4. In the circuit shown below, a parallel RC network creates a frequency-dependent feedback path ...
4. Consider the common-emitter amplifier of Figure 5. Draw the dc circuit and find「CQ. Draw the dc circuit and find ICQ. Find the value of r. Then, calculate values for Voltage gain Av, Open circuit voltage gain Avoc, input impedance Zin, current gain Ai, power gain G, and out- put impedance Zo. Assume operation in the frequency range for which influence of coupling and bypass capacitors can be ignored. +15 V +15 V s in 100Ω CE Figure 5
TE Question 5 (20 marks) An active filter circuit is shown in Fig. 4. The cut-off frequency of this active filter is 1590Hz. The Input impedance and voltage gain of this filter are 10k0 and -5VN respectively Vout R1 vin R2 C1 Fig. 4 By assuming the operational amplifier, A is ideal, answer the following questions: (a) () State the type of this active fiter. (i) Explain the characteristic of this active filter. [2 marks] 3 marks] (b) 0) Calculate...
4. A non-inverting amplifier shown below is to be constructed with a uA 741C Op. Amp. It is to have a gain of 1001 with R1=100 ohms. Assume the GBP (non- inverting) = 100 kHz (a) Specify value of the resistor R2. (b) Sketch the Bode plot for this amplifier using specific numerical values and indicate the cut-off frequency. R2 R w B Op-amp + + o V HU TH
4. A non-inverting amplifier shown below is to be constructed with a uA 741C Op. Amp. It is to have a gain of 1001 with R1=100 ohms. Assume the GBP (non- inverting) = 100 kHz (a) Specify value of the resistor R2. (b) Sketch the Bode plot for this amplifier using specific numerical values and indicate the cut-off frequency. R2 R w B Op-amp + + o V HU TH
4. A non-inverting amplifier shown below is to be constructed with a uA741C Op. Amp. It is to have a gain of 1001 with R1=100 ohms. Assume the GBP (non- inverting) = 100 kHz (a) Specify value of the resistor R2. (b) Sketch the Bode plot for this amplifier using specific numerical values and indicate the cut-off frequency. R R1 B Op-amp + +o VO TH
(b) If the op-amp is realized by the circuit shown in Fig. 4( find the low-frequency gain and estimate the dominant pole pi as a function of the appropriate small-signal parameters and capacitor values. The unity-gain buffer has very high input resistance and very low output resistance. Assume that the voltage gain of the 2nd stage is very large and make any appro priate approximations. Then find the expression for the unity-gain frequency assuming that it is well within the...
A21921 2. +9V Re Vout Re RE CE 0v Figure 3 (a) ) State the purpose of each of the capacitors Cin, Cout and Ce in the circuit [3 shown in Figure 3. (i) Derive an expression for the input resistance of this circuit in terms of the [5 mutual conductance of the transistor gm and its current gain β. we require an amplifier with a gain of-100, an output impedance of 1kΩ and an input impedance of 1k2. The...
4. For the oscillator circuit shown below, the amplifier is an with trans-resistance gain Rm Vo frequency of oscillator and minimum trans-resistance gan (15pts) (Hint: ideal tr short the input terminal to ground) ideal trans-resistance amplifier out /I. Apply the Barkhausen criterion to determine the Rm needed f0τ oscillation. resistance amplifier has zero input impedance, which effectively C R 2C I Trans-resistanceKww Vout amplifier Rm 4. For the oscillator circuit shown below, the amplifier is an with trans-resistance gain Rm...
Voc Ri Rc C2 + RS G Q2N3904 RL Vout 2 R2 RE CE Rin Rout Cu B 1x B C o + V be : Cr 8m'be E VCC R R2 Rc RE RS RL С. Cz CE 12 V 8.2 kg 3.9 ko 6.3 k2 3.3 kΩ 3 ko 3.9 ko 10 uF 1uF 100 u Assume the 2N3904 has a 8 =100, Veron} = 0.7V, VA= 100V, C=100, C=13.9pF and Ce=8pF. Use the emission coefficient as n...
please answer all spring 2019 Name 19. Gain Margin (dB) is: e1OdByb) 15dBa c) 20 d8; d) 35dB; e) 45d8 20. Phase margin (degree) is close to: a) 0; b) 45pe90) 135) e) 180 21. A MOSFET transistor gm 2m5, Cgs 2pF, Ced 0.5pF, its cut-off frequency, ft, is close to: a) 100 b) 300MHz ) 60OMH)1GHe) SGH 22. The cut-off frequency of a BIT with gm-40m5, r pi-2.5Kohm, r o-20Kohm, c mu 1pF and c pi is close to:...