174 cheatsheet

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San Jose State University *

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174

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Electrical Engineering

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Apr 3, 2024

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Given an integer-N PLL circuit with digital phase detector, VDD = 2 π V and RC = 10 toproduce the output frequency range from f = 50 MHz to f = 80 MHz with5 MHz channel spacing.What are phase detector K (V/rad) gain and VCO gain K (rad/s V). Ans: KD = 2 V/rad, KO = 30,000,000 rad/s V Given an integer-N PLL circuit with digital phase detector, VDD = 2 π V and RC = 10 to produce the output frequency range from f = 50 MHz to f = 80 MHz with 5 MHz channel spacing. What is the appropriate choice for reference frequency f and the ranges of dividevalues N that will be used for this choice of reference frequency? Ans: fIN = 5 MHz, N = 10 - 16 Given an oscillator F = 8 MHz and a PLL synthesizer to produce an output F = 99.2 MHz. Determine lowest possible counter values of R and N using N-integer PLL synthesizer. R = 10, N = 124 Given an oscillator F = 8 MHz and a PLL synthesizer to produce an output F = 99.2 MHz.Determine the lowest possible counter values of R and N, N+1 using Fractional N- integer PLL synthesizer. Ans: R = 8; N, N+1= 99, 100 Given an oscillator F = 8 MHz and a PLL synthesizer to produce an output F = 99.2 MHz.Determine the lowest possible counter values for R, N1, N2 and N3 using 4-modulus Pre-scaler PLL synthesizer Ans: R = 80, N1 = 9, N2 = 9, N3 = 2 Given an oscillator F = 8 MHz and a PLL synthesizer to produce an output F = 99.2 MHz. Use the counter N1, N2 and N3 from previous question, what is the counter value at the fourth clock.Answer: 442 For Op-amp circuit in Fig. 2 (short V2 to ground), which of the following statement is FASLE? a) Vx = 0V b) I1 = I3 c) I1 = I2 d) I2 = 0A e) Circuit is an inverting op-amp. Ans: I1 = I2 For Op-amp circuit in Fig. 3 (short V1 to ground), which of the following statement is FASLE? a) Vy = V2 b) I4 = I5 + I6 c) I5 = I6 d) Circuit is a non- inverting Op-amp e) Vout2 = V2, Ans: Vout2 = V2 In order to determine the output voltage Vout, use superposition principle to find Vout1 by shorting V2 as shown in Fig. 2 and Vout2 by shorting V1 as shown in Fig. 3, then Vout = Vout1 + Vout2. Ans: Vout = - 1/2 V1 + 2 V2 In order to determine the output voltage Vout, use superposition principle to find Vout1 by shorting V2 as shown in Fig. 2 and Vout2 by shorting V1 as shown in Fig. 3, then Vout = Vout1 + Vout2. Ans: Vout = 0V

