Sankalp Semiconductor Layout Engineer Interview Questions and Answers

Basic aptitude and mcqs on analog and digital electronics

Q1. Introduce yourself ( 2 minutes)
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I am a dedicated Analog Layout Engineer with a strong background in designing and implementing analog circuits.
• I have a Bachelor's degree in Electrical Engineering from XYZ University.

• I have 5 years of experience working in the semiconductor industry, specifically focusing on analog layout design.

• I am proficient in using CAD tools such as Cadence Virtuoso for layout design.

• I have a strong understanding of analog circui...read more
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Q2. Why are semiconductors used in electronics?
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Semiconductors are used in electronics because of their ability to conduct electricity under certain conditions, making them essential for creating electronic devices.
• Semiconductors can be used to control the flow of electricity, allowing for the creation of transistors, diodes, and integrated circuits.

• They have properties that fall between conductors and insulators, making them versatile for various electronic applica...read more
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Q3. What is a diode and how does it work?
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A diode is a semiconductor device that allows current to flow in one direction only.
• A diode has two terminals - an anode and a cathode.

• It works by allowing current to flow from the anode to the cathode when a forward voltage is applied.

• When a reverse voltage is applied, the diode blocks the current flow.

• Diodes are commonly used in rectifiers, voltage regulators, and signal demodulation.

• Examples of diodes include silico...read more
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Q4. Biasing of a diode and it's voltage and current characteristics.
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Biasing of a diode refers to applying a DC voltage across the diode to control its voltage and current characteristics.
• Biasing a diode involves applying a DC voltage across it in order to control its operation.

• Forward biasing occurs when the positive terminal of the voltage source is connected to the anode of the diode.

• Reverse biasing occurs when the negative terminal of the voltage source is connected to the anode of ...read more
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Q5. Fabrication process of a mosfet
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The fabrication process of a MOSFET involves creating the various layers and structures that make up the transistor.
• Start with a silicon wafer as the base material

• Create the gate oxide layer on top of the wafer

• Deposit polysilicon to form the gate electrode

• Implant dopants to create the source and drain regions

• Add metal layers for interconnects

• Perform various lithography and etching steps to define the transistor's featu
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Q6. Working and different regions of operations of the mosfet.
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MOSFET operates in different regions: cutoff, triode, saturation. Each region has specific characteristics.
• Cutoff region: MOSFET is off, no current flows

• Triode region: MOSFET acts as a resistor, linear relationship between Vgs and Id

• Saturation region: MOSFET acts as a current source, Vds is small and Id is relatively constant
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Q1. The interview questions were based on core concepts of EEE and ECE
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Q2. Circuit design questions were asked , rlc questions
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The test was easy to moderate and with more questions on passages

Q1. Series combination of resistor
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In a series combination of resistors, the total resistance is the sum of individual resistances.
• Total resistance is calculated by adding the individual resistances in the series.

• Current remains the same throughout the series combination.

• Voltage is divided among the resistors based on their individual resistances.
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Q2. Equipotential nodes
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