(a) Consider a general feedback system with parameters
(b)
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Microelectronics: Circuit Analysis and Design
- a- Zero. b- Slightly different from zero. O Maximum positive or negative. d- An amplified sin wave. 9-Negative feedback reduces @ The feedback fraction. b- Distortion. c- The input offset voltage. d- The open-loop gain. 10-The input impedance of a current-voltage converter is Small. b- Large. c- Ideally zero. d- Ideally infinite. a- 11-In a linear op-amp circuit, the @ Signal are always sin wave. b- Op-amp does not go into saturation. c- Input impedance is ideally infinite. d- Gain-bandwidth product is constant.arrow_forward2. b) (i) Derive an expression for the differentiator using op-amp. (ii) Design a circuit to perform differentiation of an input signal that varies in frequency from 20HZ to about 2 KHz. (iii) If a sine wave of 0.5 V peak at 2 KHz is applied to the differentiator of part (ii), draw the output waveform.arrow_forwardPlease help: Design an RC phase shift oscillator to generate sinusoidal waveform of frequency 500Hz. Plot frequency response of the RC feedback path and show that the phase shift is 180deg and gain is ~1/29 at the frequency of oscillation. Modify the circuit to generate a sinusoidal waveform of frequency 5KHz.arrow_forward
- consider a sinusoid input with a peak amplitude of 2 mV. If the amplification gain A1 = 500 and k-0.125, the error (E) and the amplitude of the output waveform Vout of the feedback network are: R2 (a) Select one: O a. none of these O b. E=0.031m and Vout= 15.75mV O c. E= 127m and Vout= 15.75 O d. E=127m and Vout= 1Varrow_forwardAn alternative signal Vin=3sin(2π400t) is applied to the integrator circuit input designed with Op-Amp, which is given in the figure and fed with ±10V. Draw the waveform by analyzing the output voltage (Vo). Calculate the maximum and rms value of the output signal.arrow_forwardOne advantage of having feedback in op amp circuit is A.Can control gain B.less complicated C.less input signal D.low gain E.high output voltage F.low bandwidtharrow_forward
- 4. Op-Amp has (a)Single (b) Similar (c)Multiple (d)Differential 5. Write the formula for closed-loop voltage gain of inverting amplifier with feedback using of voltage gain and gain of the feedback circuit. (a)AF= A/(1+AB) (b)AF= -A/(1+AB) (c)AF=-B/(1+AB) (d)None of the m 6. Voltage shunt feedback amplifiers are also called as (a)Non-inverting amplifier with feedback (c)Inverting amplifier with feedback (b)Non-inverting amplifier without (d)Inverting amplifier without feed outputs.arrow_forward(a) Identify the correct answers 1. Virtual ground of an OP-AMP (a) Is formed only with negative feedback (b) Is always an AC ground, may occasionally be a DC ground (for PMOS) (c) Is coined as a terminology where the input signal splits equally between the terminals (d) Leads to the concept of almost zero difference between the two inputs (both DC and AC) using feedback 2. In an OP-AMP based circuit (a) Phase margin of the closed loop transfer function is a measure of stable operation (b) 45° is a desirable phase margin as it balances the frequency domain stability and the time domain settling optimally (c) Absolute open loop gain numbers are not that important, as long as they are large (d) 45° is only achieved when the RHP zero is placed on one of the poles 3. In a differential amplifier biased with a given tail current I, to increase the overdrive voltage by 2X without changing input capacitive loading, we should (a) Increase W by 2X and reduce L by 2X (b) Reduce W by 2X and…arrow_forward77.One condition for positive feedback is that the phase shift around the feedback loop must be _______°. 76.In order to start up, a feedback oscillator requires A. positive feedback greater than 1. B. unity feedback equal to 1. C. no feedback. D. negative feedback less than 1. 75.A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called A. an astable multivibrator. B. a voltage-controlled oscillator. C. a crystal oscillator D. a Hartley oscillator 74.Which of the following is required for oscillation? A. The phase shift around the feedback network must be 180º B. None of the above C. ßA > 1 D. Both ßA > 1 and the phase shift around the feedback network must be 180º.arrow_forward
- write forward paths and feedback paths.arrow_forward(25 m 1. The value of ... is a measure of noise rejection in the op-amp. 2. Phase shift oscillator is a ------------- feedback oscillator. 3. The main part in the Wien-bridge oscillator is the circuit 4. In Wien-bridge oscillator, - are used to control the closed loop gain of the oscillator. 5. The RC circuits in the phase shift oscillator give- phase shift 6. Oscillators are used in communication circuits to .......and ....... signals,arrow_forwardThe figure below shows a block diagram with multiple nested feedback loops which needs to be analyzed the functions Fi shown in the blocks are simplified representations of Fi(s). (a) determine a canonical feedback configuration with one feedforward and one feedback path, (b) determine the overall transfer function Y(s)/X(s). The individual steps are to be explained by redrawing necessary figures. Show your solution steps.arrow_forward
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