Carl Zeiss Design Engineer Interview Questions and Answers

Round: Test
Experience: Written test for a duration of 1.5 hours
Test was based on VLSI design

Round: Interview
Experience: Technical and HR round are held together
Digital VLSI - Verilog skills, state machines, setup and hold time issues were tested

General Tips: Some questions in the test are repeated, so it might help to talk to a few people in advance
Questions are mainly related to VLSI mainly-Digital IC design, analog circuits
Skills: Verilog Skills, State Machines, Setup and Hold Times issues
College Name: IIT MADRAS

Round: Test
Experience: Test was subjective and questions were asked from basic analog, digital design, VHDL and VLSI circuits.

Round: Technical Interview
Experience: Had 3 technical interviews each around 25 minutes. They asked me about my summer internship and
questions from microcontroller architecture and its interfacing. Then they asked me the questions
from those problems which I didn't attempt in the written test.
Tips: For electrical students, it might be a bit challenging. I took an elective on Microcontroller in 7th sem which
helped me a lot during the interview. You might want to brush up your concepts of 8085, digital, OPAMPs
and analog

Round: HR Interview
Experience: My family background and my future goals were asked. They asked me about
my internship project and wanted to know what I learnt during the internship. Then I asked a few questions
from them about the company work culture and growth opportunities

College Name: IIT Roorkee

Round: Test
Total Questions: 15

Round: Technical Interview
Experience: Panel discussed questions attempted incorrectly or not attempted. Topics asked separately: RAM, MOSFET, Memory, Interrupts, FIFO etc.Few puzzles were also asked.

General Tips: Topics that should be covered: Digital Electronics, Microprocessors, Basic Electronics, K Map and FSM questions.
Skills:
College Name: BIT MESRA

Round: Test
Experience: Questions were from digital Electronics which included realization of counters using JK FF,Sequence detector,Boolean expression reduction,One shot and drawing waveforms of some digital circuits.Questions were also their from pipelinig,finding out MIPS,power consumption of two processors,Small signal analysis of MOSFETs,Buffer using CMOS ,finding out the type of filter given block diagram(control theory).Questions were easy and required step by step realization.
Tips: Prepare digital Electronics very well as it has 50% weightage in paper. Pipelinig is important. Some basics concepts of CMOS is very necessary.
Duration: 1hr 15 min minute
Total Questions: 12

Round: Technical Interview
Experience: First they asked to introduce yourself.
Then they asked about projects & Internship.
STA,EEPROM,EPROM,DRAM,SRAM,CACHE Memory,Pipelining,DMA was asked in depth.
Difference between clock skew and Jitter.
Asked whether I know any Hardware Languages.
XOR gate using 2:1 MUX.
Gave a waveform,had to realize using DFF and considering the delay.
Tips: Study STA very well.
Questions will be asked in depth from any topic.

Round: HR Interview
Experience: Family Background
Why NXP
Hobbies


Skill Tips: Study Digital Electronics very well
Skills: Analog Electronics, Microprocessor, Vlsi Basics, Digital Circuits
College Name: BIT Mesra

Round: Test
Experience: Questions were from Digital Electronics,Microprocessors and some from CMOS.
50% Digital Electronics.
1 X Output waveform drawing from circuit of FFs & gates
1 X Realize inverter from given two blocks
1 X CMOS implementation of gates
1 X Realize digital circuit for given waveform
1 X MIPS & Pipelining
1 X Processors power Dissipation calculation
1 X Small Signal analysis of CMOS
1 X Compare two given buffers circuits(CMOS)
1 X Transfer function calculation(Control Theory)
1 X Counter using JK FF
1 X Sequence Detector

Tips: Study digital electronics very well.

Duration: 1 hr 45 min minute
Total Questions: 12

Round: Technical Interview
Experience: Indroduction
Projects & Internship
Discussions in DEPTH on:
Pipelining
STA
MIPS
Memory(flash memory,DRAM,SRAM)
CACHE Memory
DMA
Digital circuit realization for given waveform
XOR Gate using 2:1 MUX
Tips: Prepare Digital electronics and Microprocessors very well.Sta is very important.Panel will go deep into the topics to check ur technical knowledge.
TIPS: Be confident and your opinion should be strong.Stand by what you say.Do not get confused.And when panel asks to solve any digital circuits, speak loud what is in your mind and what approach you are using.Be honest.

Round: HR Interview
Experience: Family Background
Why Freescale


Skills: Static Timing Analysis (STA), Memory, CMOS Circuits, Microprocessor, Digital Circuits
College Name: BIT Mesra
Motivation: I had interest in core electronics

Interview preparation tips for other job seekers - Revise Computer Architecture and Verilog for interview process

Interview preparation tips for other job seekers - Prepare well

Interview preparation tips for other job seekers - Good to go, they asked basic question