Digital output code for an input of 1.2V is 001111012. Voltage range corresponding to 1 LSB is U= 0,0195V. Question 3 A 15 bit ADC has a reference voltage of 10V. What is the digital output code word for an input of 6.83V? 15 bit = 32768 10V/ 32768 = 0,0003 V 6,83V / 0,0003 = 22767 22767 = 01011000 111011112 Question 4 What is the value of the quantization error between an input voltage of 2.3V and quantized voltage with the output code word equal to 011101012 using an 8 bit ADC with 5V reference? 011101012 = 117 Correspond to 5V * 117/256 = 2.2852V Error = 2,3V – 2.2852 = 0,0148V Question 5 A digital multimeter is designed to have a readout with four decimal digits. How many bits will be required in its ADC? MAX = 9999 213 = 8192 214 = 16384 (too many digits) 13 Bit will be required in ts ADC. Question 6 Draw a circuit diagram of a 2 bit flash ADC using only resistors, comparators and NAND gates. Question 7
Question 2: An 8 bit ADC has a reference voltage of 5V. What is the digital output code word for an input of 1.2V? 001111012 What is the voltage range corresponding to 1 LSB? 0,0195V Question 3. A 15 bit ADC has a reference voltage of 10V. What is the digital output code word for an input of 6.83V? 101011101101100 Question 4. What is the value of the quantization error between an input voltage of 2.3V and quantized voltage with the output code word equal to 011101012 using an 8 bit ADC with 5V reference? 0.01484375V Question 5. A digital multimeter is designed to have a readout with four decimal digits. How many bits will be required in its ADC? 13 Bits Question 6. From Wikipedia Question 7. a) How long would it take for this ADC to complete the run-up phase? 400 µs b) How long would it take for this ADC to complete the run-down phase? 1 ms Question 8. What is the typical performance in terms of THD at a frequency of 500 kHz of:
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