B) SAR ADC speed is limited, needs anti-aliasing filter C) Dual-Slope ADC slow conversion, expensive external components required (high accuary components) D) Sigma-Delta ADC multibit ADC and multibit feedback DAC higher order 10. a) SAR b) +- 0,4 LSB c) 1,4 ms d) 8,4 us 11. Output voltage is 3,925V 12. Output voltage is 5,67V 13. The resolution of a 16bit DAC is 65536 bits 14. Gain error, offset error, resolution, monotonicity, accuary (relative) 15. A) 1,25 B) 3,125 C) 1,875 16. The advantages of PWM systems: 1) Very high efficiency (not much heat produced) 2) Relatively cheap 3) Makes the motor run better
c) Minimum acquisition time 1,4 ms d) Minimum conversion time 8,4 us Question 11. A 10 bit DAC has a reference voltage of 5.12V. What is the output voltage for a binary input code of 11000100012? 3,925V Question 12 A 12 bit DAC has a reference voltage of 10V. What is the output voltage for a binary input code of 1001001001002? 5,67V Question 13 What is the resolution of a 16-Bit DAC? 65536 bits Question 14 Name 5 characteristics of DAC’s. Gain error, offset error, resolution, monotonicity, accuracy Question 15 For the following 3-Bit DAC, analyse the circuit to verify its operation for the following input combinations. (Assume VR=5V). a) S2S1S0=0102 1,25 b) S2S1S0=1012 3,125 c) S2S1S0=0112 1,875 Question 16 1. Draw the motor current and the motor voltage characteristic during the operation with a constant PWM signal of 50% duty cycle. 2. Recommend the suitable range of frequency for this PWM applied in microcontrollers
B) Speed limited to ~5Msps. May require anti-aliasing filter. C) Slow Conversion rate. High precision external components required to achieve accuracy. D) Higher order (4th order or higher) - multibit ADC and multibit feedback DAC. Question 10 A) SAR B) ± 0.4 LSB C) 1.4 ms D) 8.4 us Question 11 VO = 3,925 V Question 12 VO = 5,67 V Question 13 Resolution = 65536 bits (64K) Question 14 1. Resolution 2. Offset Error 3. Gain Error 4. Monotonicity 5. Relative Accuracy Question 15 A) 5/4 = 1.25 B) 25/8 = 3.125 C) 15/8 = 1.875 Vref R f (4S2 2S1 S0 ) 5(4S2 2S1 S0 ) VOut 8R 8 Question 16 Pulse-Width Modulation (PWM) is a commonly used technique for controlling power to inertial electrical devices and DC motors. The PWM switching
11000100012 = 785 210 = 1024 (5.12/ 1024) * 785 = 3.925V Output voltage = 3.925V Question 12 A 12 bit DAC has a reference voltage of 10V. What is the output voltage for a binary input code of 1001001001002? 1001001001002 = 2340 212 = 4096 (10 / 4096) * 2340 = 5.71 V Output voltage = 5,71 V Question 13 What is the resolution of a 16-Bit DAC? 216 = 65536 Question 14 Name 5 characteristics of DAC’s. 1. Gain error 2. Offset error 3. Resolution 4. Monotonicity 5. Accurary(relative) Question 15 For the following 3-Bit DAC, analyse the circuit to verify its operation for the following input combinations. (Assume VR=5V). a)S2S1S0=0102 Output voltage = 1.25 V b)S2S1S0=1012 Output voltage = 3,125 V c)S2S1S0=0112 Output voltage = 1.875 V Question 16 Pulse-Width Modulation (PWM) is a commonly used technique for controlling power to inertial electrical devices and DC motors.
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