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Get interview-ready with 220+ Analog VLSI interview questions

Op-amps, differential amplifiers, CMRR, and current mirrors — the analog design fundamentals behind mixed-signal interviews.

ANALOG VLSI INTERVIEW QUESTIONS EBOOK

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Analog VLSI interviews test circuit-level intuition — how amplifiers actually behave, where noise comes from, and how references stay stable across temperature and process variation.

This bank covers the core building blocks that show up across analog and mixed-signal design interviews, from op-amps to data converters.

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Analog VLSI interview questions by subtopic

Op-Amp Fundamentals

The workhorse of analog design.

  • What are the ideal characteristics of an operational amplifier?
  • What's the difference between open-loop and closed-loop gain in an op-amp circuit?

Differential Amplifiers

Amplifying signal while rejecting common-mode noise.

  • How does a differential amplifier reject common-mode signals?
  • What is the tail current source used for in a differential pair?

Current Mirrors

Replicating and scaling bias currents.

  • How does a basic current mirror work, and what limits its accuracy?
  • What's the difference between a simple and a cascode current mirror?

Noise & CMRR

Understanding and minimizing unwanted signal.

  • What is CMRR, and why is a high value desirable in amplifier design?
  • What are the main sources of noise in analog circuits (thermal, flicker, shot)?

Bandgap References

Generating a stable voltage reference across temperature.

  • What is a bandgap reference circuit, and why is it used instead of a simple resistive divider?
  • How does a bandgap reference achieve temperature independence?

ADC/DAC Basics

Bridging the analog and digital domains.

  • What's the difference between a SAR ADC and a flash ADC in terms of speed and complexity?
  • What is quantization error, and how does it relate to ADC resolution?

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