List of top Analog and Digital Electronics Questions on Amplifiers asked in GATE EE

A continuous-time periodic signal \( x(t) = 1 + 2 \cos(4\pi t) + 2 \cos(6\pi t) \). If \( T \) is the time period of \( x(t) \), then \[ \frac{1}{T} \int_0^T |x(t)|^2 \, dt = \ \_\_\_\_\_? \]

The current gain \( \left( \frac{I_{out}}{I_{in}} \right) \) in the circuit with an ideal current amplifier given below is

The output impedance of a non-ideal operational amplifier is denoted by \( Z_{out} \). The variation in the magnitude of \( Z_{out} \) with increasing frequency, \( f \), in the circuit shown below, is best represented by:

For an ideal MOSFET biased in saturation, the magnitude of the small signal current gain for a common drain amplifier is

In the BJT circuit shown, beta of the PNP transistor is 100. Assume \(V_{BE} = -0.7\text{ V}\). The voltage across \(R_C\) will be 5 V when \(R_2\) is \(\underline{\hspace{1cm}}\) k\(\Omega\). (Round off to 2 decimal places.)