1.Which of the following is NOT characteristic of Ideal Op-Amp? Answer: Infinite output impedancedance 2. An Op-Amp with slew rate SR = 0.628V/ μ s has an input voltage Vin(t) = 10 sin(2 π × 10 t). What is the maximum gain A of the Op-Amp that will prevent the output voltage[Vout(t) = A Vin(t)] distortion?- Answer: A=10 3. For a sinusoid signal Vin(t) = 2cos[2 π (300)t] + cos[2 π (500)t] is sampled at f = 800Hz. What is the recovered signal Vrec(t) after sampled.-Asnwer: Vrec(t) = 3 cos[2 π (300)t] 4. A 12 bit ADC has a maximum output voltage of +4.095V. Compute the equivalent digital number output for the input analog signal of +1.221v. Answer: 0100 1100 0101 5. Given a 3-bit ADC with Vref = 4V. The plot of the measured of the analog input and digital output code of the ADC is given below. Answer: Missing code, Wide code width, Narrow code width, Positive gain error 6. Given a 3-bit ADC with Vref = 4V. The plot of the measured of the analog input and digital output code of the ADC is given below. Ans: DLN1(001) = 0 LSB, DNL2(010) = -1 LSB, DNL3(011) = 0 LSB 7. Given a 3-bit ADC with Vref = 4V. The plot of the measured of the analog input and digital output code of the ADC is given below. Ans: DLN4(004) = 0.5 LSB, DNL5(101) = -0.5 LSB, DNL6(110) = 0 LSB 8. Given a 3-bit ADC with Vref = 4V. The plot of the measured of the analog input and digital output code of the ADC is given below. Identify INL3 (001) (in volts) = DNL1(001) + DNL2(010) + DNL3(011) Answer: ILN3(011) = - 0.5 V 9. Given a 3-bit ADC with Vref = 4V. The plot of the measured of the analog input anddigital output code of the ADC is given below. Identify INL6 (110) (in LSB) = DNL1(001) + DNL2(010) + DNL3(011) + DNL4(100) +DNL5(101) + DNL6(110) Answer: ILN6(110) = - 1 LSB 10. Given: 8-bit ADC, Vin = 6.3V and Vref = 10V. Find digital output value for Vin. i)1001 0000 ii)1010 0001 iii)1010 0010 iv)1010 0101 v)None of the above Answer: None of the above 11.Given a 4-bit Binary Weighted Resistor DAC with Rf = R = 2k Ω , Vref = 8V.Determine the output voltage Vout when binary input is 1001. Answer: Vout = - 9 V 12. Given a buck converter with constant input voltage VIN = 20V, switching frequency is f=25kHz, inductance L = 1mH and load resistor R = 100. Evaluate the duty ratio D when the buck converter operates at the CCM-DCM boundary condition. Answer= D = 0.5 13.Given a buck converter with constant input voltage VIN = 20V, switching frequency is f = 25kHz, inductance L = 1mH and load resistor R = 100. What is the output voltage Vout using the duty cycle found in previous question? Answer: Vout = 10V 14. Given a buck converter with constant input voltage VIN = 20V, switching frequency is f = 25kHz, inductance L = 1mH and load resistor R = 100. When the duty cycle D = 0.4, assume the circuit is operating in DCM, calculate the output voltage Vout. Answer: Vout ≈ 8.55 V 15.Given a buck converter with constant input voltage VIN = 20V, switching frequency is f = 25kHz, inductance L = 1mH and load resistor R = 100. When the duty cycle D = 0.4, assume the buck converter is operating in DCM, use Vout from previous question to calculate output current Iout and the inductor ripple current Δ IL. Answer: No answer text provided. 16.If the duty ratio D is 0.4, evaluate the minimum inductance of L to maintain continuous mode operation while all other parameters remain the same. Answer : L = 1.2 mH 17.Which of the following is NOT considered as a linear voltage regulator? asnwer: Switching regulator 18.Which of the following is NOT an advantages of Energy Harvesting (EH)? Aswer: Inexpensive 19.Which of the following is FALSE for Energy Harvesting Storage? Answer: Supercap has the smallest Physical Size 20.Which of the following represent the equivalent thermocouple transducer electrical model? 21. The EH Interface circuit/Power Conditioning is used to: Answer: All of the mentioned Region? : All of the above 22.Which of the following statement is CORRECT for Radio-Frequency IDentification (RFID)? Answer: All of these above 23.Which of the following statement is FALSE for Radio-Frequency IDentification (RFID) tags? Aswer: All of these above 24.Which of the following statement is CORRECT for Radio-Frequency IDentification (RFID)? Answer Multiple active RFID tags can be read at the same time. 25.Which of the following statement is FALSE for Near Field Communication (NFC)?: Answer: NFC is a long range low frequency wireless technology that carry secure two-way interactions between electronic devices. 26. What is the need to generate corrective control voltage in phase locked loop? Answer: All of the mentioned 27. Four main di ff erent technologies used to make touchscreens today are: Resistive Sensing, Capacitive Sensing, Surface Acoustic Wave and Infrared LED or Optical 28.The basic touchscreen system has three main components: A touch screen sensor, a controller and software driver 29. Which of the following is NOT a reason to use touch screen?Answer: Improve security and reduce power consumption. 30. Three main components of a basic touchscreen system are: A touch screen sensor, a controller and software driver 31: For the touch screen is shown below, how many sensors require for self-projected capacitance (SPC) and how many sensors require for mutual capacitance (MC)?Answer SPC = 18 sensors, MC = 81 sensors 32. Assume the self-projected capacitance touch screen is shown below, for multi-touch occur at two points (X2, Y3) and (X6, Y3), how many ghost points to be obtained? Answer: No ghost point 33. Which of the following is FALSE for self-projected capacitance (SPC) and mutual capacitance (MC)?Asnwer: Both of the self-projected capacitance (SPC) and mutual capacitance (MC) support multi-touch. 34. Which touch screen technologies support multi-touch? Answer: Projected capacitive and infared technologies 35. Which of the following is CORRECT for "Touchscreen Market 2013-2018 by Technology"? Answer: All of the above 36. Given a 4-wire analog resistive touch screen with the following specs: Resistance is 1000 Ω /cm of electrode line Screen size is (H x W) 20cm x 30cm and supply voltage V = 6V. Answer x = 15 cm, y = 5 cm 37.Which of the following is FALSE for the Traditional Infared Technology? Answer: The infrared screens only work with a stylus. 38. Which is NOT the advantages of traditional infrared? Asnwer: Low resolution 39.Which of the following is CORRECT for Surface Acoustic Wave (SAW) technology? Answer: All of the above

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