freescale1. Y=A.C+B.C(bar) the gate implementation was given.How can this circuit is implemented by latch?

Ans:- Simple, this is simple 2:1 MUX Where A,B are inputsAnd C is select pin or clock.

In Latch if clock is low its maintain output as its previous stage means no change.So if connect output Y to A. then this is implemented by latch.

2. Set up time, hold time related 1 question.

3. Set up time, hold time was given and some delay in b/wMax freq.=1/(transition delay+setup time) No hold time.

4. NAND circuit was implemented by MOS....Response was asked?

5. Power dissipation=V^2*f*C(load cap)

6. Delay =(1/W by L ratio)*Vth*C(load)

7. Two buffer ckt were given what is the difference b/w them?

8. CMOS inverter main yadi PMOS and NMOS ko interchange ker de to bo buffer bun jata hai.

9. Three ckts of inverter was give in which they asked about power dissipation....with ON time was 40% while off time 60%. A. Simple CMOS inverter. B. Res was connected to VDD and PMOSC. NMOS Connected to VDD and res.So less on ckt was PMOS BECOZ ON TIME WAS 40% SO less power diss compare to C. While in A no res so very less power dissipation.

Paper totally based on digital switching theory and mos operation n/w and elex.

q1.there are xor ckt and gave the wave of i/p with delay find out the delay. plz concentrate some delay in ms some in ns.

q2.thenvines ckt(n/W) find voc and Req.

q3.two question from clock skew.(concept of hold time, setuup time and cq)

q4.find out the output impendence of ckt(gm1 and gm2 are in series with resistance r1 and r2.

q5.find the truth table of combination ckt of pmos and nmos.

q6.sequence dector of 1010101

q7.if clock is given i/p is given in form of 1 0 10 then find waveform of o/p

I give one suggestion only study digital and concept of wave drawing.

In interview mainly ask mos concept.

FREESCALE WRITTEN EXAM AND INTERVIEWS QUESTIONS

1. the 2's complement number of 110010 isans; none of those

2.Truth table of a logic functionans: displays all its input output possibilities

3.The process of varying one signal according to the pattern provided by another signal isans:modulation

4.The octal equivalant of hexa number 123 isans:443

Determine how many times the given loop is executed

5.m=3 while (m<18) do {m=m+2;m=m-1}ans:15

6.m=1;a=30;while (m<>1) do {m=m+1;a=a-1;}

7.m=1;a=30;while (e*m-5<a) do {m=m+1;a=a-2}ans:9

in questions 8 to 12 find the values of a and b at the end of the execution of the programsegment

8.a=2;b=1;x=1;while(x<=4)do {a=a+b;x=x+1}ans:(5,1)

9.a=1;b=2;x=1while (x<=5)do {b=a+b;x=x+1;}ans:(1,6)

10.a=0;b=0;x=1;while (x<=4){a=a+x;b=b-x;x=x+1;}ans:(10,-10)

11.The complexity of bublle sort is0(a),then k equalsans:2

12.In BCD,the decimal number 516 isans:10101110

13. RS 232 is standards forans:physical layer

14. which of the following is not true of a DBMSans:maintain integrity

15.the method of access used for obtaining a record from a tape isans:sequential

16.Whichof the following is an universal gateans:nor

17.an ASCII text file containing 500 characters will have size approximatelyans:500bytes

18.which of the following is a vectorans;force

19.The lowest attainable temperature

ans 0k

20.viscosity is most similar toans:friciton

21.The elapsed time between the submission of the job and getting the output isans:seek time

22.the earliest calculating device still in use isans: abacus

23.Qunatities used to bring fields to standards sixe areans:pixels

24.the base of a number system is called asans:radix

25.An 8kb computer will bave addresses -----ans:8191

26.Arranging data in a specific form is calledans: sorting

27.A translator which reads an entire programme written in a high level language and convertsit into machine language code isans: interpreter

28.a data hierarchy in assending order isans:bit-byte -field-record-file-database

29.a computer generated output that lets programmer follow the executionof the program line by line is

30.data items grouped togother for storage form a

31. the most dangerous aspect of computer virusesis their ability toans: change system memory

