GATE 2023 Analog Circuits Quiz 58

For a BIT if C_u = 10 nF &  then the value of unity gain frequency f_T of transistor with trans conductance g_m = 30 mS is equal to

A transistor with npn configuration has a capacitance of 0.4 pF. The cut off frequency when the gain is unity is 800 MHz. The collector current used as biasing is 2 mA. The value of C_π (in pF) at room temperature is______.

A transistor amplifier circuit parameter at I_c = 2 mA has internal capacitance C_μ = 1 pF and
C_π = 10 pF with β = 150 and V_T = 25 mV. The value of F_T i.e. unity gain frequency is______GHz.

If R_S=10kΩ (resistance of source voltage) and R_G=30kΩ then calculate the value of cut-off frequency( in Hz) of the 1^st order high pass filter due to C₁. Here value of C₁ is 2μF.

For the voltage amplifier circuit shown in the figure, A_v is very high. Also R_S = 1mΩ, R_L = 1kΩ R₁ = 1 kΩ and R₂ = 1MΩ

Then what is the value of |V_o/V_s| = ?

Consider the JFET amplifier circuit with feedback shown in figure below,

The gain on the amplifier without feedback is A, and β is the feedback factor of the feedback network, assuming |Aβ| >>1 and the value R₁ = 80 kΩ and R₂ = 20 kΩ, then the approximate gain of the circuit will be