Analog Electronics - Study Mode

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[#261] One of effect of negative feedback in amplifier is to

(A) Decrease the harmonic distortion

(B) Increase the harmonic distortion

(C) Decrease the bandwidth

(D) Increase the noise

Correct Answer

(A) Decrease the harmonic distortion

[#262] Output characteristics of a BJT amplifier is given. Find the minimum collector current required for r 0 = 50 kΩ. (r 0 is output resistance)

(A) 1 mA

(B) 5 mA

(C) 10 mA

(D) 100 mA

Correct Answer

(A) 1 mA

[#263] An N-Channel JFET has I DSS = 8 mA and V p = -5 V. The minimum value of V DS for pinch-off region and the drain current I DS for a V GS = -2V are.

(A) 3 V and 2.88 mA

(B) -5 V and 1.88 mA

(C) -2V and 3.12 mA

(D) -7 V and 1.98 mA

Correct Answer

(A) 3 V and 2.88 mA

[#264] From 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) Upper-3-dB frequency

(C) Lower-3-dB frequency

(D) Slew-Rate

Correct Answer

(B) Upper-3-dB frequency

[#265] A monolithic metal oxide semiconductor (MOS) non-polarized capacitor which is a parallel plate capacitor with SiO 2 as dielectric. A surface thin film of metal (aluminum) is the top plate. The bottom plate consists of the heavily doped n* region that is formed during emitter diffusion. What is the typical value of
capacitance for an oxide thickness of 500 Å of this MOS capacitor? Take the permittivity of dielectric (ε r ) as 4.

(A) 0.1 pF/mil 2

(B) 0.2 pF/mil 2

(C) 0.3 pF/mil 2

(D) 0.4 pF/mil 2

Correct Answer

(D) 0.4 pF/mil 2