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(a) Adaptive VREC and fixed VDD vs. ISTIM, (b) stimulation power efficiencies vs. ISTIM, and (c) overall power efficiencies, i.e., rectifier + stimulator, vs. ISTIM. Solid line: adaptive supply control, dashed line: fixed supply, electrode-tissue model: RS = 2 kΩ and CDL = 500 nF in series, and TS = 400 μs.
