This　paper　proposes　an　energy-efficient,　12-stage　charge　pump　with　constant　threshold　voltage.　This　new　charge　pump　utilizes　2　pairs　of　non-overlapping　clocks.　Under　control　of　an　extra　pair　of　clocks,　each　charge　pump　cell　(CPC)　is　equivalent　to　a　switch.　Without　reduction　by　a　threshold　voltage　and　the　limitation　of　body　effects,　a　higher　output　voltage　than　that　of　the　traditional　charge　pump　is　obtained　by　the　proposed　circuit,　which　is　fabricated　in　a　0.18　mu　m　complementary　metal-oxide　semiconductor　(CMOS)　process.　With　an　input　voltage　from　0.7V　to　1.4V,　the　output　voltage　range　is　from　5.8V　to　12.5V.　With　a　2-pF　load　capacitor,　the　power　consumption　is　only　62.7　mu　W　at　maximum　DC　output　voltage　of　12.5V.　This　circuit　is　intended　to　generate　an　on-chip　bias　voltage　for　a　microelectromechanical　systems　(MEMS)　microphone.