Which of the following electrical devices do you like the mo

Which of the following electrical devices do you like the most? A. Resistor B. Diode C. MOSFET D. BJT E. None of them 2) What is the gain of the following transresistance amplifier? A. 10V/V B. 1000V/V C. -10 Ohm D. 10000 Ohm 3) What is the input resistance of the following amplifier? A. 4kOhm B. 20Ohm C. 1mA D. infinity Ohm 4) What is the amount of current flowing out of the op-amp in the following circuit when v_i is 1V? Assume the op-amp is ideal. A. 5mA B. -50 muA C. 0A D. -5V 5) Consider an NMOS transistor with V_G = 5V, V_s = 2V, V_D = 3V, and V_1 = 0. 8V. In which of operation is the transistor? A. Triode B. Saturation C. Cutoff D. Active

Solution

ANSWER:

1. Choose any component. I prefer MOSFET. (Option C)

2. A = 10V/1mA = 10⁴ ohm (Option D)

3. R = 4V/1mA = 4k ohm (Option A)

4. I = (Vi - 0)/20k = 50 uA (Option B)

5. Vgs = 3V > Vt. Hence, MOS is switched on.

Vds = 1V

Vgs - Vt = 2.2 V

Since Vds < Vgs - Vt, the MOS is in triode region. (A)