Improved SPI Controlled, Low-Voltage, High Speed, Multi-Channel Switch

An improved architecture of multi-channel analog switch with serial digital interface is proposed. The circuit including 8 individually controlled, single-pole, single-throw (SPST) switches, commanded through SPI interface, is proved to operate at a serial clock frequency up to 2.5 MHz and an input rise/fall time over 4 µs, respectively, for different supply and temperature ranges. Also, the data setup time or minimum reset pulse width parameters are improved. The approach in designing and simulating this circuit is further detailed throughout the paper.