LICA QUESTIONS FOR MID 2

LICA IMPORTANT QUESTIONS

1. Draw the circuit diagram for second order low pass filter and derive the expression for upper       

    cutoff frequency of the filter. Also design the filter if the cut off frequency is to be 2KHZ.    

   Assume suitable data.

2. Design a wide band reject filter using first order high pass and low pass filters having f_L = 2    

    KHz and f_H = 400Hz respectively, With A Pass Band Gain of 1.

3. Draw the circuit diagram of an antilogarithmic amplifier using op-amps and explain its  

    operation.

4. For the All pass filter determine the phase shift Ø between the input and output at f=2 KHz.

    To obtain the positive phase shift Ø what modifications are necessary in the circuit?

5. Define important performance specifications of Digital to Analog converters.

6. Describe the operation of R-2R ladder type DAC.

7. Sketch the logarithmic amplifier circuit using op amp and explain with suitable expressions.

8. Draw the Op-amp based astable multi vibrator circuit and explains its functionality in detail?

9. Explain successive approximation ADC with the help of block diagram. Also illustrate

   Conversion process.

10. Draw a band - pass filter circuit with its frequency response curve. Explain its working.

11. Design a first order wide band reject filter with a higher cutoff frequency of 100Hz and a

       lower cutoff frequency of 1kHz. Calculate the Q of the filter.

12. Sketch and explain the transfer characteristic of a DAC with necessary equations.

13. LSB of a 9 - bit DAC is represented by 19.6mv. If an input of 9 zero bits is represented by 0

     volts.

     i. Find the output of the DAC for an input 10110 1101 and 01101 1011.

     ii. What is the Full scale reading (FSR) of this DAC?

14. Write a short note on triangular wave generator using square wave generator?

15. Draw the block diagram of successive approximation ADC and explain the operation ion detail?