DSP IMPORTANT QUESTIONS

                                               UNIT-1

• 1..Define periodic signal and illustrate problems ?
• 2   Find the step response of a discrete-time LTI system whose difference equation is given by

              y(n)=y(n-1)+0.5y(n-2)+x(n)+x(n-1)

• 3.    Define and explain the following systems with an example: (i) Causual and non-causual   (ii) Time-invarient and time-varient
• 4.    Find the magnitude and phase response of the LTI system with

   h(n)=x(n)-x(n-1)

• 5.    Determine the causality and stability  of the following systems with impulse response (i). h(n)=3ⁿu(-n)   (ii). E²ⁿu(n-1)
• 6.    Define and explain the following discrete-time signals with necessary mathematical expressions :(i) periodic and aperiodic    (ii) Energy and power
• 7.    State and prove the frequency shifting property of DTFT.
• 8. Explain the digital signal processing &block diagram and classify  their signals?
• 9.   Discuss the frequency domain representation of linear time-in variant systems?
• 10.Determine the all systems with illustrate problems ?

                         

                                               UNIT-2

• 11Find the DFT of the following sequence using DIF FFT  x(n)={1,2,3,5,5,3,2,1}
• 12.  Find the inverse FFT of x[k]=[10,-2+j2,4,-2-2j]
• 13.Compute the DFTS of the sequence x(n)=2^-n where N=8 using DIT algorithm ?
• 14.  State and prove any four properties of  discrete fourier series (DFS) ?
• 15. Explain the significance of FFT algorithms. Draw the basic butterfly diagram for radix-2 DIT FFT ?
• 16. Find the linear convolution of the sequence x(n)={1,4,0,9,5} and h(n)={-3,-4,5,6,8} and related problems
• 17.State and prove the convolution properties of DFT ?
• 18.  How FFT algorithm improves the speed of computation? Explain with an example ?
• 19. Find the 4-point DFT of the sequence x(n)={2,1,3,4} by using DIF FFT algorithm ? also, plot its magnitude and phase spectra ?
• 20. Explain the procedure to compute 8-point DFT using DIT FFT algorithm ?
• 21. Distinguish between linear convolution and circular convolution ?
• 22. Develop a radix-2  DIT FFT algorithm for evaluating 4-point DFT . also draw its flow diagram ?

 

                                         UNIT-3

• 23. Explain Transposed Forms ?
• 24.Obtain the direct form I and direct form II and cascade form realization of the following system functions
•     y(n)=0.1y(n-1)+0.2y(n-2)+3x(n)+3.6x(n-1)+0.6x(n-2)  model problems ?

• 25.Obtain the parallel form realization for the IIR system described by the transfer function

   H(z)=3+3.6z^-1+0.6z^-3/1+0.1z^-1-0.2z^-2

• 26. Realize H(z)=1+0.6z^-2+0.2z^-1/3+5z^-1+4z^-2 using Direct form I and Direct form II structures
• 27. Compare Chebyshev filter and Butterworth filter
• 28.Obtain the cascade form realization for the recursive IIR system described by the transfer function H(z)=3+3.6z^-1+0.6z^-2/1+0.1z^-1-0.2z^-2
• 29.Explain the analog filter to Digital filter?
• 30.  Obtain the 4^th order transfer function of normalized Butterworth low pass filter ?
• 31.List out the requriements for conversion of stable analog filter into stable digital response ?
• 32. Find H(z),for a 3^rd order Butterworth filter using impulse invariant transformation method . Assume T=1 sec .

                                           UNIT-4

• 33.  Explain FIR filter design using windowing method
• 34.  Comparision of IIR & FIR filters ?
• 35.  Explain the need for the use of  window sequence in the design FIR filter. Describe the window sequence generally used and comparable properties ?
• 36.Write the characteristics of FIR Digital filters ?
• 37.Explain about  the basic structure of FIR system ?

• 38.Design of FIR Digital filters using window technique and frequency sampling  tech wave?

                                            UNIT-5

• 39.Explain different pipeline programming models that are adapted in DSP processor ?
• 40.Explain the cortex-M3 and cortex-M4 processors architecture and draw their block diagram ?
• 41. Explain memory access schemes in DSPs ?
• 42. Explain the memory interface block diagram for the TMS320C5X processor ?
• 43.What are the various addressing modes used in the TMS320C5X processor ?
• 44.  With examples explain the different addressing formats supported by DSP processor for various signal processing applications ?
• 45.Explain the following i) on-chip peripherals   ii)VLIW architecture    iii) special addressing modes
•  

IMPORTANT QUESTIONS

 

         VLSI  IMPORTANT QUESTIONS

                              UNIT - 1

1. 1)  Derive the relationship between drain and source current Ids versus drain to source voltage Vds in a non-saturation and saturation region?

