1) For the Wien oscillator (Figure 1), by assuming Ci=C2, a) Calculate the capacitor values such...

 

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1) For the Wien oscillator (Figure 1), by assuming Ci=C2, a) Calculate the capacitor values such that the oscillation frequency is fosc=1.6kHz. b) Calculate the required value of the variable resistor (Rp) to be adjusted for proper operation of the circuit. Also, discuss whether Rp should be slightly smaller or larger than this value, in order to guarantee the start-up (in order to prevent fading away) of oscillation. c) If Ci=C2 value is increased to ten times the value you found in (a), calculate the new fosc value. d) While Ci=C2 is having the value found in (a), assume an extra resistor of Rx=D10k2 connected in parallel with R1, i) What is the required value of Rp to be adjusted for porper operation? ii) What is the new oscillation frequency? 2) For the Schmitt-Trigger-based square-wave oscillator (Figure 2), by assuming the opamp's output saturation levels symmetrical (i.e. V.--V.'), a) Calculate the oscillation frequency fosc when the variable resistor is set to Rp=10ks2. b) If V,**-V, -13V, find Vout and Vin amplitudes. c) If R2 is changed to 100k2, how do fosc and amplitudes of Vout and Vin change? d) Frequency adjustment is preferred to be performed by changing Rp, but not R2 or R1. What is the advantage of this choice? C2 R2 10k2 C1 R1S 10k2 Vin -Vout 100 -Vout |Rp nF RA R1 R2 10k2í 10ko RB 15k2 22kΩ Figure 1 Figure 2 1) For the Wien oscillator (Figure 1), by assuming Ci=C2, a) Calculate the capacitor values such that the oscillation frequency is fosc=1.6kHz. b) Calculate the required value of the variable resistor (Rp) to be adjusted for proper operation of the circuit. Also, discuss whether Rp should be slightly smaller or larger than this value, in order to guarantee the start-up (in order to prevent fading away) of oscillation. c) If Ci=C2 value is increased to ten times the value you found in (a), calculate the new fosc value. d) While Ci=C2 is having the value found in (a), assume an extra resistor of Rx=D10k2 connected in parallel with R1, i) What is the required value of Rp to be adjusted for porper operation? ii) What is the new oscillation frequency? 2) For the Schmitt-Trigger-based square-wave oscillator (Figure 2), by assuming the opamp's output saturation levels symmetrical (i.e. V.--V.'), a) Calculate the oscillation frequency fosc when the variable resistor is set to Rp=10ks2. b) If V,**-V, -13V, find Vout and Vin amplitudes. c) If R2 is changed to 100k2, how do fosc and amplitudes of Vout and Vin change? d) Frequency adjustment is preferred to be performed by changing Rp, but not R2 or R1. What is the advantage of this choice? C2 R2 10k2 C1 R1S 10k2 Vin -Vout 100 -Vout |Rp nF RA R1 R2 10k2í 10ko RB 15k2 22kΩ Figure 1 Figure 2

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