硬件设计指南EHARDWARE DESIGN TECHNIQUES SECTION 10 HARDWARE DESIGN TECHNIQUES I I I I I Low Voltage Interfaces Grounding in Mixed Signal Systems Digital Isolation Techniques Power Supply Noise Reduction and Filtering Dealing with High Speed Logic 10.a HARDWARE DESIGN TECHNIQUES 10.b HARDWARE DESIGN TECHNIQUES SECTION 10 HARDWARE DESIGN TECHNIQUES Walt Kester LOW VOLTAGE INTERFACES Ethan Bordeaux, Johannes Horvath, Walt Kester For the past 30 years, the standard VDD for digital circuits has been 5V. This voltage level was used because bipolar transistor technology required 5V to allow headroom for proper operation. However, in the late 1980s, Complimentary Metal Oxide Semiconductor (CMOS) became the standard for digital IC design. This process did not necessarily require the same voltage level……