Freescale Placement-Paper

Discussion in 'Latest Placement papers' started by krishna, Oct 19, 2013.

  1. krishna

    krishna Banned

    FREESCALE PAPER ON 7TH AUGUST

    The paper was of 90 minutes and had 15 questions each of 10marks.

    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..

    SOLUTIONS
    Ans-1:From port A connect two 1 ohm resistors in parallel to point D(say). from point D connect a resistor to port B. And from D connect two restors in series to port C.
    Ans-2: i=1A
    Ans-3: Used 3 JK flip-flops with just one additional gate.
    Ans-4: Used 16 transistors.
    Ans-10: I got 150 bits.
    Ans-11: 63.5 MIPS

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