Voltage-controlled oscillator (VCO) is: O a. an amplifier that is used to increase the loop gain and thus decrease the steady-state phase error. O b. a frequency modulator in which the frequency deviation of the output is proportional to the VCO input signal. O C. a mixer followed by a LPF that is used to determine the phase error. O d. None of the answers

Voltage-controlled oscillator (VCO) is: O a. an amplifier that is used to increase the loop gain and thus decrease the steady-state phase error. O b. a frequency modulator in which the frequency deviation of the output is proportional to the VCO input signal. O C. a mixer followed by a LPF that is used to determine the phase error. O d. None of the answers

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Analogue 2
Q. One advantage of having feedback in op amp circuit is A. low gain B. low bandwidth C. can control gain D. high output voltage E. less input signal F. less complicated
3A
3) The region where an amplifier is operating in a linear format is represented by: a) The positive feedback b) The common feedback c) The negative feedback 4) For oscillator operation the noise traveling around a loop, then being amplified as converging on a sine wave at: a) Two different frequencies b) Several frequencies c) Single frequency
Hand Calculation: 1. For different configurations shown in Figure 1, perform approximate hand calculations assuming that the operational amplifier is ideal. In each case sketch the expected output waveform in Table I. Assume that the sine and triangular waves have amplitude of 1V, the square wave varies from 0 to 5V with 50% duty cycle, and frequency of all signals is set to 1kHz. 2. Redesign the integrator circuit so that when the input is sine wave with frequency 1kHz the output voltage will have same amplitude. Use C=0.1μF. 3. Redesign the differentiator circuit so that when the input is sine wave with frequency 1kHz the output voltage will have same amplitude. Use C=0.1μF.
slove 5 (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? 3 3 Build a Wein-Bridge oscillator using, C=1µF and +10V power supply to produce 10 kHz sinusoidal waveform. Generate your plots and compare output results. Highlight any discrepancies 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 RC oscillators. How can you modify the circuit to include a crystal in you circuit. What is a typical application of such an oscillator? 5 Discuss the…
(b) Figure Q3(b) shows a phase shift oscillator circuit. Given the feedback gain: V1 1 = (s)g V2 (sRC)3 + 5(sRC)² + 6(sRC) +1 R2 R1 ww V2 ww Figure Q3(b) (i) Determine an equation for frequency of oscillation. Calculate the value of capacitors, C, if the output voltage is equal to 5 sin 3t V and resistor, R is equal to 100 k. (ii) (iii) Calculate the open-loop gain, A, in order to generate an oscillating signal. Determine the value for R1and R2 in order to generate an oscillating signal. You may refer to the Appendix in page 5 and 6 for the commercial value of resistor. (iv)
Analogue electronics 2
Figure 3 shows a Hartley oscillator. Assume that the op-amp employed in the figure is an ideal op-amp, and R1= 20 kΩ, R2 = 60 kΩ, L1=10 mH. b) State the Barkhausen criterion for sustained oscillation.c) Explain briefly how the phase shift requirement for sustained oscillation ismet in the circuit of Figure 3.d) The feedback ratio and oscillation frequency of Figure 3 are givenrespectively by, B = -L2/L1 and w0 = 1 / sqrt(L1 +L2)C Determine the values of C and L2 in order for the circuit to oscillate at a frequency of 200 Hz.
1st question
If in the oscillator block diagram shown in Figure, = 0.1V, A = 100 and m = 0.01, then the circuit will. V₁ mVo Voltage Gain A Feedback Circuit V
Given the four statements, which of the following statements are not true about the operation of an op-amp? i. Op-amp's close loop operation employs negative feedback that takes portion of the output and applies it back out of phase with the input. 1i. In an op-amp, amplification of the common input signals is much less than that of the opposite input signals. iii. In open-loop operation, the output of the op-amp is driven to saturation with Vo- +Vsat. iv. Op-amp's close loop operation employs positive feedback that takes portion of the output and applies it back out of phase with the input. O i, iii, iv O i, iv O i i, ii O i, iv