Cadence Design Systems Analog Design Engineer Interview Questions and Answers

Q1. IV characterstics of CMOS inverter
Ans. 
IV characteristics of CMOS inverter show the relationship between input voltage and output current.
• CMOS inverter has two transistors - NMOS and PMOS connected in series.

• For low input voltage, NMOS is ON and PMOS is OFF, resulting in low output voltage.

• For high input voltage, NMOS is OFF and PMOS is ON, resulting in high output voltage.

• The transition between low and high output voltage occurs at the threshold voltage.

• Th...read more
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Q2. Set up and hold time explain
Ans. 
Set up time and hold time are timing requirements in digital circuits to ensure proper operation.
• Set up time is the minimum time before the clock edge that the input signal must be stable.

• Hold time is the minimum time after the clock edge that the input signal must be maintained stable.

• Violating set up time can lead to incorrect data being latched.

• Violating hold time can lead to metastability issues.

• Examples: In a flip...read more
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C, c++ python and simple aptitude

Q1. MOSFET working & types
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Q2. CMOS inverter and it's working
Ans. 
A CMOS inverter is a type of digital logic gate that switches between high and low voltage levels.
• CMOS stands for Complementary Metal-Oxide-Semiconductor

• It consists of a PMOS (p-type metal-oxide-semiconductor) and NMOS (n-type metal-oxide-semiconductor) transistor connected in series

• When the input is high, the PMOS transistor conducts and the output is low

• When the input is low, the NMOS transistor conducts and the outp...read more
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Q1. Behavioral question & hr question
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Q2. Hr discussion & salary discussion
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Basic aptitude questions

Q1. Tech questions related to domain
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Q1. Genenral questions that are non technical
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Q1. What is aspect ratio?
Ans. 
Aspect ratio is the ratio of an object's width to its height.
• Aspect ratio is commonly used in design and engineering to maintain proportionality.

• It is often expressed as a ratio, such as 16:9 for a widescreen TV.

• Aspect ratio can affect the visual perception and usability of a product.

• It is important to consider aspect ratio when designing graphics or layouts for different devices or mediums.
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Q2. How do you decide stackup?
Ans. 
Stackup is decided based on the number of layers, signal integrity requirements, and manufacturing constraints.
• Consider the number of layers required for the design

• Evaluate signal integrity requirements and impedance control

• Take into account manufacturing constraints such as minimum trace width and spacing

• Balance cost and performance

• Use simulation tools to optimize the stackup

• Consult with PCB fabricators for their reco...read more
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Q1. Introduction about ourselves
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Q1. Personal interview ( personality test )
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