(а) Figure Q1(a) shows an amplifier with negative feedback. Explain how does the inclusion of the negative feedback makes the overall gain to be less sensitive to the variations in the open-loop gain, A. S; + Σ Se A So Sib Figure Q1(a)
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- 3D Problem 1. (P1) Three op-amps are connected in cascade configuration. An 80 microVolts signal is connected to the non-inverting input of the first op-amp. Both the 2nd and 3rd op-amps operates as inverting amplifiers. All feedback resistors are 420 KOhms while the input resistances are 71.4kOhms, 19.1kOhms, and 14KOhms respectively. Determine the output of the third stage stage. a.9 V b.9000 mV c.79.2 V d.792 mV3G Problem 1. (P1) Three op-amps are connected in cascade configuration. An 80 microVolts signal is connected to the non-inverting input of the first op-amp. Both the 2nd and 3rd op-amps operates as inverting amplifiers. All feedback resistors are 420 KOhms while the input resistances are 71.4kOhms, 19.1kOhms, and 14KOhms respectively. Determine the output voltage of the second stage stage. a.-2640 mV b.-26.4 mV c.-1.2 mV d.26 V3A Problem 1. (P1) Three op-amps are connected in cascade configuration. An 80 microVolts signal is connected to the non-inverting input of the first op-amp. Both the 2nd and 3rd op-amps operates as inverting amplifiers. All feedback resistors are 420 KOhms while the input resistances are 71.4kOhms, 19.1kOhms, and 14KOhms respectively. 3H Determine the total gain of the circuit in Problem No. 1 (P1) a.792.105 b.9000 c.792 V d.792
- 3C Problem 1. (P1) Three op-amps are connected in cascade configuration. An 80 microVolts signal is connected to the non-inverting input of the first op-amp. Both the 2nd and 3rd op-amps operates as inverting amplifiers. All feedback resistors are 420 KOhms while the input resistances are 71.4kOhms, 19.1kOhms, and 14KOhms respectively. Determine the gain of the third stage stage. a.-22 b.22 c.-30 d.31Q1 (a) (b) Considering an op-amp, define what is meant by input offset voltage (Vos) and explain what causes it. Figure Qla shows an integrating amplifier with zero input. Derive an expression for the output voltage, Vo, and explain the effect that Vos will have on its operation. R W Vos C Figure Qla A •V₂(c) (d) Figure Figure Q1b shows an Op-amp with a bias current compensating resistor (Rp). R₁ V₂. Vp IB. R₂ W A • V₂ Figure Olb (i) Derive an expression for V. to quantify the effect of bias currents IB+ and IB-. [3] (ii) Explain how you would choose a value for Rp to reduce the output error due to the bias currents, IB+ and IB.. [3] Referring to an op-amp define what is meant by common-mode rejection ratio (CMRR) and explain the effect a finite CMRR would have on high-precision applications. [4] Page 2 of 7 Continued overleaf
- 3A Problem 1. (P1) Three op-amps are connected in cascade configuration. An 80 microVolts signal is connected to the non-inverting input of the first op-amp. Both the 2nd and 3rd op-amps operates as inverting amplifiers. All feedback resistors are 420 KOhms while the input resistances are 71.4kOhms, 19.1kOhms, and 14KOhms respectively. Determine the gain of the first stage. a.-15 b.16 c.15 d.-166. For common-source small-signal FETS, the output voltage is 180° phase shifted with respect to the Q 7. The operating cycle of a Class A amplifier is Q 8. The maximum efficiency of a Class B amplifier is Q 9. In analyzing op-amps, when the non-inverting input pin is at ground and the inverting input pin is also at 0 V for an AC signal, the technique is called as Q 10. is an op-amp application circuit which is useful in low pass filter circuits.3B Problem 1. (P1) Three op-amps are connected in cascade configuration. An 80 microVolts signal is connected to the non-inverting input of the first op-amp. Both the 2nd and 3rd op-amps operates as inverting amplifiers. All feedback resistors are 420 KOhms while the input resistances are 71.4kOhms, 19.1kOhms, and 14KOhms respectively. Determine the gain of the second stage stage. a.22 b.-30 c.-22 d.31
- Q) An amplifier has voltage 1 point gain with the feedback of 100. If the gain without feedback changes by 40% and the gain with feedback should not vary more than 8%, the values of open-loop gain and feedback ratio will be respectively given by *Given the feedback circuit below and assuming the voltage amplifier has gain A₂, input resistance R₁ and output resistance Ro, answer the following questions: + a. Loop gain b. Closed loop gain Re C. Input resistance d. Output resistance Rin м + RE A) Sketch the feedback small signal model of this circuit. (Hint: You may convert the input VIN and source resistance Rs to its Norton current equivalent if needed) B) Find the following in terms of the amplifier parameters and resistances R, and RF: RoutQ1: design an inverting op-amp circuit to form the weighted sum Vo = -(v1 + 4v2) .choose the values for R1, R2, and Rf so that for a maximum output voltage of 10 volt the current in the feedback resistor will not exceed 1 ma.