Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III LINEAR AND DIGITAL IC APPLICATIONS Previous Question Paper (March - 2021 - R13)
Answer any five questions. All questions carry equal marks.
Main
Draw and explain the operation of op-amp as an integrator.
Answer
An op-amp integrator is a circuit that performs the mathematical operation of integration on an input signal. It consists of an op-amp with an input resistor R connected to the inverting terminal and a feedback capacitor C connected between the output and the inverting terminal, while the non-inverting terminal is grounded.
The output voltage Vo is given by the expression:
Operation: When an input voltage Vin is applied, current I = Vin / R flows through the input resistor. Since the op-amp input impedance is very high, this current flows entirely into the feedback capacitor. The charge Q on the capacitor changes at a rate proportional to the input current, causing the output voltage to change at a rate proportional to the input voltage. Thus, the output is the integral of the input signal, inverted in polarity.
Explain the operation of inverting and non-inverting comparator.
Answer
A comparator compares an input voltage with a reference voltage and produces a high or low output indicating which is greater. It operates in open-loop mode, utilizing the high open-loop gain of the op-amp to drive the output to saturation levels (+Vsat or -Vsat).
Inverting Comparator: The input signal Vin is applied to the inverting terminal (-), and the reference voltage Vref is applied to the non-inverting terminal (+). If Vin < Vref, the output is +Vsat. If Vin > Vref, the output is -Vsat.
Non-Inverting Comparator: The input signal Vin is applied to the non-inverting terminal (+), and the reference voltage Vref is applied to the inverting terminal (-). If Vin > Vref, the output is +Vsat. If Vin < Vref, the output is -Vsat.
With a neat diagram explain the operation of sawtooth waveform generator.
Answer
Sign in to view the complete answer paper.
Design a narrow band pass filter using op-amp. The resonant frequency is 100Hz, Q=3 and C=0.01μf.
Answer
Sign in to view the complete answer paper.
Explain how PLL is used as AM detector and FM modulator.
Answer
Sign in to view the complete answer paper.
Explain how IC 555 is used for Astable multivibrator?
Answer
Sign in to view the complete answer paper.
Explain about ladder type DAC with neat diagram. Also discuss the specifications of DACs.
Answer
Sign in to view the complete answer paper.
Explain the working of Dual slope ADC with a neat diagram.
Answer
Sign in to view the complete answer paper.
Compare various Logic families in all aspects.
Answer
Sign in to view the complete answer paper.
Design a driving circuit for LED and which 74XX series IC is used for it.
Answer
Sign in to view the complete answer paper.
With neat circuit diagram explain the working of a 4-bit odd parity generator.
Answer
Sign in to view the complete answer paper.
Design a 5 × 32 decoder using 3 × 8 decoder and summarize how many decoders are required for this design.
Answer
Sign in to view the complete answer paper.
Design a mod-8 counter using right shift register. Use D-flip flop to build register circuit.
Answer
Sign in to view the complete answer paper.
Design a synchronous counter using 74XX ICs and explain its working with neat timing waveforms.
Answer
Sign in to view the complete answer paper.
With a neat diagram explain the architecture of ROM.
Answer
Sign in to view the complete answer paper.
Explain the operation of PIPO and SIPO with neat diagrams.
Answer
Sign in to view the complete answer paper.