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. Author manuscript; available in PMC: 2020 Aug 1.
Published in final edited form as: IEEE Trans Biomed Circuits Syst. 2019 May 23;13(4):608–618. doi: 10.1109/TBCAS.2019.2918761

Fig. 4.

Fig. 4.

Schematic diagrams of the (a) voltage doubler with built-in charger and the cap-less LDO, (b) forward data telemetry with OOK modulation, (c) LSK back telemetry, (d) clock generator for the timing of stimulation and charging, (e) current limiter and stimulation output stage.