With　the　rising　prevalence　of　neurological　disorders,　the　demand　for　precise　neuromodulation　technologies　has　increased.　Meanwhile,　advancements　in　microelectronics　and　implantable　medical　devices　have　attracted　significant　attention　in　clinical　treatment　and　neuroscience.　Previous　research　on　neural　stimulators　has　faced　challenges　such　as　excessive　power　consumption,　insufficient　stimulation　precision,　and　temperature　drift,　affecting　the　stability　and　safety　of　long-term　implantation.　This　paper　proposes　a　neural　stimulator　circuit　design　based　on　CMOS　devices.　By　adopting　a　regulated　cascode　current　mirror　and　an　improved　Nagata　current　source,　the　design　achieves　low　power　consumption,　high　precision,　and　excellent　temperature　stability　in　biphasic　current　output.　To　meet　the　demands　of　different　clinical　applications　for　neural　stimulation,　a　programmable　biphasic　current　control　module　is　developed,　allowing　flexible　adjustment　of　current　amplitude,　pulse　width,　and　other　timing　parameters,　thereby　reducing　tissue　damage　risks　and　providing　personalized　medical　solutions.　Simulation　results　demonstrate　that　the　proposed　circuit　outperforms　in　output　accuracy,　energy　efficiency,　and　temperature　stability,　providing　an　efficient　and　safe　solution　for　the　application　of　implantable　neural　stimulators　in　neuroscience　and　clinical　treatment.　©　2025　IEEE.