Linear and Digital Integrated Circuits — DU B.Sc. (Prog.) Physical Science courses pertaining to Electronics Previous Year Question Papers

3. Attempt four questions in all including Question No. 1. 1. Attempt the following : (5x3=15) (a) The inputs of an OR gate are driven by waveforms A and B given below. Draw the output waveform for the gate. (b) Simplify the given expressions using Boolean algebra: (c) Define the terms CMRR for an operational amplifier. What is its significance? (d) Distinguish between a Decoder and Demultiplexer circuits? (e) Consider an Op-amp in open loop inverting configuration. The input to the circuit is a sinusoidal signal of frequency 1KHz and peak value 50 mV. Draw the output waveform. 2. (a) Explain the virtual ground condition in an op-amp circuit with suitable diagram. Derive the expressions for the gain of an operational amplifier in non-inverting configuration. (10) (b) In the circuit of given figure below: if, V. = -4V, Vo=-2V, Ve = +3V, R. = R, = R. = 4 KS and Vec = ‡15V. Assuming that the op-amp is initially nulled. Determine the output voltage Vo. (5) (a) Draw the logic circuit of a 4-bit multiplexer and write its truth table. Implement a 8 x 1 multiplexer using 4 x 1 multiplexers. (10) (b) Determine the sum of (1100), and (0101), by analyzing the logical operation of a four-bit parallel adder. 4. (a) What are synchronous and asynchronous counters? Draw the circuit diagram of a ring counter and explain its working. (b) For a 5-bit resistive divider determine the output voltage for a digital input of (10101),. Assume logic 0 = OV, and logic 1 = 10 V. (5) 5. (a) Write truth table for a J-K type flip-flop and explain the phenomena of racing. How does a master-slave configuration help in solving race around condition in J-K type flip-flop? (10) (b) Draw the Karnaugh-map for the given function and obtain the simplified the Boolean expression.