Analog Electronics - Study Mode

[#216] For an OPAMP, unity gain frequency is 10 6 if gain is 20, What is the Bandwidth of the op-amp . . . . . . . .
Correct Answer

(B) 50 kHz

[#217] The cross-over distortion in class B push-pull amplifier is eliminated by
Correct Answer

(D) Reducing the biasing of the transistors

[#218] The transfer function of a second order low pass filter shown in Figure is
Correct Answer

(A) $$frac{1}{{{{ ext{R}}^2}{{ ext{C}}^2}{{ ext{s}}^2} + 3{ ext{RCs}} + 1}}$$

[#219] For a bipolar junction transistor, if the current amplification factor and cut-off frequency in the CB mode are α CB and fα CB respectively, then the cut-off frequency in the CE mode is equal to
Correct Answer

(C) $$frac{{{ ext{f}}{alpha _{{ ext{CB}}}}}}{{1 - {alpha _{{ ext{CB}}}}}}$$

[#220] In the circuit shown below, the silicon npn transistor Q has a very high value of β. The required value of R 2 (in kΩ) to produce I c = 1 mA is
Correct Answer

(C) 40