CE121 -- Microprocessor System Design
Assignment 7
Out: February 20, 1997
Due: February 26, 1997

1. (30 points) Design a 4-bit SAR (successive approximation register) and control for an ADC. That is, fill in the blank box of the ADC datasheet. The circuit should have a clock input, a start input, and a comparator input. Fully explain your circuit.
2. (30 points) It is a common maxim in the signal conversion community that ``DAC's multiply and ADC's divide."
   1. Explain what will happen if a DAC's is connected to an analog signal rather than a stable voltage.
   2. Explain what happens when you hook up an ADC's to an analog signal rather than a stable voltage and its analog input voltage, , to a stable voltage rather than an analog signal.
   3. Given 2 analog input voltages, design a circuit that will generate a logic 1 when the voltage on the first input is greater than 20% of the voltage on the second input and a logic 0 otherwise. Both voltages are limited to between 0 and 10 volts and the second voltage is always greater than the first. Use the results of the first two parts of this problem.
3. (5 points) Grader's discretion.