1
GATE ECE 2001
MCQ (Single Correct Answer)
+1
-0.3
The current gain of a BJT is
A
$$g_mr_o$$
B
$$\frac{g_m}{r_o}$$
C
$$g_mr_\mathrm\pi$$
D
$$\frac{g_m}{r_\mathrm\pi}$$
2
GATE ECE 2000
MCQ (Single Correct Answer)
+1
-0.3
Introducing a resistor in the emitter of a common amplifier, stabilizes the dc operating point against variations in
A
only the temperature
B
only the β of the transistor
C
both temperature and β
D
none of the above
3
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The emitter coupled pair of BJT’s gives a linear transfer relation between the differential output voltage and the differential input voltage Vid only. When the magnitude of Vid is less than '$$\alpha$$' times the thermal voltage, where '$$\alpha$$' is
A
4
B
3
C
2
D
1
4
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
From a measurement of the rise time of the output pulse of an amplifier whose input is a small amplitude square wave, one can estimate the following parameter of the amplifier:
A
gain-bandwidth product
B
slow rate
C
upper 3-dB frequency
D
lower 3-dB frequency
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