low-power design is all about fancy hardware , but honestly Software plays a big role.fixed point math instead of floating point when possible, it can save power in some casesFloating point calculations require a dedicated FPU in the hardware, that alone can take up more power. Now fixed point math can be done purely in software using integer operations, later on saving power on microcontrollers without an FPU. fixed point has lower precision.
low-power designfixed pointfixed pointfixed pointfloating pointFloating pointFPU