ELEX
In an ideal differential amplifier shown in the figure, a large value of (R_E):
Decreases the common mode gain only.
Increase both the differential and common-mode gains.
Increases the common mode gain only.
Decreases the differential mode gain only.
The Fourier transform of a conjugate symmetric function is always:
Real
Conjugate anti-symmetric
Conjugate symmetric
Imaginary
For a BJT, the common base current gain α = 0.98 and the collector base junction reverse bias saturation current I_CO = 0.6 μA. This BJT is connected in the common emitter mode and operated in the active region with a base drive current I_B = 20 μA. What is the collector current IC for this mode of operation?
1.0 mA
0.98 mA
1.01 mA
0.99 mA
The circuit in the figure is a:
Band-pass filter
Low-pass filter
Band-reject filter
High-pass filter
In a transconductance amplifier, it is desirable to have:
A large input resistance and a large output resistance
A small input resistance and a small output resistance
A small input resistance and a large output resistance
A large input resistance and a small output resistance
The impurity commonly used for realizing the base region of a silicon n-p-n transistor is:
Gallium
Boron
Phosphorus
Indium
Voltage series feedback (also called series-shunt feedback) results in:
Decrease in both input and output impedances
Increase in input impedance and decrease in output impedance
Increase in both input and output impedances
Decrease in input impedance and increase in output impedance
The input impedance (Zi) and the output impedance (Z₀) of an ideal transconductance (voltage controlled current source) amplifier are:
Zi = ∞, Z₀ = ∞
Zi = 0, Z₀ = 0
Zi = 0, Z₀ = ∞
Zi = ∞, Z₀ = 0
The cascade amplifier is a multistage configuration of:
CE–CB
CC–CB
CB–CC
CE–CC
The voltage e₀ is indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calculated?
Bias current of the inverting input only
Input offset current only
Both the bias currents and the input offset current
Bias current of the inverting and non-inverting inputs only
Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in:
Only the temperature
Only the β of the transistor
Both temperature and β
None of the choices
Crossover distortion behavior is characteristic of:
Class A output voltage
Class B output stage
Class AB output stage
Common-base output stage
Consider the following two statements:
Statement 1: Astable multivibrator can be used for generating square wave.
Statement 2: Bistable multivibrator can be used for storing binary information.
Only statement 1 is correct
Only statement 2 is correct
Both the statements 1 and 2 are correct
Both the statements 1 and 2 are incorrect
Generally, the gain of a transistor amplifier falls at high frequencies due to the:
Coupling capacitor at the input
Internal capacitance of the device
Skin effect
Coupling capacitor at the output
If for a silicon npn transistor, the base-to-emitter voltage (V_BE) is 0.7 V and the collector-to-base voltage (V_CB) is 0.2 V, then the transistor is operating in the:
Cutoff mode
Normal active mode
Saturation mode
Inverse active mode
In a negative feedback amplifier using voltage-series (i.e. voltage-sampling, series mixing) feedback:
Ri increases and R₀ decreases
Ri increases and R₀ increases
Ri decreases and R₀ decreases
Ri decreases and R₀ increases
An ideal op-amp is an ideal:
Current controlled current source
Voltage controlled current source
Voltage controlled voltage source
Current controlled voltage source
The most commonly used amplifier is sample and hold circuits is:
A unity gain inverting amplifier
A unity gain non-inverting amplifier
An inverting amplifier with a gain of 10
An inverting amplifier with a gain of 100
Negative feedback in an amplifier:
Increases frequency and phase distortions
Reduces gain
Reduces bandwidth
Increases noise
Choose the correct match for input resistance of various amplifier configurations shown below:
Configuration Input resistance
CB: Common Base LO: Low
CC: Common Collector MO: Moderate
CE: Common Emitter HI: High
CB – LO, CC – HI, CE – MO
CB – HI, CC – LO, CE – MO
CB – LO, CC – MO, CE – HI
CB – MO, CC – HI, CE – LO
A master-slave flip flop has the characteristic that:
Both the master and the slave states are affected at the same time
Change in the output immediately reflected in the output
Change in the output occurs when the state of the master is affected
Change in the output occurs when the state of the slave is affected
Given figure is the voltage transfer characteristic of:
An NOMS inverter with enhancement mode transistor as load
An NMOS inverter with depletion mode transistor as load
A BJT inverter
A CMOS inverter
The effect of current shunt feedback in an amplifier is to:
Increase the input resistance and decrease the output resistance
Increases both input and output resistance
Decrease the input resistance and increase the output resistance
Decrease both input and output resistance
For small increase in VG beyond 1 V, which of the following gives the correct description of the region of operation of each MOSFET:
N-MOSFETs is in triode and p-MOSFET is in saturation region
N- MOSFET is in saturation and p-MOSFET is in triode region
Both the MOSFETs are in saturation region
Both the MOSFETs are in triode region
The first dominant pole encountered in the frequency response of a compensated op-amp is approximately at:
100 MHz
1 MHz
10 kHz
5 Hz
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