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02000EC204052004

Derive the frequency of oscillation of an RC phase shift oscillator using op-amp.

Also explain its working with suitable diagram.

Explain how a free running square wave form can be obtained using op-amps.
PART C

Answer any two full questions, each carries 20 marks.

Explain how a monostable multivibrator can be implemented with 555 IC with

relevant waveforms and functional diagram. Derive an expression for pulse

width.

Give the block diagram of IC566 VCO and explain its operation.

Discuss in detail any two applications of PLL.

Why is a current foldback protection circuit used in regulators? Explain with

suitable diagrams.

Illustrate the principle of operation of PLL with its capture range and lock range.

Explain the working of successive approximation ADC.

With a neat circuit diagram explain the working of a weighted resistor D/A

converter. Discuss how digital signal is converted into analog signal in a

weighted resistor DAC.

With a functional diagram, explain the principle of operation of Dual slope ADC.

Draw the circuit of a Schmitt trigger using 555 timer and explain its operation.

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