GATE 2023 Analog Circuits Quiz 8

The common emitter circuit, with bypass capacitor removed, is shown in Fig. The h_fe = 75, h_oe = 1μs, h_re = 0, h_ie= 2.1kΩ

Find the input impedance, Z_in (in kΩ).

Consider the feedback circuit shown in figure.

The feedback network used in the circuit has …………………… type of feedback topology.

An input voltage as shown is applied to the given circuit, which produces a half-wave rectified output.
 
Determine the percentage drop in the dc level, if the ideal diode is replaced by a silicon diode.

In below figure, both transistors are identical and have a high value of 'β', V_BE =0.7V and V_T = 25 mV. The small signal low frequency voltage gain A_V = (V₀/V_i) is equal to

Calculate the input resistance R_i (in ohms) of the common base amplifier shown.

(consider C₁, C₂ to very large)

(choose R_E = 1kΩ, R₁ = 18kΩ,

R₂ = 18kΩ, β = 99, r_π =1kΩ, R_C = 5kΩ, V_CC = 15V)