PCB Design
To test the functionality of the chip, a custom PCB was designed using the software PCB Artist, the schematic on the figure shows the abstract layout for the PCB. There are three voltage regulators to generate the supply voltage with the external power supplied by the batteries, the 1.8V power supply. The 0.9V reference voltage is generated used a resistor divider. Also, triangle wave generator of 500kHz is built.