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- The average value of the output voltage with PWM is Vo = 5 V. If the on state duration Ton is 5 µs and supply voltage Vin = 20 V, find the duty ratio d, switching period Ts and switching frequency fs of the system. Draw the waveforms for Vin and Vo voltages stating on and off durations.Consider the circuit. The transistor has a parameter β that varies between 50 and 200. The operation of the circuit and the electrical variables at the end points must be known. end points. Calculate the following for β = 50 and β = 200. a) lE, VE and VB (DC analysis). b) The input resistance Rin (small signal analysis). c) Voltage gain V0/ Vsig (Small Signal Analysissolve 4 Use a BJT op-amp)1 You’ve been asked to build an alarm system using monstable multvibrator having an activetime pf 100msec.. Explain the principle of operation and the type feedback of the op-amp.What is the advantage of this circuit?2 You’ve been asked to build a low frequency square wave generator using a basic comparatorhaving a frequency of 10kHz and 50% duty cycle. Explain the principle of operation and thetype of feedback of the op-amp. What is the advantage of this circuit?3 Build a Wein-Bridge oscillator using, C=1µF and +10V power supply to produce 10 kHzsinusoidal waveform. Generate your plots and compare output results. Highlight anydiscrepancies and discuss what happens if we want to increase the frequency to 100 kHz.4 Build a high frequency Colpitts oscillator producing 10kHz Discuss its advantage over RCoscillators. How can you modify the circuit to include a crystal in you circuit. What is atypical application of such an oscillator?
- Suppose that each output channel of a computer’ssound card can be represented by a 1-V ac sourcein series with a 32-Ω resistor. Each channel ofthe amplifier in the external speakers has an inputresistance of 20 k , and must deliver 10 W intoan 8-Ω speaker. (a) What are the voltage gain, currentgain, and power gain required of the amplifier?(b) What would be a reasonable dc power supplyvoltage for this amplifier?4. What is the function of the lead-lag network in the Wein Bridge oscillator? 5. Which type of feedback is used in the Wein Bridge oscillator 6. What is the gain of the Wein Bridge oscillator? 7. What are the applications of the Wein Bridge oscillator? 8. What is the condition for generating oscillations? 9. What is the difference between damped oscillations undamped oscillations? 10. Wein Bridge oscillator is either LC or RC oscillator. 11. What are the drawbacks in using Wein Bridge Oscillators?2. Select ONE (1) transducer or sensor with available in the market, with providing the brand, model and technical specification of the selected transducer or sensor, you are required to i. Explain its designed measurand and the working range. ii. Explain its basic working principles and any steps required to take in order to avoid any error (ex. Loading error) during measurement process. iii. Identify either the selected transducer or sensor required a signal conditioner. iv. Propose ONE (1) cable with is suitable to be connected with the selected transducer or sensor
- Consider the circuit of Figure 12.7 on page 605. Assume that VCC=20 V, VBB=0.3 V, RB=40 kΩ, and RC=2 kΩ. The input signal is a 0.2-V-peak 1-kHz sinusoid given by vin(t)=0.2 sin(2000πt). The common-emitter characteristics for the transistor are shown in Figure P12.18. Determine the maximum, minimum, and Q-point values for vCE. What is the approximate voltage gain for this circuit? Why is the gain so small in magnitude?solve 2 (Use a BJT op-amp) 1. You’ve been asked to build an alarm system using monstable multvibrator having an active time pf 100msec.. Explain the principle of operation and the type feedback of the op-amp. What is the advantage of this circuit? 2. You’ve been asked to build a low frequency square wave generator using a basic comparator having a frequency of 10kHz and 50% duty cycle. Explain the principle of operation and the type of feedback of the op-amp. What is the advantage of this circuit?amplifier (boost) DC-DA converter circuit, given below; 1- Source voltage (E) value: In the voltage range of [A B] (Volts) 2- Switching frequency (f) value: M kHz 3- Voltage between load terminals (Vload) F (volt) 4- Capacity value is 470 (microF) 5- Pload>= H(watts) consumed per load In which case below do you see the lowest L inductance value in microH that can keep the DC-DC converter in a continuous current state under the conditions? A=25 VOLT B=40 VOLT M= 25kHz F = 55 VOLT H=15 Watts a) 454.5475 b) 382,045 c) 263.62 d) 128.5 e) 581.81
- Design a MOSFET differential pair which produces a differential output voltage of 2 V when (a) v1 =-90 mV and v2 = +90 mV (b) when one of the transistor grounded. The transistor parameters are Vtn =0.8 V, kn’(W/L) = 0.4 mA/V2 and λ=0. Choose the supply voltage to be ±10V with a constant currentsource of 5 mA. Also determine the maximum common mode input voltage.1. Give the formula for the frequency of oscillations in the Wein Bridge Oscillator circuit? 2. What is the condition for the Wien Bridge oscillator to generate oscillations? 3. What is the total phase shift provided by the Wein Bridge oscillator? 4. What is the function of the lead-lag network in the Wein Bridge oscillator? 5. Which type of feedback is used in the Wein Bridge oscillator 6. What is the gain of the Wein Bridge oscillator? 7. What are the applications of the Wein Bridge oscillator? 8. What is the condition for generating oscillations? 9. What is the difference between damped oscillations undamped oscillations? 10. Wein Bridge oscillator is either LC or RC oscillator. 11. What are the drawbacks in using Wein Bridge Oscillators?For the JFET shown in Figure, Determine the minimum value of VDD required to put the device in the constant-current region of operation when VGS = 0 V. where VGS(off) = - 4 and IDSS = 42mA