Analog Circuits Practice Test 8

1. In a CS amplifier, given that r_ds=0.5MΩ and g_m=5mΩ^-1, the load is 10kΩ, source resistance is 44 kΩ. Calculate the internal amplification factor for the small signal model.

2. What will be the oscillator frequency of Hartley oscillator if inductance L1, L2 are equal to 1mH and 2mH respectively and capacitor C is 10nF. (Neglect mutual inductance)

3. In a clapp oscillator with three capacitor C₁, C₂, C₃, C₁ is used as upper capacitor in voltage divider, C₂ is used as lower capacitor in voltage divider and C₃ is the third capacitor. For perfect operation which of these capacitor should have minimum value?

4. Choose the incorrect statement for JFET(s).

5. Which of the following equation gives amplitude of oscillation in Colpitts oscillator using the describing function method? (Where Ic is the is the bias current RL is the load resistor and C1 & C2 are the upper and lower capacitance of voltage divider bias)

6. Equivalent circuit of crystal oscillator contains ______________

7. In a clapp oscillator with three capacitor C₁, C₂, C₃, C₁ is used as upper capacitor in voltage divider, C₂ is used as lower capacitor in voltage divider and C₃ is the third capacitor. Inductance used in the circuit is L. The frequency of operation will be __________

8. If C1 and C2 are the capacitance used in Colpitts oscillator the effective capacitance in the equation of frequency calculation is equal to ___________

9. The crystal can be used to replace inductor in __________

10. The cut-off frequency of a JFET is that time when the magnitude of the input current is ___________