51. A Darlington stage is shown in the figure is, if the trans-conductance Q1 is gm1 and Q2 is gm2, then the overall trans-conductance gm is given by
52. The input Vi to the circuit shown in figure below is a square wave of amplitude ±1 V and frequency 100 Hz.
Assuming ideal components, the peak-to-peak amplitude of the output V0 is:
Assuming ideal components, the peak-to-peak amplitude of the output V0 is:
53. Which type of negative feedback is used to improve performance of current amplifier?
54. For 555 astable multivibrator, if C = 0.01 µF, RA = 10 kΩ, RB = 50 kΩ, the frequency and the duty cycle will be nearly.
55. The hybrid-pi model is used for:
56. Consider an inverting amplifier with a feedback resistor R2 = 10 kΩ and an op-amp with parameters; AoL = 105 and Ri = 10 kΩ. Assuming the output resistance R0 of the op-amp is negligible, the closed-loop input resistance at the inverting terminal of an inverting amplifier will be nearly:
57. A source follower (using a FET) usually has a voltage gain which is
58. In the Hybrid-pi model for the BJT small signal analysis, rπ denotes
59. For the circuit shown in figure, the transistor parameters are VBE = 0.7 V , β = 99. If VC is to be set at 7.5 V, the required value (in kΩ) of RB is
60. Which one of the following is a wide band amplifier?
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