Analog Electronics

What is clipper and clamper circuits? Explain briefly.

Differentiate BJT with FET?

What are the two mechanism of breakdown in P-N Junction diode?

What are the characteristics of an ideal OP-AMP?

Differentiate voltage amplifier with power amplifier?

A Ge transistor with $\alpha =0.98$ gives a reverse saturation current $I_{CO}=10\mu \text{A}$ in CB configuration. When transistor used in CE configuration with a base current of $0.22\text{mA}$, calculate the collector current?

What is Bias stabilization?

What are the types of analog to digital converter? Which analog to digital converter is best for conversion?

What is the difference between enhancement and depletion MOSFET?

Why is Zener diode used as a voltage regulator?

Draw the V-I characteristic of P-N Junction diode and show how temperature change affect the characteristics?

Define the following with respect to performance characteristic of ADC – (a) Resolution (b) Accuracy

A class A power amplifier uses a transformer as a coupling device, the transformer has a turn ratio of 10 and the secondary load is 10 ohm. If the zero signal collector current is 100mA, find the maximum output power.

Draw the high frequency equivalent circuit of an emitter follower and derive the expression of voltage gain for the same.

Explain current mirror, its basic topology and its variants.

Explain low frequency analysis of multi stage amplifiers.

What are the different analog to digital conversion techniques? Explain any one of them in detail.

(a) Draw the circuit of OP-AMP integrator and derive the output expression. (b) A $10\text{mV}$, $2\text{kHz}$ sinusoidal signal is applied to the input of OP-AMP integrator for which $R_1=100\text{k}\Omega$ and $C=1\mu \text{F}$. Find the output voltage.

(a) Describe concept of stability and gain margin. (b) What is meant by cross-over distortion in class B amplifier? Explain, how it is over come in class AB operation?

(a) Explain, how OP-AMP can be used as a zero crossing detector. (b) A JFET has $V_P=-4.5\text{volt}$, $I_{DSS}=10\text{mA}$ and $I_{DS}=2.5\text{mA}$. Determine the transconductance.

(a) Define filter. What is the difference between active and passive filters? (b) A transistor with $\beta =45$ is used with collector to base resistor $R_B$ biasing with quiescent value of 5 volt for $V_{CE}$. If $V_{CC}=24\text{ volt}$ $R_L=10\text{k}\Omega$, $R_E=270\Omega$, find the value of $R_B=?$ Refer to the circuit diagram: $V_{CC}$ connected to collector through $R_L=10\text{k}\Omega$, base connected to collector via $R_B$, emitter connected to ground via $R_E=270\Omega$.

Write short notes on any two – (a) Triangular – wave generators (b) Differential amplifiers (c) Instrumentation amplifiers