32.a distributed data processing configuration in which all activities must pass through ancentrally located computer is called aans: ring network

33.communication circuite that transmit data inboth directions but not at the same timeare operating in

34.which of the following is not an application softwareans:unix

35.For which of the folowing computer application is real time processing not essential

36.a data structure with one to many relationship is aans:tree

37. which of the following hardware components is most important to operation of a databasemanagement systemans:high speed,large capacity disk

38. computer viruses can spread from one system to another by means ofans:all the above

39. afront end processor is ususally used inans: multi processing

40.a radioactive material of mass 16 grms in 10 years due to radiation. how many years will ittake for the material to attain a mass f1 gmans:30

41.a block of ice floats on water in a beaker, as the ice melts,the water level in the beaker willans:remain same

42.if va,vn,vs are velocities of sound in air,water, and steel then,ans:vs>vn>va

43.in usual computer arthemetic, the value of the integer expression22/5*2+8*2/6ans:10

44.an acronym for the organisation that publishes programming langauge standards isans:ANSI

Q1- Design a black box with three ports A,B,C using 5 resistors of 1 ohm each such that RAB=1.5 ohm, RAC=3.5 ohm and RBC=3 ohm.

Q2-It was a basic  thevenin circuit with three parallel branches containing a current source of 2A current, a resistor of 1 ohm and a battery source of 1V.We were asked to calculate the current in the resistor.

Q3-Design a mod-5 counter using JK flip flops with minimum circuitry?

Q4-Sythesize the function Y= (AB+CD)E using CMOS?

Q5-A general aptitude question with two parts each of 5marks.(a)    Related to some matrix(Could not answer that)(b)    Was an easy probability based problem..

Q6-A problem on generating a C-code..Din't attempt it.

Q7-A problem of finding the max frequency with 3 different parts. Each having a different clock skew.

Q8-A problem to calculate the propagation delay in a combinational circuit.

Q9-A tricky problem on Zener diode with an RC circuit...Had to sketch the voltage waveform across the resistor

Q10-Data is coming at a rate of 600mhz and is transmitted at 150mhz.Calculate the size of the FIFO required to avoid the overflow if 200 data bits are coming at a time and no data is received until the previous data is completely transmitted?

Q11-A microprocessor has an instruction pattern such that the first 3 instructions take 1 clock cycle each, the fourth one takes 2 and the fifth one takes 3 clock cycles.   If 1 clock cycle=10ns. Find the MIPS (million instructions per second) of the microprocessor?

Q12-A problem on dynamic power dissipation based on the input & output waveforms of a sequential circuit.

Q13-Input & output waveforms for a circuit were given. Had to design the circuit to satisfy the conditions.

Q14-A very easy opamp based problem to calculate the transfer function of the circuit.

Q15-A unusual problem again on power dissipation. Given the power dissipated in each stage of the amplifier blocks..

1) DESIGN OF MODE -5 COUNTER 2)SERIAL IN SERIAL OUT 1101....SHOW D CKT 3)ONE QUESTION BASED ON J K F/F 4)PROBLEM RELATED TO SETUP AND HOLD TIME 5)IMLEMENT (AB+CD)E WITH CMOS BASED ON NETWOR CKT

1) A BOX GIVEN ,,,IN BOX ONE INPUT A AND TWO OUTPUT B AND C....... WITH HTE USE OF SIX 1OHM RESISTER ,,,WE HVE TO SHOW THE EQIVALENT RESISTANCE BETWEEN A-B 1.2 OHM,,,,B-C-2 OHM,,,, A-C--2.2 OHM,,, 20 ONE QUESTION BASED ON TRANSIENT THEORM OF NETWORK... BASED ON COMMUNICATION BIT N=12,,1/TS=300K,,,FIND THE BANDWITH??? BASED ON ANALOG... OPEMP DB GAIN PROBLEM TECNICAL INTERVIEW..... BASED ON WRITTEN...AND FOCUSED THE PART WHER U DIDN'T PERFORM WELL.... HR ROUND... THEY ALREADY DECEIDED ACCORDING TO TECH WRITTEN AND INTERVIEW.