• 2)   What are the involved in the given fabrication process? Explain with neat sketch  i)nmos  ii)pmos  iii)cmos
• 3)   Compare Bicmos technology with other technologies?
• 4)   Design a stick diagram for  i)nmos logic Y=(A+B+C)whole bar   ii)for cmos logic Y=(A+B+C)whole bar?
• 5)   Explain with suitable examples how to design the layout of a epte to maximum performance and minimize area?
• 6)   Compare the relative merits of three different forms of pull-up for an inverter circuit? What is the best choice  for  realization in nmos and cmos technology?
• 7)   Explain the concept of VLSI design flow and flowchart of VLSIdesign flows & write the domain of VLSI  design flow and Y chart of design flow?
• 8)   What is a stick diagram? Draw the stick diagram and layout for cmos inverter?
• 9)   Derive an expression for transconductance of an n-channel enhancement MOSFET  operating in active region ?
• 10)  Explain about 2micrometer CMOS design rules and discuss with layout examples ?

      

                           UNIT -2

• 11) What is meant by sheet resistance (Rs) ? Explain the concept of Rs applied to the  mos Transistors ?
• 12) What is  inverter delay? How delay is calculated for multiple stages ? Explain ?
• 13)Calculate on resistance of an inverter from Vdd to GND?( Illustrate Problems)
• 14)Explain the issues involved in driving large capacitor loads in VLSI circuit regions ?
• 15)Explain the scaling models & factors for device parameters?
• 16) Explain the limits on logic levels and supply voltage due to noise and current density ?
• 17) Explain the driving large capacitive loads & propagation delays and  of layers ?
• 18)Design a 2-input Ex-OR using CMOS Transmission gate ?
• 19) Discuss about choice of fan-in and fan-out selection in gate level design ?

 

                                 UNIT – 3

• 20)  Explain about regions of operations of MOSFET & modelling of transistor ?
• 21)Explain how MOSFET  acts as a current sources & current sintcs ?
• 22) Explain the operation of common source MOSFET amplifier  with  diode connected load & resistive load ?
• 23) With a neat sketch explain the operation of CS stage  with current source load . Also derive its voltage gain ?
• 24)With a neat sketch describes the operation of common gate amplifier. Also derive its voltage gain ?
• 25) Describe the operation of source follow (common drain). What are the merits and demerits ?
• 26)  What is current mirror ? Explain the general properties of current mirror with block diagram ?
• 27) Explain the operation of single stage amplifier with resistive load ?

 

                              UNIT – 4

• 28) Explain  the concept of complementary cmos gates have static properties ?
• 29) Explain Master-Slove Edge-Triggered register & bistability principle?
• 30) Explain the operation of an SR lacth using NAND gates. Implement it with cmos design ?
• 31)What are the problems occurred in ultra deep submicron(USDM) technology at analog circuit design ? Hoe they overcome ?
• 32) Explain the issuses in dynamic design & cascading  dynamic gates ?
• 33)Write short notes on the issues of capacitive coupling in dynamic design?
• 34) Implement the register of question 8 using cmos logic & explain how 0-0 and 1-1 overlap of clock signal are eliminated ?
• 35) Explain about dynamic power consumption for cmos gate &dissipation due to direct path currents ?
• 36)  Write a short note on i)Ratioed circuits  ii)Dynamic circuits

• 37) Describe pass transistor briefly with examples ?
• 38) Explain the following  i)Static power dissipation  ii) Dynamic power dissipation ?

 

                                     UNIT – 5

• 39)  Explain the FPGA design flow & FPGA architecture ?
• 40)  Explain the FPGA technologies & introduction FPGA families ?
• 41)  Explain the giga scale dilemma ?
• 42 )Explain about short channel effects ?
• 43) Explain (or) Write a short note on a FINFET & TFET ?
• 44)Explain the high -K/ Metal technology ?
• 45) What are FPGAs? Explain the principle and operation/
• 46) List out the important features of Altera Flex 8000FPGA ?