Design of H-Bridge Circuit for CMOS Stimulator and its Application Analysis

The relationship between nerve signals and electrical signals promotes the develop of neural stimulators. The Complementary Metal Oxide Semiconductor (CMOS) technology brings benefits to the development of implantable nerve stimulators. This paper reviews the theoretical basis of neural stimulator as well as its common structure. In part 3, an experiment based on software simulation is conducted to study the behavior of ‘H’ bridge. Some optimization of digital to analog converter is discussed in part 4. Experiment shows that the ‘H’ bridge has stale control to produce biphasic current. Studies show that current mirrors widely used in the design of neural stimulator which is included in DAC and also used in the output driver to increase output resistance. Blocking capacitors and optimized DAC are equipped in the stimulators to address the safety issues. CMOS technology, with its excellent characteristics such as low power consumption, provides the possibility of optimal design scheme for neurostimulators and neurostimulators have great potential for development.