The high input impedance of Field Effect Transistor (FET) amplifier is due to

Consider the following statements (a) BJT is a current controlled device with high input impedance and high gain band width (b) FET is a voltage- controlled device with high input impedance and low gain bandwidth (c) UJT is a negative resistance device and can be used as an oscillator (d) FET and UJT can be used for amplification Which of the above statements are correct

A

(a) and (b)

B

(b) and (c)

C

(c) and (d)

D

(a) and (d)

Of the four characteristic given below, which are the major requirements for an instrumentation amplifier? P: High common mode rejection ratio Q: High input impedance R: High linearity S: High output impedance

A

P, Q and R only

B

P and R only

C

P, Q and S only

D

Q, R and S only

Which of the following can be considered to be an advantage of FET amplifier as compared to BJT amplifier? A – Higher input impedance B – Good bias stability C – Higher gain-bandwidth product D – Lower noise figure Select the correct answer using the codes given below Codes:

A

A, B and C

B

A, B and D

C

B, C and D

D

A, C and D

For an instrumentation amplifier, the following parameters are given (a) High input resistance and low power consumption (b) Low input resistance and low power consumption (c) High CMRR and high slew rate (d) Low CMRR and high slew rate Which of the given parameters are a major requirement for an instrumentation amplifier?

A

(a) and (d)

B

(b) and (c)

C

(a) and (c)

D

(c) and (d)

In the following figure, the transmitter Tx sends a wideband modulated RF signal via a coaxial cable to the receiver Rx. The output impedance ZT of Tx, the characteristic impedance Z0 of the cable, and the input impedance ZR of Rx are all real. Which one of the following statements is TRUE about the distortion of the received signal due to impedance mismatch?

A

The signal gets distorted if Z_R ≠ Z₀, irrespective of the value of Z_T

B

The signal gets distorted if Z_T ≠ Z₀, irrespective of the value of Z_R

C

Signal distortion implies impedance mismatch at both ends: Z_T ≠ Z₀ and Z_R ≠ Z₀

D

Impedance mismatches do NOT result in signal distortion but reduce power transfer efficiency

Which of the following are the characteristics of a Junction Field Effect Transistor? 1. High input resistance 2. Good thermal stability 3. High current gain 4. Noisier than bipolar junction transistor

A

1 and 3

B

1 and 2

C

2 and 3

D

3 and 4

Consider the following statements regarding a differential amplifier using an FET pair. The differential output offset voltage is due to: 1. Mismatch between FET parameters 2. Difference between the values of resistors used in the circuit even though they are marked nominally equal 3. Variation in the operating voltage of the circuit Which of the above statements are correct?

A

1, 2 and 3

B

2 and 3 only

C

1 and 3 only

D

1 and 2 only

After conjugate impedance matching the input impedance used for matching after normalization was 1+j with the characteristic impedance of the transmission line being 100Ω, then the generator impedance must have been:

A

100+100j

B

1+j

C

100-100j

D

1-j

How the input impedance of a common emitter transistor amplifier expressed in terms of transistor hybrid parameters?

A

hie – (hfe × hoe / YL + hre)

B

hie + (hfe × hoe / YL + hre)

C

hie – (hfe × hre / YL + hoe)

D

hie + (hfe × hre / YL + hoe)

How the input impedance of a common base transistor amplifier expressed in terms of transistor hybrid parameters?

A

-hib + (hfb × hib / YL + ho

B

[ hib – (hfb × hib / YL + ho[

C

-hib + (hfb × hrb / YL + hob)

D

hib – (hfb × hrb / YL + hob)

The high input impedance of Field Effect Transistor (FET) amplifier is due to

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