High voltage operational amplifier and high voltage transceiver using 0.25 µm 60V BCD process for Battery Management Systems

This work presents a high voltage operational amplifier (HVOPA) and a high voltage transceiver (HVT) for Battery Management Systems (BMS). Battery Interconnect Modules (BIM) in BMS must be able to accommodate input voltage up to tens of volts, perhaps even hundreds of volts, which is difficult to be realized using a logic-based process. To realize a possible solution on silicon, BIM shall be fabricated using HV semiconductor processes, which usually are constrained by the voltage drop limitation between gate and source of HV devices. To overcome such a limitation, a HVOPA and a HVT are proposed in this work to carry out high voltage analog circuit design and data transmission. An experimental prototype is implemented using a typical 0.25 μm 1-poly 3-metal 60V BCD process. The post-layout-extracted simulation results proved the functional correctness of our proposed design.