What is aliasing? What is the Nyquist rate? Why was the Nyuist rate determined to be 5x? Can I effectively sample a square wave at 2.1 times its frequency? In the frequency domain, what does the aliased signal look like compared to the original signal? What does a square wave look like in the frequency domain? Why is it difficult to sample a square wave? How would you prevent aliasing on s signal going into an ADC? What’s the difference between a MOSFET & BJT? Where would you use one over the other? What would your example of an RF amplifier look like with a BJT? Describe UART, I2C, and SPI to me, noting key differences. What’s the data rate or each bus? Which bus has an open drain? If the I2C has an open drain, would you use pull-ups or pulldowns and why? How does the I2C device know when to transmit or receive, is this a standard? Where would you use I2C vs. SPI? What are physical differences between I2C & SPI? What are the main differences between Linear and Switching regulators? What dictates the duty cycle of a switching regulator? Where would you use an LDO instead of a Buck? How do you determine the frequency of the buck? Is higher/lower switching frequency better for larger/smaller loads?