　of　8　nV/Hz,　an　input　offset　voltage　of　2.46　μV,　an　offset　drift　of　24.65　nV/°C,　and　a　gain–bandwidth　product　of　5.3　MHz.　©　2025　Elsevier　Ltd