(a) The open-loop low-frequency voltage gain of an amplifier is
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Microelectronics: Circuit Analysis and Design
- 3. Inverting Amplifier is a normal OP-Amp in which the output is given as feedback with a feedback resistor. i. Draw a circuit diagram for the inverting amplifier. Derived the expression for the closed loop gain for the inverting amplifier. iii. In an inverting amplifier input resistance (R1) =2.2 k2 and feedback resistance 220kN. Calculate the closed loop gain for the inverting amplifier.arrow_forward1. TRUE OR FALSE . (a) The closed loop gain of a negative feedback amplifier is less than its open loop gain.(b) For a voltage amplifier, the input impedance and output impedance should be very high.(c) For a transconductance amplifier, the input impedance should be very low and the output impedance shouldbe very high.(d) For a voltage amplifier, the output voltage on the load decreases if the output impedance of the amplifierincreases.(e) For a current amplifier, the output current on the load decreases if the output impedance of the amplifierincreases.arrow_forwardWhat are the advantages of positive feedback amplifier?arrow_forward
- Consider the series-shunt feedback amplifier of Figure below. Assume that the voltage divider (R1, R2) is implemented with a 1-MQ potentiometer. Assume that the MOSFET is biased so that gm 4 mA/V and r, is large. Also, Rp = 10 k. A VDD Find the value of R1 that results in a closed-loop gain of 5 V/V. Rp R2 R1 V,arrow_forwardIdentify the feedback system topology of the amplifier circuit as shown in Figure 4. Determine: V. the open loop gain, A = Vi i. Vf ii. the feedback gain, B Vo Vo iii. the gain with feedback, Af Vs iv. the expression of A, for Aß » 1 Vdd Rd + R2 Vo Vf R1 +arrow_forwardAn inverting amplifier is to be designed with a gain of 5 and an input impedance of 10k ohms. What should be the value of the feedback resistance?arrow_forward
- Discuss the difference between the current series negative feedback amplifier and voltage shunt feedback amplifier in terms of output impedance, input impedance, voltage gain, bandwidth, distortion and noise.arrow_forwardFor the collector feedback configuration of Figure a. Determine re. b. Find Zi and Zo. c. Calculate Av. 12 V 3.9 k2 220 k2 V; o Z, B= 120 ro = 40 k2 Z;arrow_forwardQ3 a) Show that negative feedback can reduce the sensitivity of an amplifier circuit, by deducing the expression of dAd/dAo]- b) Figure Q3.b shows a discrete transistor feedback configuration. Vcc RC RF O vo Vi Rs Figure Q3.b 1) Identify the feedback topology of this configuration. 2) What type of amplifier is this configuration? How the feedback can affect its input and output resistances? 3) Draw the small-signal equivalent circuit and derive the closed loop transfer function. c) Copy the following table into your answer book and complete it with either 'infinite' or 'zero'. Please note that table is for ideal amplifiers. Input Resistance Output Resistance Voltage amplifier Current amplifier Transresistance amplifier Tranconductance amplifierarrow_forward
- solve a,b and c please. a. Define on-off ratio. Why series JFET has higher on-off ratio as compared to shunt JFET? b. Compare inverting and non-inverting amplifier? c. calculate the closed loop gain of the circuit diagram given below.arrow_forward2-) The AC equivalent of a feedback amplifier circuit is given in the figure on the right. (Hfe100, Va = ∞, Ic1 = 15 mA, Ic2 = 5mA and Ic3 = 5 mA) a) State the type of feedback used in the circuit, explaining the reason. b) Draw the small signal equivalent of the amplifier circuit. c) Calculate the value of β for the feedback by drawing the β circuit. d) Find the Avf = Vo / Vs closed loop gain of this circuit. e) Find the Rif and Rof values.arrow_forwarda) Obtain the open-loop transfer function. Go to page: 12 he closed-loop transfer function.. c) Find the value of gain and closed-loop poles at the imaginary axis crossing:... d) Write the range of k for which the closed system is stable.......….. e) Write the value of k that makes the system marginally stable:... f) What would be the period of oscillation. g) Find %OS, Tp, Ts, atk = 15. h) Find the steady-state errors when the input is r(t)= 0.62 u(t) step at k=15:.. H(s)G(s): k (s + 7)(s +1-j)(s +1+j)arrow_forward
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