High Voltage Interfaces for CMOS/DMOS Technologies
— The first fully integrated array of High Voltage (HV) Digital-to-Analog Converters (DACs) was designed in DALSA Semiconductor's 0.8um CMOS/DMOS HV process technology. The 6-bit 300V DACs are based on a current-steering, thermometer coded architecture and show a DNL of 0.16 LSB and an INL of 0.18 LSB. The current-to-high-voltage conversion is done using a high-compliance current mirror adapted to the HV technology, as traditional output resistor or op-amp solutions are not optimum for the HV process. The design is suited for applications requiring a set of digitally-controlled high-voltage signals. I. INTRODUCTION The number of transistors on integrated circuits (IC) has been on the rise since its inception. Though IC sizes may grow, the trend has resulted in the reduction in feature size of the integrated components. This scaling of technology results in advantages of increased speed, lower operating voltages and therefore lower power consumption. However, many applications require high voltages, notably intelligent motor control, biomedical applications, and optical switches including MEMS and electro-optic devices.