Optical energy harvesting enables the development of autonomous microsensor networks. The harvest-use approach applied to monolithic standard bulk CMOS is simple but suffers from the low-voltage issue of single photodiode as a voltage supply. It is overcome by using the LCMOS approach with complementary voltage generation, thus achieving a usable supply around 900 mV. Guidelines to develop analog circuits with this approach are provided. Power supply, references and folded cascode amplifier design are introduced. Simulation results for TSMC 0.18 µm are provided and applications in the area of integrated sensors are pointed out.