Analog Circuit Design — Winter 2018

State the functions of the transistors connected to the reset and discharge pins of IC 555.

What is the role of the inter electrode capacitances Cbc, Cbe and Cce in a hybrid Π model? Why Cce does not figure in the model?

Define the following for an Op Amp: [1] Input Resistance [2] Slew Rate [3] Balanced output [4] PSRR [5] Voltage Gain [6] Offset Voltage [7] Unity Gain Bandwidth

Abipolar junction transistor has h =1 KΩ, h = 100; h ,h are negligible. ie fe re oe Cc=3pF and the collector current is 10mA. The short circuit current gain is 10 at a frequency of 10 M Hz. Calculate the values of f , f and f . α β γ

List all the resistances and their typical values in a hybrid Π model

Draw the hybrid Π model for a single stage CE transistor amplifier having load resistance Rand obtain the expression for short circuit current gain. L

Draw the hybrid Π model for a transistor in CE configuration and derive the expression for transconductance g . Justify the validity of this model. m

Perform DC analysis of a Dual Input Balanced Output Differential Amplifier

For a given operational amplifier, the input voltages are 150 μV and 140 μV DC. This amplifier has a differential gain of 4000 and a CMRR of 100. Evaluate its output voltage. What change would occur in its output voltage if the CMRR changes to a new value of 1,00,000 ?

Define CMRR. Discuss the effect of Ron CMRR. How can a constant E current source and a current mirror circuit help to improve this value?

For a dual input balanced output, it is given that V = +12V, R =4.7 KΩ, CC C R = 100Ω and R = 2.7 KΩ. Evaluate its Quiescent point of operation. B E

What is the significance of Slew Rate? How does it affect the performance of an Op Amp?

Explain the working of an adder and a Subtractor circuit to perform the mathematical operation V =V +Vand V =V -Vrespectively. O 1 2 O 1

What are precision rectifiers? Explain the working of anyone of them.

How does the working of an operational amplifier differ in inverting and noninverting configurations?

Discuss op amp based triangular waveform generator circuits. Obtain the expression for the same. OR1

For IC 555, explain the functions of the following pins: [1] Trigger [2] Threshold [3] Control

What is thermal drift and error voltage? Suggest methods to reduce the same.

Explain the compensation of input offset voltage with a neat diagram.

Draw the block diagram of PLL and explain each block.

Discuss the features of LM317 Regulator.

Derive expression of frequency of oscillation of an RC phase shift oscillator.

Derive the expression for filter transfer function of a first order low pass filter and draw its frequency response characteristics.

Discuss any one application of a PLL in modulation signal detection.

Derive expression of frequency of oscillation of a Wein Bridge oscillator.